Objective To explore the efficacy of arthroscopic treatment for acute avulsion fracture of posterior cruciate ligament (PCL) using double titanium plate TightRope. Methods From December 2014 to January 2015, two cases with acute avulsion fracture of PCL were treated with double titanium plate TightRope under arthroscopy, after assessment of three dimensional reconstructive CT and MRI. Rehabili-tation was carried out after operation. Results One case succeeded with double titanium plate TightRope, and rehabilitation could be per-formed early postoperatively. Another case failed in TightRope fixation, and accepted two internal hollow screws fixation instead. Rehabili-tation was delayed until two weeks postoperatively. The function of the knee was satisfactory in the former patient after three months, who could extend the knee in a normal range, without pain or locking. The same effect was gained in the latter patient after four months. Conclu-sion For acute tibial avulsion fracture of PCL with larger and intact fragment without osteoporosis, arthroscopic restoration and fixation with double titanium plate TightRope offers the opportunity to achieve anatomic reconstruction and rigid fixation for early rehabilitation in adult patients.

ObjectiveTo investigate the characteristics of knee stiffness and the results of rehabilitation after the fractures of distal femur （DF）, tibial plateau （TP） or patella （PF）. Methods70 cases with knee stiffness after DF, TP or PF were analyzed retrospectively. ResultsNo significant difference was observed in passive range of motion (PROM) among three groups (F=1.671，P=0.196) before rehabilitation. The differences were significantly different (F=19.264, P=0.000) 8 weeks after rehabilitation. Further LSD analysis revealed that there was significant difference between DF and TP (P=0.000) as well as DF and PF (P=0.000), but no significant difference was observed between TP and PF (P=0.114). ConclusionThe outcome of rehabilitation is associated with the locations of fracture, and the distal femoral fractures is the worst.

Objective To investigate the effect of internal fixation of plates on displaced intra-articular fracture of the calcaneus. Methods 27 patients with calcaneal fracture and treated surgically with open reduction and internal fixation were analyzed retrospectively. Results All the cases are closed fracture. According to the Sanders classification, 18 cases were type 2 calcaneal fractures, and 9 were type 3. 6 cases (22.2%) showed wound-healing problems. The average Bohler's angle before and after surgery was 7.5° and 27.54° respectively. 20 patients were followed up for average 16.8 months, and all showed excellent walking ability and normal gait, and no shoe wear complaints. Conclusion Open reduction and internal fixation can guarantee the anatomic reduction of displaced calcaneal fractures, and the outcomes are satisfied.

ObjectiveTo observe the clinical effect of unstable femoral intertrochanteric fracture treated with DHS. Methods Summarized 37 cases of unstable femoral intertrochanteric fracture treated by DHS,all cases were commented by fracture type,operation method and clinical effect. ResultsWe have followed up 37 cases from 0.8 to 4.7 years with average of 2.5 years.Conclusions DHS is one of the best implants due to its merits of strong fixation, little complication and early rehabilitation exercise.

ObjectiveTo observe effects of the nonunion of stale humeral shaft fracture treated by using the interlocking medullary nail.Methods21cases with the stale fracture of humeral shaft were treated with the interlocking medullary nail. The effect over post operation 1 year was evaluated.ResultsAll cases were recovery after treated by the interlocking medullary nail. Conclusions It shows that the effect of treating the fracture of humeral shaft with the interlocking medullary nail is very satisfactory.

Objective To analyze the outcome of total knee arthroplasty with retaining patellar in osteoarthritis.Methods 45 knee joints in osteoarthritis were performed operatively with posterior stabilized knee arthroplasty between January 2005 and June 2008. The series include 7 sides(males) and 38 sides(females). The mean age of patients was 65.7 years ranging from 52 to 79 years, and the data were analyzed by The Hospital for Special Surgery(HSS) score system. Results The follow-up period was averagely 25 months ranging from 8 to 51 months. According to HSS score system, 28 sides were rated as excellent（62.2%）, 12 sides as good（26.7%）, 4 fair（8.9%）and 1 poor（2.2%）, and the excellent-good rate was 88.9%. Conclusion Posterior stabilized knee arthroplasty with retaining patellar represents a simple and valuable treatment methodology for the most osteoarthritis of the knee joint.

ObjectiveTo compare the effect of imagings taken with different angles to observe relationship of wrist joint and distal screws.Methods29 patients with the distal radius fractures were performed operatively with the open reduction and internal fixation. The standard antero-posterior and lateral imagings of the wrist joint were taken during operation, and two different angle imagings of the wrist joint were also taken meantime in all 29 patients.ResultsScrews were found to penetrate into the joint in antero-posterior imagings of 23 cases and standard lateral imagings of 25 cases. However, no screws were found to penetrate into the joint in two different angle imagings.ConclusionTwo different angle imagings can fully show the articular surface of distal radius without screws.

ObjectiveTo analyze the epidemiological and clinical characteristics of children's lower extremity amputation and amputation rehabilitation, and to explain the causes of children's amputation and the complications after amputation. MethodsFrom January, 2016 to March, 2021, 51 amputation related children were retrospectively analyzed. The correlation between the cause of amputation and complications post amputation were analyzed. ResultsTraumatic amputations accounted for 58.82%, and the main cause was traffic accidents (70%). Amputations caused by diseases accounted for 41.18%, and the main cause was congenital limb deformities (80.95%). Traumatic amputation was more likely to have stump complications than expected (P < 0.05). The possibility of stump complications after disease-specific amputation was lower than expected (P < 0.05). ConclusionTraffic trauma is the main cause of amputation in children and is characterized clinically by a high incidence of unsatisfactory stumps, mainly due to soft tissue abnormalities, and most cases require stump revision to improve the poor residuals for prosthetic restoration of ambulation. Congenital pseudarthrosis of the tibia is the main cause of disease-specific amputation, and the outcome of amputation often cannot be definitely avoided even after long-term limb preservation treatment.