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A finger contracture caused by Dupuytren's contracture. 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.
In pathology, a contracture is a shortening of muscles, tendons, skin, and nearby soft tissues that causes the joints to shorten and become very stiff, preventing normal movement. [ 1 ] [ 2 ] A contracture is usually permanent, but less commonly can be temporary (such as in McArdle disease ), [ 3 ] or resolve over time but reoccur later in life ...
Muscle atrophy is the loss of skeletal muscle mass. It can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. Muscle atrophy leads to muscle weakness and causes disability.
Atrophy is the partial or complete wasting away of a part of the body. Causes of atrophy include mutations (which can destroy the gene to build up the organ), poor nourishment, poor circulation, loss of hormonal support, loss of nerve supply to the target organ, excessive amount of apoptosis of cells, and disuse or lack of exercise or disease intrinsic to the tissue itself.
Tubular aggregate myopathy (TAM1 & TAM2) includes, among other symptoms, contractures, muscle weakness, and fatty atrophy of muscle. [24] [25] [26] Typical to Bethlem myopathy 1 and 2 are the presence of multiple contractures. [11] [5] A contracture can be caused by a variety of reasons, from disease to lifestyle (see Muscle contractures).
The importance of correctly recognizing progressive muscular atrophy as opposed to ALS is important for several reasons. The prognosis is a little better. A recent study found the 5-year survival rate in PMA to be 33% (vs 20% in ALS) and the 10-year survival rate to be 12% (vs 6% in ALS). [1]
Often, every joint in a patient with arthrogryposis is affected; in 84% all limbs are involved, in 11% only the legs, and in 4% only the arms are involved. [4] Every joint in the body, when affected, displays typical signs and symptoms: for example, the shoulder (internal rotation); wrist (volar and ulnar); hand (fingers in fixed flexion and thumb in palm); hip (flexed, abducted and externally ...
Spinal muscular atrophy (SMA) is a rare neuromuscular disorder that results in the loss of motor neurons and progressive muscle wasting. [ 3 ] [ 4 ] [ 5 ] It is usually diagnosed in infancy or early childhood and if left untreated it is the most common genetic cause of infant death. [ 6 ]