The purpose of this study is to compare the mid-term outcomes between rotating platform(RP) and posterior cruciate substitute(PS) bearings in LCS-total knee arthroplasty (TKA). This is a prospective randomized matched-pairs case–control study of patients who underwent primary TKAs with a minimum 2 years follow-up. The inclusion criteria was degenerative arthritis, and exclusion criteria was arthritis other than degeneration, previous operations such as osteotomy, body mass index (BMI) over 30 kg/m2. The matching criteria were set as age, BMI, preoperative ROM, gender, and the Knee Society (KS) and Hospital for Special Surgery (HSS) scores. After 1:1 matching, 50 cases involved the LCS RP bearing system as group 1 and 50 cases involved LCS PS bearing system group as group 2. Clinical and radiographic outcomes were evaluated.Purpose
Methods
The range of motion (ROM) obtained after total knee arthroplasty (TKA) is an important measurement to evaluate the postoperative outcomes impacting other measures such as postoperative function and satisfaction. Flexion contracture is a recognized complication of TKA, which reduces ROM or stability and is a source of morbidity for patients. The purpose of this study was to evaluate the influence of intra-operative soft tissue release on correction of flexion contracture in navigated TKA.Introduction
Objectives
Between March 1990 and May 1991 we performed 85 primary total hip replacements in 74 patients using the Landos Atoll hydroxyapatite (HA)-coated cup and the Corail HA-coated stem. The patients were followed up for a mean of ten years. Of the 85 cups, 26 (31%) have already been revised and a further six are radiologically unstable and awaiting revision. Two femoral stems have been revised for infection without loosening. The retrieved acetabular cups were studied by SEM and image-processing techniques to quantify the amount of residual HA on the cup. This was correlated with the clinical variables and modes of failure. The residual HA (as a percentage of the surface) on the loose cups correlated negatively with the duration of implantation (r = −0.732, p <
0.001). Six cups were stable at revision and had more residual HA coating than those which were loose (p <
0.01). The rate of failure of the Landos Atoll HA-coated, smooth hemispherical cup with screw fixation is unacceptably high. Resorption of the HA coating is markedly increased in loose cups compared with stable cups. HA coating cannot substitute for stable mechanical fixation.
