Accuracy of acetabular cup placement during anterolateral supine total hip arthroplasty using intraoperative fluoroscopy: a retrospective study.

Background: In our institution, total hip arthroplasty (THA) is performed using the anterolateral supine (ALS) approach with intraoperative fluoroscopy. This study aimed to investigate and review the accuracy of acetabular cup placement in ALS-THA using intraoperative fluoroscopy.

Methods: A total of 142 patients with 154 joints (mean age 64.

MRI Findings of Muscle Damage after Total Hip Arthroplasty Using the Complete Muscle Preserving Anterolateral Supine Approach.

We performed anterolateral total hip arthroplasty (ALS THA) with the purpose of complete muscle-tendon preservation without muscle-tendon dissection. This study aimed to evaluate muscle damage in the periprosthetic hip joint muscles of patients undergoing ALS THA at 1-year post-operative hip magnetic resonance imaging (MRI). We evaluated changes in the muscle cross-sectional area (M-CSA) and fatty atrophy of the periprosthetic muscles.

Medial meniscal extrusion and spontaneous osteonecrosis of the knee.

Purpose: Causes of spontaneous osteonecrosis of the knee (SONK) have not been clearly elucidated. This study investigated the relationship between medial meniscal extrusion and SONK.

Methods: We reviewed 108 SONK knees and determined their Aglietti stage.

Suppression of cartilage degeneration by intra-articular injection of heparan sulfate 6-O endosulfatase in a mouse osteoarthritis model.

We previously reported that heparan sulfate 6-O endosulfatases (Sulfs) were expressed in articular cartilage, and that the Sulf-1 knockout mouse developed severe knee osteoarthritis. In this study, we hypothesised that intra-articular injection of Sulf-1 would prevent cartilage degeneration. After confirming that 1 mg/ml Sulf-1 did not induce ATDC5 cell death in vitro, gene expression of type II collagen and matrix metalloproteinase (MMP)-13 in the presence of Sulf-1 (1 100 ng/ml) were determined by quantitative real-time polymerase chain reaction.

Chondrocyte clusters adjacent to sites of cartilage degeneration have characteristics of progenitor cells.

The purpose of this study was to investigate the site-specific characteristics and roles of chondrocyte clusters in human knee osteoarthritis. Cartilage explants were obtained from 45 knees undergoing total knee replacement surgery. The explants were taken from 4 locations in the knee: the medial femoral condyle, the medial posterior femoral condyle (MPC), the lateral femoral condyle, and the lateral posterior femoral condyle (LPC).

A new method for meniscus repair using type I collagen scaffold and infrapatellar fat pad.

Aim: The aim of this study was to investigate a new method for meniscal repair by combinative transplantation with type I collagen scaffold and infrapatellar fat pad.

Methods: Two-mm cylindrical defects at the anterior part of bilateral medial menisci were prepared in nine Japanese white rabbits. The 18 knees were equally divided into three groups: I, no treatment; II, collagen scaffold transplantation; and III, collagen scaffold and infrapatellar fat pad transplantation.

Correlation between varus knee malalignment and patellofemoral osteoarthritis.

Purpose: To evaluate the relationship between patellofemoral osteoarthritis (OA) and varus OA of the knee with a focus on the location of joint space narrowing.

Methods: Eighty-five patients scheduled to undergo total knee arthroplasty caused by varus OA were enrolled in this study. The relationship between patellofemoral OA and varus knee malalignment was elucidated.

Three-dimensional transfer of the tibial tuberosity for patellar instability with patella alta.

Background: Although patellar instability can be treated with several surgical procedures, the appropriate surgical treatment for patellar instability with patella alta has not yet been investigated. The objective of this study is to find out whether three-dimensional transfer of the tibial tuberosity elicits good knee functionality with improved patella alta and prevents further patellar dislocation.

Methods: Twelve knees (10 patients) underwent surgery for patellar instability with patella alta from 2007 to 2011.