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De Quervain’s tendinitis occurs when the tendons around the base of the thumb become irritated or swollen, causing the synovium around the tendon to swell and changing the shape of the compartment, which makes it difficult for the tendons to move properly.

Dupuytren’s contracture is a thickening of the fibrous tissue layer underneath the skin of the palm and fingers. It is a painless condition and not dangerous, however, the thickening and tightening (contracture) of this fibrous tissue can cause the fingers to curl (flex).

Extensor tendon lacerations (wounds, cuts or tears) of the hand and fingers are quite common injuries, and can occur at many different levels. They are often associated with deep structure damage, such as bone, joint and ligamentous support. Symptoms include one or more of the following: loss of function or strength, diminished range of motion, and weakness when straightening the fingers or hand.