In general, hemiplegia is a type of unilateral cerebral palsy that causes paralysis or spasticity on only one side of the body. It’s due to an injury to the spinal cord or the brain. The common signs of hemiplegia are poor muscle control, muscle stiffness, and weakness.
In wheelchairs, individuals with CP hemiplegia sometimes punt with a foot or propel with one hand. Building on their efficiency is important. With foot punting, the floor to seat height is critical. Keeping the wheelchair frame width close to the users body helps with efficiency. Reduce seat dump. A power wheelchair with the controls set on the dominant side can help to preserve a mid-line posture. Some seat dump may be used for those who foot punt to reduce the forward migration of the pelvis into posterior pelvic tilt. Sometimes a trunk lateral support on the weaker side can help with stability.
Spastic diplegia (or diparesis) is a subtype of spastic cerebral palsy in which the legs are the most affected limbs. People with spastic diplegia often have a “scissor walk,” characterized by the knees turning inward/crossing. This is due to tightness in the hip and leg muscles.
In wheelchairs, individuals with CP diplegia will often require a medial thigh support to help separate the knees. The user may also present with an anterior tilted pelvis requiring the backrest to be positioned more upright (closer to 90˚ hip angle).
Quadriplegia is the most severe form of cerebral palsy because it affects so many areas of the body. Children with spastic quadriplegia cerebral palsy usually cannot walk, and they are more likely to have multiple associated conditions, like speech difficulties or seizures.
While individuals with CP quadriplegia vary in severity & presentation, normally they would need a lot of support & asymmetrical contouring to adapt to their body shape. Some components may be used to correct while others are used to accommodate the user’s tone. Check for dominant side for vision & hearing as this may dictate the sitting position. Also, some users when in power chairs, can change their sitting position to drive. it is critical to test the user statically & when driving for a complete overview.
Dyskinetic or athetoid cerebral palsy is a subtype of cerebral palsy that is caused by a brain injury that occurs during late pregnancy or the early birth period. Dyskinetic cerebral palsy is marked by abnormal posturing, tone, and involuntary movements.
Individuals with Athetoid CP may prefer added support & have their arms & feet strapped to control unwanted involuntary movements. When using a head control diving facility it is critical to stabilize the body & limbs in view of more fine motor control.
Kids with ataxic cerebral palsy have trouble with balance and coordination. They may walk with their legs farther apart than other kids and have a hard time with activities that use small hand movements, like writing.
Severe cases of ataxic CP are often not able to walk independantly & require a wheelchair or mobility aid. Keeping the wheelchair lightweight & well fitting can help maximize the ability of the user. The seating may require some adaptability to conform to the user or help correct posture.
Floppy muscles resulting in issues with voluntary movement
Individuals with low underlying muscle tone (Hypotonia) often have difficulty maintaining an upright posture & head control.
An ischaemic stroke happens when a blockage cuts off the blood supply to part of your brain, killing brain cells. Damage to brain cells can affect how the body works. It can also change how you think and feel.Stroke that occurs on the left side of the brain leads to neurological impairment on the right side of the body. Studies have indicated left-sided stroke may be more easily recognized than right-sided stroke. Left-sided strokes might be referred more frequently because they lead to clear symptoms, such as aphasia, whereas right-sided strokes may lead to less explicit symptoms, such as hemineglect or spatial disorientation.
Depending on the level of severity a stroke patient may have partial paralysis, often down one side presenting similar to hemiplegia (see hemiplegia). Less mobile patients may use a powerchair & require pressure management & a wheelchair with tilt to relieve pressure. Giving the head some lateral support may help with head control. Maintain postural alignment & an upright posture with supports.
What is transient ischemic attack (TIA)? A transient ischemic attack (TIA) is a stroke that lasts only a few minutes. It occurs when the blood supply to part of the brain is briefly interrupted. TIA symptoms, which usually occur suddenly, are similar to those of stroke but do not last as long.
Multiple sclerosis (MS) is a condition that can affect the brain and spinal cord, causing a wide range of potential symptoms, including problems with vision, arm or leg movement, sensation or balance. It’s a lifelong condition that can sometimes cause serious disability, although it can occasionally be mild. Deconditioning of muscles results from lack of use. Often in MS, due to fatigue, pain, imbalance, or other symptoms, a person’s overall activity level is reduced. Lack of activity will cause muscles to become weak. For this type of weakness, progressive resistive exercise with weights can be very effective. People suffering from spasticity associated with MS may also present with Hypertonicity (increased muscle tone), which can lead to muscle stiffness, rigid joints and bladder dysfunction.
Comfortable seating with good pressure management should be considered with Multiple Sclerosis. Lateral Trunk contouring can be helpful to keep the user in the midline position. Neutral seat dump & knee separation with good medial thigh contouring can aid with maintaining the pelvis & a better spinal posture.
Duchenne muscular dystrophy is a genetic disorder characterized by the progressive loss of muscle. It is a multi-systemic condition, affecting many parts of the body, which results in deterioration of the skeletal, heart, and lung muscles. Duchenne is caused by a change in the dystrophin gene. DMD is the most common childhood onset form of muscular dystrophy and affects males almost exclusively. The birth prevalence is estimated to be 1 in every 3,500 live male births. Age of onset is usually between 3 and 5 years of age.
The future needs to be considered With Muscular Dystrophy as the user will progressively become weaker requiring more external support. Initially the user may have a self propelling chair then as the condition deteriorates, move towards a powerchair.a In the ambulatory phase the user may develop an anterior pelvic tilt to compensate the developing weakness which may need to be considered in the wheelchair seat in terms of back support & Pelvic positioning. Comfort & pressure management are essential as well as support. Gel is a good consideration they attempt to replace th consistency & support of atrophied muscle tissue creating a firm surface than foam.
Becker muscular dystrophy (BMD) is an X-linked recessive disorder due to mutation in the dystrophin gene that results in progressive muscle degeneration and proximal muscle weakness. This condition is less common and less severe than Duchenne muscular dystrophy (DMD).
Facioscapulohumeral muscular dystrophy (FSHD) is characterized by progressive muscle weakness involving the face, scapular stabilizers, upper arm, lower leg (peroneal muscles), and hip girdle [Wang & Tawil 2016]. Asymmetry of facial, limb, and shoulder weakness is common [Kilmer et al 1995]. Over time, muscle weakness decreases mobility, making everyday tasks difficult.
Myotonic dystrophy is a genetic condition that causes progressive muscle weakness and wasting. Myotonic dystrophy can affect muscles of movement and often affects the electrical conduction system of the heart, breathing and swallowing muscles, bowels, lens of the eye and brain. People with this disorder often have prolonged muscle contractions (myotonia) and are not able to relax certain muscles after use.
Monoplegia is a type of paralysis that impacts one limb, such as an arm or leg on one side of your body. This happens when damage to a part of the nervous system disrupts nerve signaling to the muscles in the affected limb. Monoplegia can affect the upper or lower body, either one arm or one leg.
See Hemiplegia
Hemiplegia is one-sided muscle paralysis or weakness. It’s usually a symptom of a brain-related issue or condition. It can affect the face, arm and leg, and sometimes it affects all three.
In wheelchairs, these users sometimes punt with a foot or propel with one hand. Building on their efficiency is important. With foot punting, the floor to seat height is critical. Keeping the wheelchair frame width close to the users body helps with efficiency. Reduce seat dump. A power wheelchair with the controls set on the dominant side can help to preserve a mid-line posture. Some seat dump may be used for those who foot punt to reduce the forward migration of the pelvis into posterior pelvic tilt. Sometimes a trunk lateral support on the weaker side can help with stability.
Paraplegia is a term used to describe the inability to voluntarily move the lower parts of the body. The areas of impaired mobility usually include the toes, feet, legs, and may or may not include the abdomen. Picture: A person with a complete T12 level of injury is paralyzed from the waist down.
Due to reduced muscle tone, atrophied muscle & reduced sensation with paralysis, it is essential to provide a high degree of pressure management. Seating which enables easy transfers & which provides stability to the pelvis & trunk to maximize efficiency.
Quadriplegia is a symptom of paralysis that affects all a person’s limbs and body from the neck down. The most common cause of quadriplegia is an injury to the spinal cord in your neck, but it can also happen with medical conditions.
Due to reduced muscle tone, atrophied muscle & reduced sensation with paralysis, it is essential to provide a high degree of pressure management. Quadriplegics often use powerchairs & require more lateral support & stability
A meningocele is a sac that pushes through the gap in the spine.
Spinabifida users are often active & desire independence. A special setup of the cushion & backrest to accommodate/correct an asymmetrical body shape or posture may be required. With paralysis, a pressure management cushion should be considered as well as ability to transfer.
Myelomeningocele is the most severe form of spina bifida. A portion of the spinal cord or nerves are exposed in a sac through an opening in the spine that may or may not be covered by the meninges. The opening can be closed surgically while the baby is in utero or shortly after the baby is born. Myelomeningocele can cause symptoms that include: Problems moving parts of the body below the opening in the back. Lack of sensation in their legs and feet. Poor or no bowel and bladder control.
Angelman syndrome is a genetic disorder. It causes delayed development, problems with speech and balance, intellectual disability, and, sometimes, seizures. People with Angelman syndrome often smile and laugh frequently, and have happy, excitable personalities.
Angleman Sydrome users may present with scoliosis & have hyperactive lower extremity deep tendon reflexes. Support may be required to prevent deterioration of a scoliosis & a slightly open hip angle may help with constipation.
Friedreich ataxia (FA) is a rare inherited disease that causes progressive damage to your nervous system and movement problems. Nerve fibers in your spinal cord and peripheral nerves degenerate, becoming thinner.
Pressure management for muscle atrophy, maximizing efficiency & external support to prevent scoliosis should be considered with Friedreich’s Ataxia as well as consideration for self transfers.
Osteogenesis imperfecta (OI) is a genetic or heritable disease in which bones fracture (break) easily, often with no obvious cause or minimal injury. OI is also known as brittle bone disease, and the symptoms can range from mild with only a few fractures to severe with many medical complications.
Osteogenesis imperfecta wheelchair users may either self propel or use a powerchair. Care must be taken with seating supports to prevent fractures. Often the user may self transfer to & from the wheelchair so the ability to lower the wheelchair seat may help. External lateral supports can help to reduce the risk of scoliosis.
Winchester syndrome is characterized most frequently by short stature, wearing down of bone and tissue, dark skin patches, and coarse facial features. The main feature of this syndrome is short stature due to changes in the vertebrae of the backbone and long bones of the limbs that get worse over time (degenerative). It has been reported that several affected individuals have lived to middle age; however, the disease is progressive and mobility will become limited towards the end of life.
Winchester syndrome often includes progressive painful arthropathy affecting many joints. Bones become brittle & prone to fracture. Consider comfortable seating which can conform to the asymmetrical shape of the user.
McCune-Albright syndrome is a genetic condition that affects bone growth, skin pigmentation and the body’s hormone balance. Bone abnormalities such as easily broken bones, and premature sexual maturity are typical signs of the condition. Symptoms range in severity. It’s important to keep in mind that MAS/FD is extremely variable with a wide spectrum of involvement (some children with MAS/FD go through life with very few medical issues while others have very serious medical complications).
A wheelchair can make mobility easier for some with McCun-Albright syndrome (MAS). Some may experience a high degree of deformity requiring asymmetrically adaptable seating. Bones can break easily so care must be taken when transferring in & out of the wheelchair. Supporting & maintaining psture with softer surfaces may help to minimize bone pain.
Ataxia-Telangiectasia is a rare inherited disorder that affects the nervous system, immune system, and other body systems. This disorder is characterized by progressive difficulty with coordinating movements (ataxia) beginning in early childhood, usually before age 5. The movement problems typically cause people to require wheelchair assistance by adolescence.
People with Ataxia-telangiectasia may initially use a self-propelling wheelchair but as it progresses a powerchair may be required. Support is needed to maintain a mid-line posture & maximize fine motor function. As the atrophy progesses in the muscles cushions with pressure management need to be considered.
Leukodystrophies are a group of rare, genetic disorders that affect the white matter of the brain. The word leukodystrophy comes from leuko, which means white, and dystrophy, which means imperfect growth. Leukodystrophies are characterized by this abnormal growth of white matter in the brain. Most children within the infantile form die by age 5. Symptoms of the juvenile form progress with death occurring 10 to 20 years following onset. People affected by the adult form typically die within six to 14 years following onset of symptoms. Progressive loss may appear in muscle tone, balance and mobility.
Increasing postural support in the wheelchair may be needed to maximize fine motor function & overtime the pressure management needs to be considered for reduced muscle tone.
Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus. The virus spreads from person to person and can infect a person’s spinal cord, causing paralysis (can’t move parts of the body). Most often, polio survivors start to experience gradual weakening in muscles that were previously affected by the polio infection. Some people may have minor symptoms while others develop visible muscle weakness and atrophy (wasting away).
With polio, like paralysis, maintaining a mid-line posture can reduce the chances of developing asymmetries. If a scoliosis has developed a backrest in which the contours can adapted to the asymmetrical bodyshape of the user may be used. With muscle atrophy, a cushion which can reduce localized pressure can be appropriate.
Related Pages. Arthritis means inflammation or swelling of one or more joints. It describes more than 100 conditions that affect the joints, tissues around the joint, and other connective tissues. Specific symptoms vary depending on the type of arthritis, but usually include joint pain and stiffness.
With Spinal Arthritis, maintaining an upright sitting posture with good spinal extension can help to reduce the pain & is the easiest posture to maintain for longer periods. When collapse or a slumped posture is allowed pain can be worse & transferring to & from the wheelchair may be difficult.
Ankylosing spondylitis is a type of arthritis that causes inflammation in the joints and ligaments of the spine. It may also affect peripheral joints like the knees, ankles, and hips. Normally, the joints and ligaments in the spine help us move and bend.
Cerebrovascular disease refers to a group of conditions that affect blood flow and the blood vessels in the brain. Problems with blood flow may occur from blood vessels narrowing (stenosis), clot formation (thrombosis), artery blockage (embolism), or blood vessel rupture (hemorrhage).
See Stroke
Parkinson’s disease is a brain disorder that causes unintended or uncontrollable movements, such as shaking, stiffness, and difficulty with balance and coordination. Symptoms usually begin gradually and worsen over time. As the disease progresses, people may have difficulty walking and talking.
With Parkinsons, it is good to have a low seat to floor height which enables self-propulsion and lowers the risk of falls. Sometimes individuals may need a powerchair if symptoms limit ability to propel.
ALS is a type of motor neuron disease. As motor neurons degenerate and die, they stop sending messages to the muscles, which causes the muscles to weaken, start to twitch (fasciculations), and waste away (atrophy). Eventually, the brain loses its ability to initiate and control voluntary movements.
Many people with ALS spend most of their time in their wheelchairs, so the chairs must be comfortable and facilitate good health & promote good posture.
Motor neurone disease (MND) is the name for a group of diseases. These diseases affect nerves known as motor nerves, or motor neurons. In MND, these neurons degenerate and die. This causes the muscles to become weaker and weaker. This eventually leads to paralysis.
There are two types of manual wheelchair that are used to meet the needs of people with MND when they are beginning to have mobility problems. One is a folding, portable wheelchair, with self-propelling or attendant wheels, and the other offers more support with a tilt-in-space mechanism. for others a powerchair may be required with attendant controls. A wheelchair for someone with MND should meet their current and future needs as the condition progresses. This will usually mean selecting a high specification wheelchair with a range of functions and postural supports. Initially some of these functions and supports may not be fully used, but over the course of disease progression they often become essential for the continued use of the wheelchair. Pressure management cushions and increased support together with tilt, recline & elevating leg functions are often used as the postural & functional needs change.
With diabetes, your body doesn’t make enough insulin or can’t use it as well as it should. When there isn’t enough insulin or cells stop responding to insulin, too much blood sugar stays in your bloodstream. Over time, that can cause serious health problems, such as heart disease, vision loss, and kidney disease.
As diabetes progresses, many people find mobility aids to be useful. Diabetes affects millions of people worldwide and can cause fatigue and other issues that can be solved with the proper wheelchair. The most frequently mentioned wheelchair adjustments are related to neuropathies, skin integrity, decreased strength and amputations.
Progressive supranuclear palsy (PSP) is a rare neurological disorder that affects body movements, walking and balance, and eye movements. PSP is caused by damage to nerve cells in areas of the brain that control thinking and body movements. Clinical deficits in PSP are numerous, involve the entire neuraxis, and present as several discrete phenotypes. They center on rigidity, bradykinesia, postural instability, gait freezing, supranuclear ocular motor impairment, dysarthria, dysphagia, incontinence, sleep disorders, frontal cognitive dysfunction, and a variety of behavioral changes.
Comfortable presure relieving cushion is often prescribed to reduce the risk of pressure injury developing. Contoured Support is also important to maintain good postural alignment countering the postural instability. The seating may need to be adjustable to adapt to the asymmetrical postural needs of the individual.
Dejerine-Sottas syndrome (DSS) is an inherited neurological condition that gradually affects the ability to move. Peripheral nerves are the nerves outside of the brain and spinal cord. These nerves become enlarged or thickened leading to muscle weakness. It is generally presumed that clinical course is severe, leading to wheelchair dependency at an early age.
With, Dejerine-Sottas disease, like other progressive conditions, pressure management cushions & increased postural support are important & may need increasing as the disease progresses.
Morquio syndrome is a rare genetic condition that affects a child’s bones and spine, organs, and physical abilities. Children with this condition are missing or don’t produce enough of the enzymes that break down sugar chains naturally produced in the body. Short stature, with a very short torso. Abnormal bone and spine development, including severe scoliosis. Bell-shaped chest with ribs flared out at the bottom. The outlook for a person with Morquio syndrome can depend on the severity of their symptoms. Evidence suggests that people with severe symptoms may only live until late childhood or adolescence. People with milder symptoms generally live into adulthood. However, their life expectancy may be lower.
Children with spine and bone conditions can have difficulty walking and may require a wheelchair. Seating which can conform to the individual’s body shape are important due to the high risk of scoliosis & abnormal bone & spine development.
Pelizaeus-Merzbacher disease (PMD) is a rare, progressive, and degenerative central nervous system disorder that deteriorates coordination, motor abilities, and cognitive function. atients with classic Pelizaeus-Merzbacher disease (such as that caused by PLP1 gene duplications) can live into the fifth or sixth decade of life. Patients with a predominantly spastic paraplegia phenotype have a normal life span.
Pelizaeus–Merzbacher disease may include the need for wheelchair seating, physical therapy, and orthotics to prevent or ameliorate the effects of scoliosis; special education; and assistive communication devices. Adaptable seating which can be adjusted to suit the changing needs of the individual.
Sandhoff disease is a rare, inherited disease that progressively destroys nerve cells in the brain and spinal cord. It occurs when fatty materials called lipids accumulate in brain cells (and in other parts of the body), forcing them to malfunction and die. Characteristic features include speech difficulties, loss of cognitive function (dementia), seizures, and loss of muscle coordination (ataxia). Adult Sandhoff disease is characterized by problems with movement and psychiatric problems.
Like all progressive diseases, with Sandhoff’s disease, the wheelchair must meet current and future needs as the disease progresses.
Krabbe disease is a rare, inherited metabolic disorder in which harmful amounts of lipids (fatty materials such as oils and waxes) build up in various cells and tissues in the body and destroy brain cells. Krabbe disease is a progressive disease, meaning that the disease gets worse, and the child loses the ability to move, see, hear, and eat. Eventually they lose their ability to breathe, which results in death. When symptoms appear early in life, the disease is more severe and progresses much more rapidly. The symptoms of
Krabbe disease are different depending on the age symptoms begin. In general, the following symptoms are seen in the majority of patients; poor coordination, difficulty moving & muscle tone changes (muscles become stiff), vision & hearing loss, mental & physical development slow-down, breathing difficulties, reflu, vomiting, constipation & difficulty with chewing & swallowing.
With Krabbe’s disease, where there is severe spasticity & muscle weakness a wheelchair or stoller may be needed. The seat must be adjustable to the current & future needs of the individual.
Epilepsy is a disorder of the brain characterized by repeated seizures. A seizure is usually defined as a sudden alteration of behavior due to a temporary change in the electrical functioning of the brain. Normally, the brain continuously generates tiny electrical impulses in an orderly pattern.
Where there are seizures, ensure the head is supported, & if in a tilting wheelchair, use some tilt to prevent falls as well as a seat belt. Sometimes a dynamic backrest is useful as it can reduce the strain on the individual & wheelchair then return to its position afterwards.
What is a seizure? Seizures are caused by rapid and uncoordinated electrical firing in the brain. This can cause temporary abnormalities in behaviours, movements (such as alternating stiffening and jerking of the arms and legs), sensations or a loss of consciousness or altered consciousness level.
A person who has had a limb amputated.
With leg amputee’s, the seating approach can depend on where the amputation is. When in lower extremities, if it is close to the knee or above the knee consideration needs to be given to the cushion & its ability place the leg in the best position for balance & comfort. The centre of gravity of the chair will also be affected. With below knee amputations, a separate amputee pad may be clamped onto the wheelchair legrest. pressure care must be considered due to the increased weight loading under the torso. With upper extremity apmutation, a powerchair may be essential & support added to prevent postural deformities.
Pelvic obliquity is the misalignment of the pelvis, typically where one hip is higher than the other. This condition can lead to abnormal postures due to the spine compressing and becoming misaligned to compensate for any misalignment.
For people with flexible pelvic obliquity, the seat cushion can also play a key role in correcting or accommodating their postural abnormality. If the obliquity is flexible, a wedge is placed under the seat on the low side to level the pelvis. When the Pelvis presents as fixed, we have to be careful we don’t increase the pelvic obliquity. Maybe, a build up under the high side to accommodate & distribute pressure, but not to the level of the obliquity so there is ability to reduce it over time. Fixed pelvic obliquity doesnt mean it can’t get worse. Also find the core reason for the pelvic obliquity, is hip pain or subluxation the cause? – These may need to be addressed first.
A pelvic rotation is when an individual presents with one hip further forward in the seat, with one anterior superior iliac spine more forward than the other. This can arise from how an individual sleeps (side lying), dominant side compensatory postures, through to daily activities such as operating a powerchair.
With pelvic rotation, check to see if there is an unaccommodated leg length discrepancy & if there is unaccommodated assymetry in the individual’s trunk. Sometimes accommodating more windsweeping can reduce the muscle tone, reduce pelvic rotation & enable a more upright sitting posture.
Posterior pelvic tilt is a condition in which the front of the pelvis rises and the back of the pelvis drops, while the pelvis rotates upwards.
Posterior pelvic Tilt is the most common tendency in wheelchair seating & mostly the cause of the forward migration of the pelvis.
Anterior Pelvic tilt is the opposte of Posterior pelvic tilt, the pelvis tilts forward. Tightening or inbalance of the hip flexor muscles to the weakening of the hamstring muscles & tightening of the sacrospinalis muscles. For wheelchair users, sometimes Anterior Pelvic Tilt develops during the ambulatory stage as a compensatory posture to increase stability & movement or it may arise from instability in the wheelchair seat.
Sometimes mild anterior tilt of the pelvis is encouraged as it can help to distribute weight through the ischial region & reduce some asymmetries in the spine such as kyphosis but it also can be the root of substantial lordosis in the spine. Keeping the backrest upright to make better contact with the individual and contouring to allow excess fleshy tissue to protrude below the backrest may help. A mild (5 deg.) degree of seat dump could be tried to reduce the tone.
Tight hamstrings in seating, reduce the ability of the femur to achieve a 90 deg. angle in relation to the back.
Unaccommodated tight hamstrings in seating (often acompanied by shortened PSOAS muscles) can pull the pelvis into posterior pelvic. Check the seat depth (too long can increase posterior pelvic migration) & ensure the lower leg can move back sufficiently to relieve the hamstring tension.With windswept postures, accommodating more lateral migration in the seating can reduce the tension on the hamstrings.
Internal rotation of the femur occurs any time you move your thigh bone inward. When the activating muscles involved become shortened, it can lead to more severe inward rotation. Severe internal Fermural rotation can lead to subluxation of the hip, & stress on the knees & ankles.
Internal femural rotation, when severe, can cause hip pain or even the hips to become subluxed. Good medial thigh contouring can help reduce the muscle tone.
External rotation of the hip is when the thigh and knee rotate outward, away from the body. An excessive femoral retroversion can place stress on hip and knee joints, often leading to joint pain and abnormal wear.
With paralysis the femurs often externally rotate and may need hip guides to keep in alignment. When there is increased spasticity such as CP with windsweeping it can be very painful to try to correct this posture. In these cases going with the body at the beginning, then gradually over time decreasing the level of external rotation may be effective.
Femoral-on-pelvic hip adduction occurs as the femur moves toward, or across, the midline relative to a fixed pelvis. Often found in conjunction with external femural rotation.
See external femural rotation.
Hip abduction is the movement of the leg away from the midline of the body. Often found in conjunction with internal fmural rotation.
See internal femural rotation.
Extension thrust is the extending of the legs. With spastic quadriplegia, persons can show global pattern of extension. During our seating assessments of many “high needs” users we found that EXTENSION THRUST can apply both to clients with overall High tone or Low tone but mostly was caused by only two reasons:
Discomfort – Most importantly & commonly we found that tightened hamstrings combined with seating which incorporated a traditional style high pre-ischial shelf was the cause of great discomfort to the user. It seemed counter-intuitive, but enabling the leg or legs to be positioned lower to relieve the hamstring muscles combined with allowing the feet to move back on the footplate or using 90 degree legrest hangers, the clients sat for much longer periods without extending out of the seat or showing signs of discomfort. Sometimes repositioning the legs laterally to accommodate tightened abductor muscles or adductor muscles e.g. windswept postures, greatly aided in the comfort to the user for long term sitting. Undiscovered hip subluxation or dislocation also causes a lot of pain & discomfort to the user & the client often will extend or twist in their seating to relieve the pain. Reducing any pressure in this area & reducing the tension on the hip belt can quickly help the client to relax.
Mood – We all have bad days where we want to vent our feelings & frustrations. As these feelings go well beyond how they feel about their seat, this type of extension thrust will not be fixed by well configured & comfortable seating although good postural seating may reduce the frustrations making the client happier overall.
Firstly, check the occupant can tolerate the angles of the seating system (these may need to be opened or closed to reduce the effect of the muscle tone). Secondly, check for discomfort – pain from a joint, muscle or fleshy tissue can cause the individual to extend.
Flexion is the most common knee deformity in patients with cerebral palsy and frequently occurs in ambulatory children. lexion at the hip (which causes the leg to lift upwards when lying or the body to lean forwards in standing) Flexion at the knees (causing changes in a person’s standing posture).
Regular monitoring of a user’s range of movement can help to identify flexion contractures at an early stage. Knee flexor contractures may require the footplates to be moved rearwards to accommodate the contracture. Another option may be to reduce the cushion depth to enable the lower leg to move backwards. Tightening of the PSOA muscles may increase posterior pelvic tilt & some accommodation in the backrest may be required if the posture is fixed.
Hypertonia is a condition in which there is too much muscle tone. For instance, arms or legs are stiff and hard to move. Muscle tone is controlled by signals that travel from the brain to the nerves and tell the muscle to contract.
Correction of postures caused by high general tone needs to be undertaken very slowly over a period of time & also in conjunction with other therapies such as physiotherapy, swimming & night-time positioning.
Low muscle tone is used to describe muscles that are floppy. It is also referred to as hypotonia. Individuals with low muscle tone may have increased flexibility, poor posture and get tired easily.
Spinal extension & head control are common challanges with underlying low tone. A neutral seat dump (no tilting of the seat base), keeping the backrest more upright (closer to 95 deg.) with a sacral support which allows the scapulars to fall slightly behind the pelvis, stabilizing the spine laterally with external trunk lateral supports, then working on head position. Preventing lateral slippage of the head position can reduce the tendancy of the head to fall forwards. Position the upper arms in line with the trunk as these will also help to stabilize the trunk & head.
Ataxia describes poor muscle control that causes clumsy voluntary movements. It may cause difficulty with walking and balance, hand coordination, speech and swallowing, and eye movements.
Fine tuning to make the wheelchair as efficient for the user as possible, such as wheel height & position, joystick position. A stable base with close support can help to stabilize the individual. Sometimes individuals may benefit from strapping the limbs as this reduces unwanted movement enabling them to conenctrate their effort on the task at hand.
The asymmetrical tonic neck reflex (ATNR) is a primitive reflex found in newborn humans that normally vanishes around 6 months of age. Prolonged ATNR can be associated with developmental delays. It becomes hard for them to cross the midline of their bodies, for example, and they can’t handle objects with both hands. In other instances, the child can’t identify which hand or leg to use, causing him to hesitate in movements.
Kyphosis is an exaggerated, forward rounding of the upper back. In older people, kyphosis is often due to weakness in the spinal bones that causes them to compress or crack. Other types of kyphosis can appear in infants or teens due to malformation of the spine or wedging of the spinal bones over time.
Kyphosis often stems from poor pelvic position & tightening of the hamstrings. First neutralise any seat dump (seat base angle) then conentrate on the pelvic & leg, knees feet position (the foot position can be influential in spinal extension) before attempting the backrest. In the backrest, provide a good sacral block & support under the apex of the kyphosis with adaptable support. The headrest may need to be brought forwards to meet the head to reduce the risk of a lordosis at the neck. Somtimes there is the added challange of the tendancy to fall forward in the seat. Forearm position is critical to spinal etension & head control. Keep the arms positioned beside the trunk (not too forward or too rearward as this can reduce the stability to the trunk). A hip belt & shoulder harness or chest strap can be beneifical to encourage an upright posture.
A curving inward of the lower back. Some lordosis is normal. Too much is referred to as sway-back. It may be inherited or caused by conditions such as arthritis, muscular dystrophy and dwarfism. Some lordosis is normal. Too much is referred to as sway-back. It may be inherited or caused by conditions such as arthritis, muscular dystrophy and dwarfism. Lordosis causes an unusually large, inward arch on the lower back, just above the buttocks. The condition may cause lower back pain.
Lordosis of the spine is often accompanied with an anterior tilted pelvis. Position the pelvis first, then stabilize it with the legs, knees & feet before working on the backrest. Check for back pain or insecurity in individual as lordosis can sometimes be a compensatory posture for those. Bring the backrest forward to meet the individuals back (it may need to be more upright to reduce the effect of the Lordosis).
Scoliosis is a lateral curvature of the spine. Everyone has normal curves in the spine, and when looked at from behind, the spine appears straight. However, children and teens with scoliosis have an abnormal sideways S-shaped or C-shaped curve of the spine.
Overall support starts from a well positioned pelvis. Then supporting the back where gravity can have the least affect. Due to shortening it may not be possible to reduce a scoliosis but maintain the posture with a backrest which can adapt & support asymmetrical postures and install lateral supports (these may need to be off-set from each other in height to best prop the ribcage). Sometimes tilting the lateral pad is beneficial to support the inside curvature of the trunk and increase the surface contact area.
Instability & fear of falling in a wheelchair can adversely impact posture.
Where ther is instability or fear of falling from the wheelchair, lower the seat to floor height, widen the base of support & tighten loose supports to increase the feeling of security to the individual. Increasing the contouring around the user can help with a feeling of stability.
Your Rib-Hip Connection is the distance between your ribcage and your pelvis, or from your lower ribs to your hip bones. Under normal conditions, there is no iliocostal contact due to enough distance between the lower ribs and the iliac crest.
Check the pelvis is positioned well & support by the lower leg, knees & feet. Check there is no hip or pelvic pain on the high side of the pelvic obliquity, as this can be sometimes cause of lefting the hip off the seat. Close lateral support is needed to open the ribcage on the tightened side (this must only be done in conjunction with other physiotherapy such as stretches). Tilting lateral pads may be beneficial to support on the underside of the internal curvature.
A subluxation is an incomplete or partial dislocation of a joint or organ. Dislocation is when the bones in a joint are pushed out of their normal place. Individuals who have been in a wheelchair most of their lives may not have fully developed hip sockest due to the lack of load & movement on the joint, hence with increased muscle tone, the chances of subluxation or dislocation are higher.
Sublxation & dislocation can be very painful & often can cause compensatory sitting postures. It is best practice to address these issues first with pysiotherapy or surgery before attempting to adjust the seating.
Spinal fusion is surgery to connect two or more bones in any part of the spine. Connecting them prevents movement between them. Preventing movement helps to prevent pain. During spinal fusion, a surgeon places bone or a bonelike material in the space between two spinal bones. This is done to eliminate painful motion or to restore stability to the spine.
It is generally recommended to wait until after surgery before attempting to seat an individual who is waiting for spinal surgery. Often the result of the surgery will straighten the back & in turn lengthen the trunk. Asymmetrical contouring may be required to be reduced or placed at a different position in the back than before surgery.
Spasticity is a form of hypertonia, or increased muscle tone. This results in stiff muscles which can make movement difficult or even impossible. The Flexor & Extensor muscles become unbalanced.
When there is increased spasticity the risk of abnormal asymmetries to the body structure increase due to unbalanced muscle groups. Therapy programmes should be considered including stretches, exercises for coordination & flexibility, swimming and sleep positioning systems.
Near drowning occurs when water enters your lungs and you stop breathing. Your brain does not get the oxygen it needs, and major organ systems may begin to shut down.
The more severe the case due to hypoxia, the more difficult these patients are to seat. The patient may present with rigid muscles & require constant breathing aids & sometimes cooling aids. Some of these individuals can be very difficult to seat in an upright position & compromises may have to be made.