Design modifications of high-flexion TKA do not improve short term clinical and radiographic outcomes.

Background: The prosthesis of contemporary total knee arthroplasty (TKA) has been modified to provide a more familiar environment for higher flexion angle of the replaced knee. The design modifications continue based on evidence reported in the literature. However, whether these modifications of the prosthesis design lead to improvements in clinical results needs further investigation.

Effect of combined sex hormone replacement on bone/cartilage turnover in a murine model of osteoarthritis.

Background: Estrogens act on estrogen receptors distributed in articular cartilages, synovial membrane, and ligaments, which are thought to be related with degenerative changes. Meanwhile, progesterone is known to have a weak anabolic action on bone formation This study evaluates the effects of estrogen and progesterone hormone on bone/cartilage turnover in ovariectomized (OVX) rats.

Methods: Thirty-five 7-month-old female Sprague-Dawley rats were randomly divided into 5 groups and then ovariectomized bilaterally except the sham control group.

Skin-capsular Mismatch According to Knee Positions for Instrument Insertion via Arthroscopic Portals.

Damage to soft tissues, chondral surfaces, and the menisci may result from imprise or overly aggressive establishment of portals in arthroscopic knee surgeries. In this note, we address the relationship between the skin and the capsule at portal sites according to knee positions. Understanding the skin-capsular mismatch may facilitate arthroscopic procedures and indirectly reduce the operation time.

Reliability of a PowerPoint method for wear measurement after total hip arthroplasty: a retrieval study using 3-dimensional laser scanning.

The purpose of this study was to evaluate the reliability of the PowerPoint (PP) (2007 Version; Microsoft, Redmond, Wash) method for measuring polyethylene liner wear after total hip arthroplasty. Seventeen retrieved polyethylene liners were included in this study. Wear volumes were calculated using the PP, the Dorr and Wan, and 3-dimensional (3D) laser scanning methods.