Muscle contractures can occur for many reasons, such as paralysis, muscular atrophy, and forms of muscular dystrophy. Fundamentally, the muscle and its tendons shorten, resulting in reduced flexibility.
For example, in the case of partial paralysis (i.e. poliomyelitis) the loss of strength and muscle control tend to be greater in some muscles than in others, leading to an imbalance between the various muscle groups around specific joints. Case in point: when the muscles which flex the foot upward are less functional than the muscles which flex the foot downward a contracture occurs, giving the foot a progressively downward angle and loss of flexibility. Various interventions can slow, stop, or even reverse muscle contractures, ranging from physical therapy to surgery. A common cause for having the ankle lose its flexibility in this manner is from having sheets tucked in at the foot of the bed when sleeping. The weight of the sheets keep the feet flexed downward all night. Correcting this by not tucking the sheets in at the foot of the bed, or by sleeping with the feet hanging of the bed when in the prone position, is part of correcting this imbalance.
It occurs also due to muscle tightening for example if after fracture when immobilization is done by putting plaster of paris the muscle length shortens because the muscle is not used for a large span of time.
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