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Arch Phys Med Rehabil. 2005 Jul;86(7):1465-71.

Effects of laterally wedged insoles on knee and subtalar joint moments.

Author information

  • 1Department of Rehabilitation for Movement Functions, Research Institute of National Rehabiltaion Center for Persons with Disabilities, Tokorozawa, Japan. kaki@rehab.go.jp

Abstract

OBJECTIVE:

To assess the biomechanic effects of wearing a lateral wedge on the knee joint varus moment during gait in elders with and without knee osteoarthritis (OA).

DESIGN:

Crossover design whereby subjects walked under 2 different insole conditions: a 0 degrees control wedge and a 6 degrees lateral wedge.

SETTING:

A gait laboratory with 3-dimensional motion analysis and force platform equipment.

PARTICIPANTS:

Thirteen healthy subjects and 13 knee patients with OA.

INTERVENTIONS:

Not applicable.

MAIN OUTCOME MEASURES:

Frontal plane angles and moments at the knee and subtalar joints, ground reaction forces, and center of pressure. Moments were derived by using a 3-dimensional inverse dynamics model of the lower extremity.

RESULTS:

The 6 degrees lateral wedge significantly reduced knee joint varus moment and increased subtalar joint valgus moment in both groups when compared with no wedge. All patients had a greater knee joint varus moment with a similar subtalar joint valgus moment compared with the people without OA. There were diverse, sometimes reversed effects with the insole among the patients.

CONCLUSIONS:

The 6 degrees lateral wedge did not consistently reduce the knee joint varus moment in patients with knee OA. The biomechanic indications and limitations of laterally wedged insoles should be confirmed by a larger study.

PMID:
16003682
[PubMed - indexed for MEDLINE]
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