Permanently stiff joints (contractures) develop in people with
cerebral palsy when the muscles surrounding the joints
do not relax. The tight muscles permanently bend the joint, resulting in
difficulty straightening the affected limb. Without treatment, over time it may
become impossible to move the joint.
Contractures usually affect the joints in the hip, knee, ankle,
elbow, and wrist. Hip contractures usually occur after infancy. Increased
muscle tone (spasticity) is the main problem in infants and young children.
People with cerebral palsy are prone to developing contractures
because their muscles:
- Have too much muscle tone
(hypertonia).
- Do not grow at the same rate as their
bones.
- Become weak if they are not used.