The use of computer navigation is becoming a well-recognized technical alternative to conventional total knee arthroplasty (TKA). However, computer navigation has a substantial learning curve and the use of commercially available navigation systems increases surgical time. In addition, the potential risks associated with the navigation TKA, such as, registration errors, notching of the anterior...

Background: The purpose of this study was to examine the mid-term functional outcomes, radiographic results,and revision rates of patients treated with the Delta Xtend Reverse Shoulder System for both primary and revisionarthroplasty indications.Methods: A retrospective review was conducted of records for all individuals who underwent a reverse shoulderarthroplasty using the Delta Xtend Reverse...

当院にてリバース型人工肩関節置換術（RSA）を施行した53例55肩に対し，RSA合併症の一つであるscapular notchingの発生頻度を調査した．また，notchingあり群となし群に分け，年齢，性別，BMI，観察期間，機種別（In-layとOn-lay），術後臨床成績，肩関節自動可動域について両群間で比較検討した．scapular notchingの発生頻度は8肩（14.5％）であり，年齢，性別，BMI，術後経過観察期間において差を認めなかった．In-lay type 22肩中5肩（22.7％），On-lay 33肩中3肩（9.1％）に認め，機種間での発生に差を認めなかった．また，両群ともJOAスコア，肩関節自動屈曲・外転では術前後で改善を認めたが，内外旋では変化を認めなかった．群間比較では，術前後のJOAスコア，肩関節自動可動域に変化を認めなかった．