Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 20, Issue 6, pp 1110–1117

Muscle strength and functional performance in patients at high risk of knee osteoarthritis: a follow-up study

Authors

    • Institute of Sports Science and Clinical BiomechanicsUniversity of Southern Denmark
  • Per Aagaard
    • Institute of Sports Science and Clinical BiomechanicsUniversity of Southern Denmark
  • Ewa M. Roos
    • Institute of Sports Science and Clinical BiomechanicsUniversity of Southern Denmark
Knee

DOI: 10.1007/s00167-011-1719-2

Cite this article as:
Thorlund, J.B., Aagaard, P. & Roos, E.M. Knee Surg Sports Traumatol Arthrosc (2012) 20: 1110. doi:10.1007/s00167-011-1719-2

Abstract

Purpose

To investigate whether changes from 2 to 4 years post arthroscopic partial meniscectomy (APM) in mechanical muscle function and objectively measured function differ between the operated and contra-lateral leg of APM patients or compared with controls.

Methods

Twenty-two patients (age 46.6 ± 5.0, BMI 24.7 ± 2.9) and 25 controls (age 46.4 ± 5.2, BMI 25.1 ± 4.6) previously examined at ~2 years post APM were examined again at ~4 years post surgery for maximal knee extensor/flexor voluntary contraction (MVC) and rapid force capacity. Functional performance was assessed by the distance achieved during a one-leg hop test and the maximum number of knee bends performed in 30 s. The Knee Injury and Osteoarthritis Outcome Score (KOOS) was used to evaluate self-reported outcomes.

Results

Overall changes from 2 to 4 years post APM did not differ in maximal muscle strength, rapid force capacity, and functional performance between the operated and contra-lateral leg of patients or control legs. However, secondary analysis showed a difference in change in knee extensor MVC resulting in a 6% difference between the operated and contra-lateral leg of patients at follow-up.

Conclusions

No differences in longitudinal changes were observed from 2 to 4 years post APM between patients and controls. The secondary finding of differential changes over time in knee extensor MVC between the operated and contra-lateral leg partly confirm our hypothesis that differences in muscle strength may evolve from 2 to 4 years post APM. This differential change may represent an initial sign of an evolving lower limb muscle asymmetry, which may play a role in the development of knee OA.

Level of evidence

III.

Keywords

Knee jointOsteoarthritisKOOSLongitudinalNeuromuscular

Copyright information

© Springer-Verlag 2011