BACKGROUND:Many studies have demonstrated that restoration of femoral offset in revision total hip arthroplasty would contribute to the recovery of joint function.OBJECTIVE:To investigate the importance of restoration of femoral offset in revision total hip arthreplasty on the recovery of joint function.METHODS:An observational study was performed at the Department of Orthopedics,Third Affiliated Hospital of Guangzhou Medical University between February 2004 and May 2007.A total of 15 patients with the revision total hip arthroplasty,including 12 males and 3 females,aging 62 75 years,averaging 67 years old,were recruited into this study.Harris evaluation system was used to evaluate joint function.The femoral neck anteversion and the femoral offset were measured by the method of Sakai.The vertical distance from the teardrop line to the most prominent point of the lesser trochanter was measured from each radiograph.References were combined to investigate the effect of restoration of femoral offset in revision total hip arthroplasty on joint function.RESULTS AND CONCLUSION:All the 15 patients were recruited into this study.The duration of follow-up ranged from 24 months to 5 years.We measured the femoral offset on pre- and post-operative radiographs,and the results indicated that the femoral offset of 4 patients were above 4 mm.The femoral offset of 11 patients was restored.The femoral offset were 22-48 (32.21±0.64) mm pre- and 22-57 (36.13±0.82) mm post-operative radiographs,respectively.The mean difference in femoral offset post-operatively was significant (t=0.424,P=0.01 ).Harris scores were good in 4 cases,passable in 2 cases,and poor in 9 cases pre-operatively,and the scores were excellent in 8 cases,good in 4 cases,passable in 2 cases,and poor in 1 case post-operatively.The score of Harris evaluation system in the patient of restoration group and failed restoration group were 88.72±5.3 (80%) and 72.32±6.5 (27%) post-operative at 1 month respectively.The mean difference of the score was significant (χ~2=1.245,P<0.05).The 3 patients had complication,one was the dislocation of hip,and two had the pain of hip.All the patients with complication were in failed restoration of femoral offset,which was above 4 mm.The restoration of femoral offset contributes to the recovery of joint function and reduce complication occurrence after total hip arthroplasty revision.

BACKGROUND:The number of complications after hip replacement, such as infection, implant loosening, fracture prosthesis wear, osteolysis, and recurrent dislocation, had drastical y increased. These complications would induce the increased occurrence of total hip revision.
OBJECTIVE:To analyze the causes and treatment measures of revision after total hip replacement. METHODS:The reasons for revision, the prosthesis selection, the treatment of bone defect and the postoperative rehabilitation were discussed in 33 cases after total hip replacement. The prosthesis for revision included general metal ring and lining (21 cases), large head and cup (8 cases), polyethylene cup (4 cases), general femoral components (15 cases, including 11 cases fixed by bone cement), and lengthening femoral components (18 cases, including 9 cases fixed by bone cement and 6 cases of combined components).
RESULTS AND CONCLUSION:Al 33 patients were fol owed up for 24-60 months, averagely 36.5 months. After revision, wound healed perfect, and the prosthesis was reliable. No case suffered from infection or dislocation. Hip joint function was greatly improved. Harris score was increased from 37.1 preoperatively to 91.3 postoperatively. Medium-or short-period clinical fol ow-up results demonstrated that if the indication of revision was right, bone defects were handled perfectly, prosthesis was chosen correctly, one-stage total hip revision can get a good clinical efficacy.

BACKGROUND:For the patients with proximal humeral fractures or serious complications, internal fixation is the effective method that cannot influence the activity of the shoulder with few trauma. OBJECTIVE:To investigate the biomechanical characteristics of percutaneous plate combined with anatomical locking plate fixation for the treatment of proximal humeral fractures. METHODS:Seventy-five patients with proximal humeral fractures were selected from Department of Orthopedics, the Third Affiliated Hospital of Guangzhou Medical University between March 2007 and December 2011. The healing after the locking plate fixation and the shoulder joint score after internal fixation were observed. The biomechanical advantages of locking plate fixation in the treatment of proximal humeral fractures were analyzed. RESUTLS AND CONCLUSION:Al the 75 patients were fol owed up for 6-24 months, average 13.3 months. The X-ray film after treatment showed al the screws were in correct position with satisfactory fracture reduction, and the fractures were healed without neurovascular injury and humeral head necrosis;one case had infection and healed after treatment, 72 cases had no shoulder pain, while three cases had occasional shoulder pain. The Neer score was excel ent in 57 cases, good in 11 cases, moderate in seven cases and poor in none, and the excel ent and good rate was 90.7%. Compared with other fixation implants, the locking plate fixation in the treatment of proximal humeral fractures has the advantages of high fixation strength and satisfactory effect, becoming the first choice for the clinical treatment of proximal humeral fractures.