Objective To introduce a new surgical technique for the treatment of zone Ⅰ extensor tendon complete laceration which involves the application of a Palmaris Longus tendon to provide tenodesis.Methods The study cohort was 67 consecutive adult patients who had sustained zone Ⅰ extensor tendon complete laceration.To harvest the ipsilateral Palmaris Longus tendon, then a 1.5mm drill bit is inserted through the head of the distal phalanx.Palmaris Longus tendon is threaded through the drill hole from dorsal to ventral and the ventral end is tied in a simple knot and end trimmed.The Palmaris Longus tendon is then sutured to the extensor tendon close to the distal phalanx insertion site and also at mid middle phalanx with interrupted sutures using polydioxanone.Results The results of this study showed that tenodesis with Palmaris Longus tendon after extensor tendon laceration leads to excellent or good results in more than 95% according to ASSH classification and in more than 95% according to Miller s scoring.No further treatment was needed.Conclutions Tenodesis with Palmaris Longus tendon after complete extensor tendon laceration is a reliable alternative for the treatment of isolated acute or chronic rupture of extensor tendons of zone Ⅰ.