[Imaging reasons for periprosthetic femoral fractures during the operation of total hip arthroplasty with anatomic prosthesis].

Objective: To explore the imaging reasons for periprosthetic femoral fractures during the operation of total hip arthroplasty with anatomic prosthesis.

Methods: The fracture group consisted of 7 cases with periprosthetic femoral fracture (PPFF) and the non-fracture group 21 cases without PPFF during the operation of total hip arthroplasty (THA) among the 144 cases of primary THA with anatomic prosthesis. The preoperative plain films of hip joint were taken to calibrate the Sharp's angle, centre edge (CE) angle, femoral neck shaft angle, femoral anteversion angle of neck, bowing angle of proximal femoral shaft part, width of narrowest part in proximal femoral shaft.

Comparison of the effect of posterior lumbar interbody fusion with pedicle screw fixation and interspinous fixation on the stiffness of adjacent segments.

Background: Adjacent segment degeneration could seriously affect the long-term prognosis of lumbar fusion. Dynamic fixation such as the interspinous fixation, which is characterized by retaining the motion function of the spinal segment, has obtained satisfactory short-term effects in the clinical setting. But there are few reports about the biomechanical experiments on whether dynamic fixation could prevent adjacent segment degeneration.

[Treatment of unstable chronic anterior cruciate ligament-deficient knee with osteoarthritis].

Objective: Untreated ruptures of anterior cruciate ligament (ACL) lead to progressive meniscus tear and development of knee osteoarthritis over decades. The present study was designed to explore the early results of ACL reconstruction for the patients with unstable ACL-deficient knee with osteoarthritis.

Methods: Twelve patients with a mean age of 46 years (range: 35 - 54) underwent ACL reconstruction for ACL-deficient knee with osteoarthritis.

[Acetabular revision using acetabular reinforcement cages with a hook].

Objective: To evaluate the effects of cementless revising cup or acetabular reinforcement cages for reconstructing the massive acetabular deficiency.

Methods: From September 2001 to September 2008, 22 loosening acetabular cases (24 hips) were revised using cementless revising cup or acetabular reinforcement cases for reconstructing massive bone defect after particulate bone grafting. There were 2 cases (2 hips) using Lima cementless revising cup, 2 cases (2 hips) using Kerboull ring, and 18 cases (20 hips) using restoration GAP cages.

[The etiologies and prevention of patellar instability after un-resurfaced total knee arthroplasty].

Objective: To investigate the etiologies and prevention of patellar instability after total knee arthroplasty (TKA).

Methods: From September 1997 to April 2005, 94 patients (105 knees) underwent TKA without patellar resurfacing. All of them were osteoarthritis.

[Change in the joint line after total knee arthroplasty].

Objective: To investigate the change in joint line after knee arthroplasty.

Methods: A total of 43 patients had 25 primary cruciate-retaining total knee replacements (Link Gemini MKII) and 25 rotational knee replacements (Link Endo-Model Rotational Knee System) sacrificing collateral ligaments and cruciate ligaments. Lateral radiographs were made both preoperatively and postoperatively.