Aims. A fracture of the medial tibial plateau is a serious complication of Oxford mobile-bearing unicompartmental knee arthroplasty (OUKA). The risk of these fractures is reportedly lower when using components with a longer keel-cortex distance (KCDs). The aim of this study was to examine how slight varus placement of the tibial component might affect the KCDs, and the rate of tibial plateau fracture, in a clinical setting. Methods. This retrospective study included 255 patients who underwent 305 OUKAs with cementless tibial components. There were 52 males and 203 females. Their mean age was 73.1 years (47 to 91), and the mean follow-up was 1.9 years (1.0 to 2.0). In 217 knees in 187 patients in the conventional group, tibial cuts were made orthogonally to the tibial axis. The varus group included 88 knees in 68 patients, and tibial cuts were made slightly varus using a new osteotomy guide. Anterior and posterior KCDs and the origins of fracture lines were assessed using
Robotic arm-assisted surgery offers accurate and reproducible guidance in component positioning and assessment of soft-tissue tensioning during knee arthroplasty, but the feasibility and early outcomes when using this technology for revision surgery remain unknown. The objective of this study was to compare the outcomes of robotic arm-assisted revision of unicompartmental knee arthroplasty (UKA) to total knee arthroplasty (TKA) versus primary robotic arm-assisted TKA at short-term follow-up. This prospective study included 16 patients undergoing robotic arm-assisted revision of UKA to TKA versus 35 matched patients receiving robotic arm-assisted primary TKA. In all study patients, the following data were recorded: operating time, polyethylene liner size, change in haemoglobin concentration (g/dl), length of inpatient stay, postoperative complications, and hip-knee-ankle (HKA) alignment. All procedures were performed using the principles of functional alignment. At most recent follow-up, range of motion (ROM), Forgotten Joint Score (FJS), and Oxford Knee Score (OKS) were collected. Mean follow-up time was 21 months (6 to 36).Aims
Methods
We used immediate post-operative The bending angles in the sagittal and axial planes were significantly
greater but the coronal-bending angle was significantly less in
the transtibial group than in the anteromedial portal and outside-in
groups (p <
0.001 each). The mean length of the femoral tunnel
in all three planes was significantly greater in the transtibial
group than the anteromedial portal and outside-in groups (p <
0.001 each), but all mean tunnel lengths in the three groups exceeded
30 mm. The only significant difference was the coronal graft- bending
angle in the anteromedial portal and outside-in groups (23.5° Compared with the transtibial technique, the anteromedial portal
and outside-in techniques may reduce the graft-bending stress at
the opening of the femoral tunnel. Despite the femoral tunnel length
being shorter in the anteromedial portal and outside-in techniques
than in the transtibial technique, a femoral tunnel length of more than
30 mm in the anteromedial portal and outside-in techniques may be
sufficient for the graft to heal. Cite this article: