Intratendinous rupture of flexor digitorum profundus caused by non-specific synovitis.

Closed ruptures of flexor tendons in the hands of patients without rheumatoid arthritis are rare. We report a case of closed rupture of the flexor digitorum profundus of the middle finger in zone II, secondary to acute florid synovitis forming a tumour-like mass. No similar case has been reported to our knowledge. The management of this unexpected finding at surgical exploration is discussed.