Patient, male, 23 years old, was electrocuted on the dorsal side of the proximal interphalangeal joint of his left index finger half a year ago, resulting in dorsal burn necrosis of the dorsal skin of the proximal interphalangeal joint, tendon, joint capsule, and the dorsal bone at the base of the middle phalanx, and underwent phase I of local debridement and removal of the necrotic bone in a local hospital, as well as abdominal flap for repairing the trauma, and dorsal tendon grafting in phase II, and has recently found severe deformity of the finger, without functional recovery, and has asked for Further treatment, on January 24, 2015 was admitted to the hospital. Examination: left index finger proximal interphalangeal joint pike swelling, radial deviation deformity is obvious, the palmar side of the joint is bulging, dorsal side is a darker pigmented area covered by the skin flap. x-ray: dislocation of proximal interphalangeal joint of the left index finger, there is a bone defect at the head of proximal interphalangeal joint and dorsal side of the base of the middle interphalangeal joint, middle and distal interphalangeal joints are deviated to the radial side, and the final joint is flexed and extended from 0b to 30b. Diagnosis of admission: sequelae of hand trauma:1, proximal interphalangeal joint of the left hand index finger After destruction injury and old dislocation deformity; 2, and proximal and middle phalanx bone defect; 3, and proximal interphalangeal joint ulnar collateral ligament deficiency; 4, after left index finger dorsal flap repair. Surgical plan development: 1, joint repositioning: due to the accompanying more bone defects, the continuity of the bone joint is interrupted, and it is no longer suitable for simple incision and repositioning; 2, phalangeal joint prosthesis replacement: the patient’s phalangeal joint dislocated and the middle phalanx with a large number of bone defects at the base of the base of the phalangeal bone, and accompanied by the ulnar collateral ligament deficiency, it is not suitable for placing a prosthesis, due to the bottom of the prosthesis placed in the bone defects and the lack of lateral collateral ligament will lead to instability of the prosthesis, give up the surgical program 3. Interphalangeal joint fusion: After interphalangeal joint fusion, the finger joint is in a functional position, which can restore the pinching function of the index finger and the thumb, and there is still a certain degree of mobility of the last phalanx before the operation, considering that the affected finger will recover about 70% of its function after the operation, the interphalangeal joint fusion was finally chosen. Intraoperative self-requirements: 1. Surgery under microscopic magnification can avoid vascular nerve injury as much as possible, and at the same time, the peritendinous membrane of the tendon can be preserved to prevent adhesion of the tendon and reduce tissue damage; 2. Non-injurious sutures and absorbable sutures can be used to reduce the rejection of sutures to tissues; 3. Antiadhesion materials are placed around the peritendinous membrane at the end of the operation to prevent the tendon from being readhered to the tendon; 4. Degreasing of the original flap for liposculpture; Intraoperative Picture: The shape of the index finger was corrected to normal at the end of the operation, and the flap bloat was significantly improved. The thumb and index finger have been restored to the grasping and pinching position. The thumb and index finger have returned to the grasping and pinching position. 10 days after the operation, the hand was discharged from the hospital with a picture of its appearance. A follow-up will be uploaded at 3 months postoperatively. Self-assessment: 1. Surgery under microscopic magnification avoids damaging the tiny vascular nerves in the fingers; 2. Suturing the subcutaneous tissues and wounds with non-invasive sutures under the microscope is both cosmetic and minimally invasive.