Effects of two different degrees of lateral-wedge insoles on unilateral lower extremity load-bearing line in patients with medial knee osteoarthritis

Abstract

Objective: The aim of this study is to assess the effect of 5 and 10lateral-wedge insoles on unilaterallower extremity load carrying line in patients with medial knee osteoarthritis using the L.A.S.A.R. posturealignment system.Patients and methods: Twenty subjects (10 females and 10 males, mean age 67.7± 5.4 years (range: 58e78) with bilateral medial knee osteoarthritis were included in the study. The laser line projected on theperson by the L.A.S.A.R. posture alignment system showed joint load carrying line. The location of thejoint load carrying line in static standing with one foot on the force plate was assessed with barefoot, and5and 10lateral-wedge insoles. Displacement of the load carrying line was measured using a rulerplaced tangentially to the patella at the level of joint line.Results: The load carrying lines measured with 5and 10lateral-wedge insoles were signiŞcantlylaterally located compared to that without wearing insole (p< 0.001). 10lateral-wedge insole caused asigniŞcant more lateral shifting of the load carrying line than 5lateral-wedge insole (p< 0.001).Conclusion: Both wedge insoles was effective in moving of the unilateral lower extremity load carryingline to the lateral. Lateral wedged insoles are biomechanically effective and reduce loading of the medialcompartment in patients with medial knee osteoarthritis.© 2016 Turkish Association of Orthopaedics and Traumatology. Publishing services by Elsevier B.V. This isan open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)