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What Causes It?
Research has shown that anything preventing normal joint movement before birth can result in joint contractures. The joint itself may be normal. However, when the joint is not moved for a period of time, extra connective tissue tends to grow around it, fixing it in position. Lack of joint movement also means that tendons connecting to the joint are not stretched to their normal length; short tendons, in turn, make normal joint movement difficult and contractures may occur.
In general, there are four causes of limitation of joint movement before birth:
Distinctive skin dimples may be seen over the joints, where the skin appears to be attached to the underlying structures.
*Information in this section is taken from a publication of AVENUES, the arthrogryposis support group in U.S.A.