Knee Surg Relat Res.  2020 Mar;32(1):e10. 10.1186/s43019-019-0022-2.

Posterior condylar offset changes and its effect on clinical outcomes after posteriorsubstituting, fixed-bearing total knee arthroplasty: anterior versus posterior referencing

Affiliations
  • 1Department of Orthopaedic Surgery, Seoul National University College of Medicine, SMG-SNU Boramae Medical Center, Seoul, 07061, South Korea
  • 2Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, 03080, South Korea
  • 3Department of Emergency Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, 03080, South Korea
  • 4Department of Physical Medicine and Rehabilitation, College of Medicine, Kyung Hee University, Seoul, 05278, South Korea
  • 5Department of Biostatistics, SMG-SNU Boramae Medical Center, Seoul, 07061, South Korea

Abstract

Background
We sought to determine whether there was a difference in the posterior condylar offset (PCO), posterior condylar offset ratio (PCOR) and clinical outcomes following total knee arthroplasty (TKA) with anterior referencing (AR) or posterior referencing (PR) systems. We also assessed whether the PCO and PCOR changes, as well as patient factors were related to range of motion (ROM) in each referencing system.
Methods
This retrospective study included 130 consecutive patients (184 knees) with osteoarthritis who underwent primary posterior cruciate ligament (PCL)-substituting fixed-bearing TKA. The difference between preoperative and postoperative PCO and PCOR values were calculated. Clinical outcomes including ROM and Western Ontario and McMaster University (WOMAC) scores were evaluated. Furthermore, multiple linear regression analysis was performed to determine the factors related to postoperative ROM in each referencing system.
Results
The postoperative PCO was greater in the AR group (28.4 mm) than in the PR group (27.4 mm), whereas the PCO was more consistently preserved in the PR group. The mean postoperative ROM after TKA was greater in the AR group (129°) than in the PR group (122°), whereas improvement in WOMAC score did not differ between the two groups. Preoperative ROM was the only factor related to postoperative ROM in both groups.
Conclusions
There was no difference in postoperative PCO in AR and PR group and the PCO was not associated with postoperative ROM. PCO was more consistently preserved after surgery in the PR group. The postoperative PCO and PCOR changes did not affect the postoperative ROM. Furthermore, similar clinical outcomes were achieved in the AR and PR groups.

Keyword

Anterior referencing system; Posterior referencing system; Posterior condylar offset; Posterior condylar offset ratio
Full Text Links
  • KSRR
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
Copyright © 2024 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr