Update on Zone II Flexor Tendon Injuries.

Flexor tendon repair in zone II is particularly challenging because tendon gliding must be restored within a tight fibro-osseous sheath while minimizing the formation of adhesions in surrounding tissues. Meticulous surgical technique using a multistrand core suture and a peripheral suture is needed to produce a tendon that is strong enough to withstand early mobilization. Mechanical strength increases with the number of strands crossing the repair, regardless of the core suture configuration. Early mobilization after flexor tendon repair enhances the strength of the repair and decreases the risk of adhesions and joint stiffness. Satisfactory results have been achieved with either early passive or early active motion rehabilitation protocols; therefore, the choice of postoperative rehabilitation program is at the discretion of the surgeon. Factors such as repair integrity, concurrent injuries, and anticipated patient compliance should be considered in the decision-making process.