Mechanical energy efficiency for stepping up and down in persons with medial knee osteoarthritis.

Abstract:

BACKGROUND:Energetic cost contributes to movement impairments observed during stair negotiation in persons with knee osteoarthritis. Specifically, the intersegmental mechanical energy exchange may be diminished in the presence of pathologies. RESEARCH QUESTION:The purpose of this study was to evaluate mechanical energy efficiency in persons with knee osteoarthritis during stepping up and down based on mechanical energy analysis. METHODS:Sixteen patients with medial knee osteoarthritis and 16 age-matched controls participated. A three-dimensional motion analysis system and force platforms were used to acquire biomechanical data. The participants were instructed to ascend/descend a 2-step staircase. The mechanical power exhibited during the stance phase at the lower step of the staircase were computed. Mechanical Energy Expenditure (MEE) was calculated as the integral of net joint power at each joint. Mechanical Energy Compensation (MEC) was defined as the proportion of muscle energy compensated by inter-segmental energy transfer. According to energy transfer modes, MEE and MEC were determined separately as three phases: concentric and eccentric transfer phases and no-transfer phase. RESULTS:While stepping up, the patient group performed the task with less MEC at the ankle joint, which was observed prior to push-off. The patient group displayed less mechanical energy transfer from the shank to the foot segment. The concentric MEC at the hip joint in the late-stance phase of stepping down was lower in the patient group, which meant patients demonstrated less mechanical energy transfer from the pelvis to the thigh segment. SIGNIFICANCE:It was disclosed that persons with knee osteoarthritis demonstrated less mechanical energy transfer while stepping up and down.

journal_name

Gait Posture

journal_title

Gait & posture

authors

Koyama Y,Tateuchi H,Araki K,Fujita K,Umehara J,Kobayashi M,Ichihashi N

doi

10.1016/j.gaitpost.2019.01.009

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

143-149

eissn

0966-6362

issn

1879-2219

pii

S0966-6362(19)30026-8

journal_volume

69

pub_type

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