Pelvic movement strategies and leg extension power in patients with end-stage medial compartment knee osteoarthritis: a cross-sectional study

TY - JOUR

T1 - Pelvic movement strategies and leg extension power in patients with end-stage medial compartment knee osteoarthritis

T2 - a cross-sectional study

AU - Kierkegaard, Signe

AU - Jørgensen, Peter Bo

AU - Dalgas, Ulrik

AU - Søballe, Kjeld

AU - Mechlenburg, Inger

PY - 2015/9

Y1 - 2015/9

N2 - INTRODUCTION: During movement tasks, patients with medial compartment knee osteoarthritis use compensatory strategies to minimise the joint load of the affected leg. Movement strategies of the knees and trunk have been investigated, but less is known about movement strategies of the pelvis during advancing functional tasks, and how these strategies are associated with leg extension power. The aim of the study was to investigate pelvic movement strategies and leg extension power in patients with end-stage medial compartment knee osteoarthritis compared with controls.MATERIALS AND METHODS: 57 patients (mean age 65.6 years) scheduled for medial uni-compartmental knee arthroplasty, and 29 age and gender matched controls were included in this cross-sectional study. Leg extension power was tested with the Nottingham Leg Extension Power-Rig. Pelvic range of motion was derived from an inertia-based measurement unit placed over the sacrum bone during walking, stair climbing and stepping.RESULTS: Patients had lower leg extension power than controls (20-39 %, P < 0.01) and used greater pelvic range of motion during stair and step ascending and descending (P ≤ 0.03, except for pelvic range of motion in the frontal plane during ascending, P > 0.06). Furthermore, an inverse association (coefficient: -0.03 to -0.04; R (2) = 13-22 %) between leg extension power and pelvic range of motion during stair and step descending was found in the patients.CONCLUSIONS: Compared to controls, patients with medial compartment knee osteoarthritis use greater pelvic movements during advanced functional performance tests, particularly when these involve descending tasks. Further studies should investigate if it is possible to alter these movement strategies by an intervention aimed at increasing strength and power for the patients.

AB - INTRODUCTION: During movement tasks, patients with medial compartment knee osteoarthritis use compensatory strategies to minimise the joint load of the affected leg. Movement strategies of the knees and trunk have been investigated, but less is known about movement strategies of the pelvis during advancing functional tasks, and how these strategies are associated with leg extension power. The aim of the study was to investigate pelvic movement strategies and leg extension power in patients with end-stage medial compartment knee osteoarthritis compared with controls.MATERIALS AND METHODS: 57 patients (mean age 65.6 years) scheduled for medial uni-compartmental knee arthroplasty, and 29 age and gender matched controls were included in this cross-sectional study. Leg extension power was tested with the Nottingham Leg Extension Power-Rig. Pelvic range of motion was derived from an inertia-based measurement unit placed over the sacrum bone during walking, stair climbing and stepping.RESULTS: Patients had lower leg extension power than controls (20-39 %, P < 0.01) and used greater pelvic range of motion during stair and step ascending and descending (P ≤ 0.03, except for pelvic range of motion in the frontal plane during ascending, P > 0.06). Furthermore, an inverse association (coefficient: -0.03 to -0.04; R (2) = 13-22 %) between leg extension power and pelvic range of motion during stair and step descending was found in the patients.CONCLUSIONS: Compared to controls, patients with medial compartment knee osteoarthritis use greater pelvic movements during advanced functional performance tests, particularly when these involve descending tasks. Further studies should investigate if it is possible to alter these movement strategies by an intervention aimed at increasing strength and power for the patients.

KW - Aged

KW - Case-Control Studies

KW - Cross-Sectional Studies

KW - Female

KW - Humans

KW - Lower Extremity

KW - Male

KW - Movement

KW - Muscle Strength

KW - Osteoarthritis, Knee

KW - Pelvis

KW - Range of Motion, Articular

KW - Walking

KW - Journal Article

KW - Research Support, Non-U.S. Gov't

U2 - 10.1007/s00402-015-2276-9

DO - 10.1007/s00402-015-2276-9

M3 - Journal article

C2 - 26141537

SN - 0936-8051

VL - 135

SP - 1217

EP - 1226

JO - Archives of Orthopaedic and Trauma Surgery

JF - Archives of Orthopaedic and Trauma Surgery

IS - 9

ER -