[Subdivisions of "no man's land" of flexor tendon and the treatment of each subzone].

"No man's land" of the flexor tendon system was divided into 4 divisions according to our anatomical study. Clinically, 72 flexor tendon injuries in "no man's land" were repaired during the primary and delayed primary stages. Different treatment methods of flexor tendons, sheath, vincule and postoperative exercises were used according to the degree of injuries, anatomical and functional characteristics of each division. Excellent or good results were obtained in 81.3% of cases. The significance of the sa division of Bunnell's "no man's land" and selection of treatment method in each subzone were discussed. We believe that primary and delayed primary repair can restore good function to the repaired tendon. The effective way to enhance the results of tendon repair is to apply comprehensive treatments according to the extent of injury to the intrinsic healing capacity of the flexor digitorum profundus tendon.