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The extensor tendon apparatus.

The extensor tendon apparatus is less involved with tenosynovial disease than the flexor tendons. It is, however, frequently affected by bony erosions at the wrist and synovial disease of the metacarpophalangeal joints with consequent loss of function due to rupture or dislocation. The causes of rupture have been discussed and the means of treatment described. Details of metacarpophalangeal deformities of the fingers and thumb, and their management are given in Chapters 5, 8 and 9.