In-situ force in the medial and lateral structures of intact and ACL-deficient knees |
| |
Authors: | Akihiro Kanamori Masataka Sakane Jennifer Zeminski Theodore W Rudy Savio L-Y Woo |
| |
Institution: | (1) Musculoskeletal Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, E1641 Biomedical Science Tower, 210 Lothrop St., P.O. Box 71199, Pittsburgh, PA 15213, USA, US |
| |
Abstract: | The anterior cruciate ligament (ACL) is the major contributor to limit excessive anterior tibial translation (ATT) when the
knee is subjected to an anterior tibial load. However, the importance of the medial and lateral structures of the knee can
also play a significant role in resisting anterior tibial loads, especially in the event of an ACL injury. Therefore, the
objective of this study was to determine quantitatively the increase in the in-situ forces in the medial collateral ligament
(MCL) and posterolateral structures (PLS) of the knee associated with ACL deficiency. Eight fresh-frozen cadaveric human knees
were subjected to a 134-N anterior tibial load at full extension and at 15°, 30°, 60°, and 90° of knee flexion. The resulting
5 degrees of freedom kinematics were measured for the intact and the ACL-deficient knees. A robotic/universal force-moment
sensor testing system was used for this purpose, as well as to determine the in-situ force in the MCL and PLS in the intact
and ACL-deficient knees. For the intact knee, the in-situ forces in both the MCL and PLS were less than 20 N for all five
flexion angles tested. But in the ACL-deficient knee, the in-situ forces in the MCL and PLS, respectively, were approximately
two and five times as large as those in the intact knee (P < 0.05). The results of this study demonstrate that, although both the MCL and PLS play only a minor role in resisting anterior
tibial loads in the intact knee, they become significant after ACL injury.
Received: December 3, 1999 / Accepted: July 19, 2000 |
| |
Keywords: | Anterior cruciate ligament Medial collateral ligament Posterolateral structures In-situ force |
本文献已被 ScienceDirect SpringerLink 等数据库收录! |
|