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Hypertonic muscle, or hypertonia, is a condition that causes tight muscles and stiff or rigid movements. It is characterised by abnormally increased muscle tone caused by upper motor neuron pathology in the brain or spinal cord. Hypertonia can be caused by a variety of factors, including cerebral palsy, birth injuries, a blow to the head, stroke, brain tumours, toxins that affect the brain, neurodegenerative processes, or neurodevelopmental abnormalities. It is typically noticeable within the first 18 months of a child's life and can cause delays in motor skills development. Treatment options for hypertonia include physical therapy, oral medications, and intramuscular injections.
| Characteristics | Values |
|---|---|
| Definition | Abnormally increased muscle tone caused by upper motor neuron pathology in the brain or spinal cord |
| Causes | Blow to the head, stroke, brain tumours, toxins that affect the brain, neurodegenerative processes (e.g. multiple sclerosis, Parkinson's disease), neurodevelopmental abnormalities (e.g. cerebral palsy) |
| Symptoms | Delays in motor skills development, stiff or rigid movements, difficulty with sitting, standing, or performing simple movements, twisting and repetitive movements, abnormal postures |
| Diagnosis | MRI, CT scans, electromyogram to measure muscle function |
| Treatment | Physical therapy, oral medications (e.g. muscle relaxants), intramuscular injections, assistive devices like orthotics |
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What You'll Learn
- Hypertonia is caused by upper motor neuron pathology in the brain or spinal cord
- Hypertonia can manifest as spasticity, dystonia, rigidity, or a combination of these subtypes
- Hypertonia is characterised by resistance to passive movement
- Hypertonia is common in those with cerebral palsy
- Hypertonia can be treated with muscle-relaxing medications
Hypertonia is caused by upper motor neuron pathology in the brain or spinal cord
Hypertonia, or high muscle tone, is a condition that causes tight muscles and stiff or rigid movements. This can make it difficult to sit, stand, or perform simple day-to-day movements. Hypertonia is caused by upper motor neuron pathology in the brain or spinal cord. It is characterised by abnormally increased muscle tone, which can manifest as spasticity, dystonia, rigidity, or a combination of these subtypes.
Spasticity is a common form of hypertonia, often caused by injury to the central nervous system, resulting in an upper motor neuron lesion. This can lead to uncontrollable muscle spasms, stiffening, or straightening out of muscles, shock-like contractions, and abnormal muscle tone. It is frequently seen in children with cerebral palsy, where it is the most common tone abnormality. Spasticity is also associated with stroke and spinal cord injuries.
Dystonia is another form of hypertonia, characterised by sustained or intermittent muscle contractions that cause twisting and repetitive movements, abnormal postures, or both. Dystonia can cause hypertonia when there is sustained co-contraction, resulting in muscle resistance to passive stretching. It is important to note that not all dystonia is hypertonic.
Rigidity, sometimes referred to as Parkinsonian rigidity, is a severe form of hypertonia where muscle resistance occurs throughout the entire range of motion of the affected joint, independent of velocity. It is characterised by stiffness, decreased range of motion, and loss of motor control.
The treatment for hypertonia depends on the individual's pathology and functionality and may include physical therapy, oral medications, intramuscular injections, and surgical procedures. Muscle-relaxing medications such as baclofen, diazepam, and dantrolene are commonly used to treat spastic hypertonia. Physiotherapy techniques such as stretching, inhibitory pressure, and rhythmic rotation can also help control hypertonia by reducing motor neuron excitability and promoting normal movement patterns.
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Hypertonia can manifest as spasticity, dystonia, rigidity, or a combination of these subtypes
Hypertonia is a condition characterised by abnormally increased muscle tone caused by upper motor neuron pathology in the brain or spinal cord. It is often noticeable in children within the first 18 months of their lives as their bodies start to develop. A tell-tale sign of hypertonia is a delay in motor skills development. The condition can make it difficult to perform simple daily movements like sitting or standing.
Hypertonia can manifest in different ways, including spasticity, dystonia, rigidity, or a combination of these subtypes. Spasticity is defined in terms of the properties of the joint being examined. It does not depend on the presence of other positive features like clonus, Babinski sign, and hyperactive reflexes, or negative features like weakness, poor coordination, and loss of control. However, these features are frequently present in spasticity.
Dystonia is a movement disorder characterised by sustained or intermittent muscle contractions, resulting in abnormal and often repetitive movements, postures, or both. Dystonic movements are typically patterned and twisting and may be tremulous. Dystonia causes hypertonia when there is sustained co-contraction. It is important to note that not all dystonia is hypertonic.
Rigidity, sometimes referred to as parkinsonian rigidity, is characterised by resistance to externally imposed joint movement, even at very low speeds. It does not depend on the speed of passive resistance, and there is no speed or angle threshold. The limb does not tend to return to a particular fixed posture or extreme joint angle. Rigidity can worsen with voluntary activity in distant muscle groups.
The management of hypertonia depends on the individual's pathology and functionality and may include physical therapy, oral medications, intramuscular injections, and, in some cases, surgical procedures.
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Hypertonia is characterised by resistance to passive movement
Hypertonia is a condition characterised by abnormally increased muscle tone, which causes muscles to become tight and stiff, and therefore resistant to passive movement. It is caused by upper motor neuron pathology in the brain or spinal cord, which results in an increased state of active muscle contraction, even at rest. This can make it difficult to perform simple daily movements such as sitting or standing. Hypertonia is commonly associated with cerebral palsy but can also be caused by other factors such as a blow to the head, stroke, brain tumours, toxins that affect the brain, or neurodegenerative processes such as multiple sclerosis or Parkinson's disease.
Dystonia, a movement disorder characterised by involuntary sustained or intermittent muscle contractions, can cause hypertonia if the contractions are present at rest and do not relax upon attempts at passive movement. Dystonic hypertonia is characterised by resistance to passive movement that does not change with changes in the speed of passive movement or joint angle. It may be associated with simultaneous contraction of agonist and antagonist muscles, resulting in a fixed involuntary posture. Dystonia is not the only cause of hypertonia, and it is important to note that not all dystonia is hypertonic.
Rigidity, sometimes referred to as Parkinsonian rigidity, is another subtype of hypertonia characterised by resistance to externally imposed joint movement, even at very low speeds. It does not depend on the speed or angle of passive resistance, and there is no fixed posture or extreme joint angle. This type of hypertonia is often associated with diseases involving the basal ganglia, a deep region of the brain, such as Parkinson's disease. Spasticity is yet another type of hypertonia, characterised by increased muscle spasms during movement and exaggerated reflex responses.
The severity of hypertonia can vary greatly, ranging from mild cases with little to no impact on a person's health to severe cases resulting in immobility and serious health consequences such as increased bone fragility, infection, bed sores, and pneumonia. Treatment options for hypertonia include physical therapy, oral medications, intramuscular injections, and assistive devices such as orthotics to prevent muscle over-constriction.
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Hypertonia is common in those with cerebral palsy
Hypertonia, or high muscle tone, is a condition characterised by tight muscles and stiff or rigid movements. This can cause difficulty in performing simple daily tasks such as sitting or standing. Hypertonia is often noticeable in children within the first 18 months of their lives as they start to develop motor skills. A tell-tale sign of the condition is a delay in the development of these motor skills.
Hypertonia is commonly associated with cerebral palsy. Cerebral palsy is caused by damage to parts of the brain that control motor functions, such as muscle tone. The most common type of cerebral palsy is spastic CP, which is an outcome of hypertonia. Spastic CP is characterised by velocity-dependent resistance to movement, meaning that the faster a joint is straightened, the tighter it feels. Symptoms of spastic CP may also include spasms, pain, and involuntary muscle contractions.
Hypertonic cerebral palsy is characterised by overly toned muscles, which cause muscles to become stiff and difficult to control. This can make walking and controlling body movements challenging. The severity of hypertonia is proportional to the severity of neurological impairment. Treatment options for hypertonic cerebral palsy include physical therapy, medication, and, in severe cases, surgery. Physical therapy can help with balance, coordination, and muscle lengthening and strengthening. Medication, such as muscle-relaxing drugs, can help with muscle stiffness and rigidity. Surgery is often a last resort to correct secondary problems resulting from hypertonia, such as tendon-lengthening, repair of scoliosis, or joint contractures.
It is important to note that not all cases of hypertonia are caused by cerebral palsy, and the condition can have other causes, such as birth injuries, infectious encephalopathies, stroke, trauma, premature birth, or genetic disorders.
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Hypertonia can be treated with muscle-relaxing medications
Hypertonia, or high muscle tone, is a condition characterised by an abnormal increase in muscle tension. This can cause stiff or rigid movements, making it difficult to sit, stand, or perform simple daily tasks. It is often noticed in children within the first 18 months of their lives as they start to develop motor skills. The condition is usually identified by delays in motor skills development and can be diagnosed through imaging tests like MRI and CT scans.
Hypertonia is caused by an injury to the central nervous system or spinal cord, which disturbs the nerve pathways that control muscle tone. It can also be caused by cerebral palsy, which is triggered by damage to the parts of the brain that control motor functions. Dystonia, a movement disorder characterised by involuntary muscle contractions, can also cause hypertonia.
There are several treatment options for hypertonia. Physiotherapy is a highly effective method to reduce the effects of the condition and improve function. This involves muscle stretching and techniques to facilitate normal movement. Oral medications are also used to treat hypertonia, including muscle-relaxing drugs such as baclofen, diazepam, dantrolene, tizanidine, and clonazepam. Botulinum toxin can also be used to treat focal spasticity, while intrathecal baclofen is effective in regulating increased tone in patients with incomplete cord lesions.
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