Osteoarthritis Research Today is a free monthly online journal that collates and summarizes the latest research about Osteoarthritis, including details on treatment, symptoms, causes, medication. | ||||||||
|
Inconsistent knee varus moment reduction caused by a lateral wedge in knee osteoarthritis.Kakihana W, Akai M, Nakazawa K, Naito K, Torii S Department of Rehabilitation for Movement Functions, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan. OBJECTIVE: To determine--with the assistance of a larger sample size--whether the inconsistency of reducing the knee-joint varus moment with a lateral wedge in patients with medial compartment knee osteoarthritis (OA) persists and if so, what underlying mechanisms may explain it. DESIGN: Crossover design whereby 51 patients with bilateral isolated medial compartment knee OA and 19 age-matched healthy controls walked with two different wedge conditions: a 0-degree control wedge and a 6-degree lateral wedge. We conducted three-dimensional motion analysis, hip-knee-ankle (HKA) angle measurement, and radiologic assessment with Kellgren-Lawrence grade. We investigated frontal plane angles and moments at the knee and subtalar joints, ground reaction forces, and center of pressure (CoP). Moments were derived using a three-dimensional inverse dynamics model of the lower extremity. RESULTS: Nine patients (17.6%) had an increased knee-joint varus moment with the 6-degree lateral wedge via the medially shifted location of the CoP. These patients did not differ from the remaining patients in HKA angle and radiologic assessment. CONCLUSION: In approximately 18% of patients with bilateral medial compartment knee OA, the 6-degree lateral wedge seems to fail to reduce the knee-joint varus moment. The indication and limitations of lateral wedge should be confirmed by a randomized controlled study. Published 22 May 2007 in Am J Phys Med Rehabil, 86(6): 446-54.
© 2004-2008 Osteoarthritis Research Today. All Rights Reserved. |
| ||||||
