Acute synovitis of the knee resulting from intra-articular knee penetration as a complication of flexible intramedullary nailing of pediatric femur fractures: report of two cases.

Management of pediatric femur fractures using flexible intramedullary nail fixation is widely accepted. Few complications have been reported in the literature; these include primarily malunions and nonunions. The authors present two cases of a previously unreported complication-acute synovitis of the knee following intra-articular penetration of the knee joint by migration of a flexible nail.