BACKGROUND:Lateral retinacular release is effective to treat anterior knee pain, but it has not been confirmed through the parameters of the knee joint. OBJECTIVE: To analyze the relevant parameters on the axial X-ray films of the patela before and after lateral retinacular release and then to find out the efficient parameters for patelofemoral joint disorders on the axial X-ray film of the patela, which are of most clinical significance. METHODS: Fifty patients with anterior knee pain were included randomly who admitted at the Department of Joint Surgery, Affiliated Hospital of Jining Medical University from February 2009 to December 2013, including 45 cases of Outerbridge I-III undergoing arthroscopic lateral retinacular release+articular cartilage repair and 5 cases of Outerbridge IV undergoing lateral retinacular release+knee joint surface replacement. RESULTS AND CONCLUSION:After lateral retinacular release, the congruence angle, patelofemoral index and tilt angle were al reduced significantly (P < 0.05 orP < 0.01), but there was no change in the lateral patelofemoral angle (P > 0.05). The patelar trajectory restored to the corresponding central position of the femoral condyle, and meanwhile, no joint hematoma, deep vein thrombosis and patelar subluxation occurred. These findings indicate that the lateral retinacular release is of great significance for treatment of anterior knee pain induced by lateral patelofemoral compression.

Objective To explore.the effect of operative treatment for more than 70-year-old patients with osteoporotic hip fracture,and analyze the clinical feature,perioperative management and choices of operative treatment.Methods One hundred and fifty-nine patients of more than 70-year-old with osteoporotic hip fracture were operated from June 2007 to October 2010.Fracture type:38 cases with intertrochanteric fracture while femoral neck fracture in 121 cases.Results One hundred and thirty-five cases were followed up after operation ranging from 3 to 43 months.There were 2 cases by proximal femur nail internal fixation,13 cases by proximal femur locked plate internal fixation,15 cases by dynamic hip screwinternal fixation,48 cases by bipolar femoral head arthroplasty and 57 cases by total hip arthroplasty.The Harris scores of various surgical method above respectively were 100.0％ (2/2),76.9％ ( 10/13 ),80.0％(12/15),89.6％ (43/48),96.5％ (55/57).Conclusions The operation plays an important role in the treatment of elderly osteoporotic hip fracture,having so many advantages as earlier mobilization,less complications and better life quality.But it is important to pay attention to perioperative management and choose reasonable surgical approach according to classification of fracture.