In pathology, a contracture is a permanent shortening of a muscle or joint. It is usually in response to prolonged hypertonic spasticity in a concentrated muscle area, such as is seen in the tightest muscles of people with conditions like spastic cerebral palsy, but can also be due to congenital abnormal development of muscles and connective tissue in the womb.
Contractures develop when normally elastic tissues such as muscles or tendons are replaced by inelastic tissues (fibrosis). This results in the shortening and hardening of these tissues, ultimately causing rigidity, joint deformities and a total loss of movement around the joint. Most of the physical therapy, occupational therapy and other exercise regimens targeted towards people with spasticity focuses on trying to prevent contractures from happening in the first place. However, research on sustained traction of connective tissue in approaches such as adaptive yoga has demonstrated that contracture can be reduced, at the same time that tendency toward spasticity is addressed.
Contractures can also be due to ischemia (restriction of blood flow) leading to death of muscle tissue, as in Volkmann's contracture. They can also be caused by excessive myofibroblast and matrix metalloproteinase accumulation in wound margins following injury.
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- Nambi, Gopal S & Amisha Atul Kumar Shah (2013). "Additional effect of iyengar yoga and EMG biofeedback on pain and functional disability in chronic unilateral knee osteoarthritis". International Journal of Yoga. 6 (2): 123–127. doi:10.4103/0973-6131.113413. PMC 3734638. PMID 23930031.
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