[Tenolysis of the flexor tendons in the hand]

Properly gliding flexor tendons is mandatory for the normal functioning of the finger and thumb. Any damage to tendons, tendon sheath or adjacent tissue can lead to the formation of adhesions that inhibit the normal gliding function. If adhesions limit the digital function and adequate hand therapy does not provide further progress, then surgical intervention should be considered.

The authors' strategy and treatment algorithm for flexor tenolysis are presented in the context of the current literature.

There is no absolute indication for flexor tenolysis. The decision should be made in a motivated patient who has access to adequate postoperative hand therapy. It should be based on healed fractures and osteotomies, mature soft tissue coverage, intact tendons and gliding tissues, and a full range of passive flexion, and preferably extension of the affected joints. The principle of flexor tenolysis is the consequent resection of all adhesive tissue around the tendon inside and outside the tendon sheath, with preservation of as many pulley sections as possible. Therefore, extensive approaches are frequently necessary. Arthrolysis and the resolution of unfavorable scars, the resection of scarred lumbricals, and pulley reconstruction are additional procedures that are frequently performed.

In the literature, improvement in the range of motion is between 59 and 84 %. Good and excellent functional results are reported in 60-80 % of the cases. Nevertheless, in selected cases, functional deterioration occurs. Flexor tendon ruptures after tenolysis were observed in 0-8 % of the patients.

With regard to complications such as secondary tendon ruptures, loss of pulleys, and scar formation, flexor tenolysis is part of a reconstructive ladder that includes further procedures. In the case of failure or complications, salvage procedures such as arthrodesis, amputation, and ray resection or staged flexor tendon reconstruction including tendon grafting are recommended. After successful flexor tenolysis long-term hand therapy for at least 3-6 months is mandatory to maintain the intraoperative gain of function.