The biological characteristic of the silastic rod which in vivo induce the pseudosheath formation has popularized its application in the reconstructive surgery of flexor tendon injury of the digit, especially in the zone I, no-man's-land. We performed staged tendon graft in 14 digits(9 cases) and the following were the results. Clinical results of the 13 digits were good in 10 digists(77%). One case showed the untoward ill effect postoperatively. The above study has also shown that this staged tendon graft operation is applicable even to the higher grade of injury by Boyes. For the prevention of bowstring effect, A2 and A4 pulleys seem to be more essential than A1, A2. and A3.