Clinical Example: Thenar atrophy and pseudoatrophy


 
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The adduction contracture from basal joint arthritis can give the appearance of thenar atrophy.
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Thenar atrophy from carpal tunnel syndrome. However, look at how the flexor brevis is preserved - acting as a weak but adequate abductor. 
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Anomalous muscle insertion associated with thumb duplication operated on in childhood.
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