Toggle Main Menu Toggle Search

Open Access padlockePrints

Length Change Patterns of the Extensor Retinaculum and the Effect of Total Knee Replacement

Lookup NU author(s): Professor David Deehan


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Patellofemoral dysfunction following total knee replacement TKR) is a significant clinical problem, but little information exists on the mechanics of the patellofemoral retinacula or the effects of TKR on these structures. We hypothesized that TKR would cause significant elongation of the retinacula. Retinacular length changes were measured by threading sutures along the retinacula, fixing the sutures to the patella and the iliotibial band (ITB), and attaching the femoral ends to displacement transducers. The intact knee was flexed-extended while the quadriceps and ITB were tensed and the retinacular length change patterns were recorded. The measurements were repeated post-TKR. The medial patellofemoral ligament (MPFL) was close to isometric, stretching 2 turn in terminal knee extension, whereas the lateral retinaculum slackened 8 mm from 110 degrees to 0 degrees flexion. TKR (lid not cause significant elongation of either of the retinacula, the largest change being 3 mm elongation of the MPFL around 40, which stretched the MPFL by 1.4 mm above its maximum natural length. Thus, this work did not support the hypothesis that TKR causes significant elongation of the retinacula sufficient to affect knee function. (C) 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27:865-870, 2009

Publication metadata

Author(s): Ghosh KM, Merican AM, Iranpour-Boroujeni F, Deehan DJ, Amis AA

Publication type: Article

Publication status: Published

Journal: Journal of Orthopaedic Research

Year: 2009

Volume: 27

Issue: 7

Pages: 865-870

ISSN (print): 0736-0266

ISSN (electronic): 1554-527X

Publisher: John Wiley & Sons, Inc.


DOI: 10.1002/jor.20827


Altmetrics provided by Altmetric