Perceived Instability Is Associated With Strength and Pain, Not Frontal Knee Laxity, in Patients With Advanced Knee Osteoarthritis
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Authors
Chaudhari, Ajit M.W.
Schmitt, Laura C.
Freisinger, Gregory
Lewis, Jacqueline
Hutter, Erin E.
Pan, Xueliang
Siston, Robert A.
Issue Date
2019-07
Type
journal-article
Language
Keywords
Osteoarthritis
Alternative Title
Abstract
Background
Increased varus/valgus laxity and perceived knee instability are independently associated with poor outcomes in people with knee osteoarthritis. However, the relationship between laxity and perceived instability is unclear.
Objective
To assess whether knee extensor strength, pain, and knee laxity are related to perceived knee instability in patients with advanced knee osteoarthritis.
Methods
This was a secondary analysis of a prospective observational cohort study of 35 patients (24 female; mean ± SD age, 60 ± 8 years; body mass index, 33 ± 5 kg/m2) with knee osteoarthritis awaiting total knee arthroplasty (36 knees). Within 1 month before arthroplasty, we measured isometric knee extension strength and self-reported knee pain (using the Knee injury and Osteoarthritis Outcome Score pain subscale). Patients rated their perception of knee instability as moderate to severe (n = 20) or slight to none (n = 15 patients, n = 16 knees) using the Knee Outcome Survey. We measured intraoperative varus/valgus knee laxity.
Results
Lower knee extension strength (P = .01) and greater pain (P<.01) were associated with the perception of moderate to severe knee instability. Laxity was not related to perceived knee instability (P = .63).
Conclusion
Knee extension strength and pain were associated with perceived instability in people with advanced osteoarthritis. Varus/valgus laxity was not related to perceived knee instability.
Level of Evidence
Level 2, prognostic. J Orthop Sports Phys Ther 2019;49(7):513–517. doi:10.2519/jospt.2019.8619
Description
Citation
Perceived Instability Is Associated With Strength and Pain, Not Frontal Knee Laxity, in Patients With Advanced Knee Osteoarthritis Ajit M.W. Chaudhari, Laura C. Schmitt, Gregory M. Freisinger, Jacqueline M. Lewis, Erin E. Hutter, Xueliang Pan, and Robert A. Siston Journal of Orthopaedic & Sports Physical Therapy 2019 49:7, 513-517
Publisher
Journal of Orthopaedic & Sports Physical Therapy (JOSPT)
License
Journal
Volume
Issue
PubMed ID
ISSN
0190-6011
1938-1344
1938-1344