Sit-to-Stand 3 months after unilateral total knee arthroplasty

Comparison of self-selected and constrained conditions

Sara J. Farquhar, Kenton R Kaufman, Lynn Snyder-Mackler

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

After unilateral total knee arthroplasty (TKA), rehabilitation specialists often constrain knee angles or foot positions during sit-to-stand, to encourage increased weight bearing through the operated limb. Biomechanical studies often constrain limb position during sit-to-stand in an effort to reduce variability. Differences between self-selecting or constraining position are unknown in persons after TKA. Twenty-six subjects with unilateral TKA participated in motion analysis. Subjects performed the sit-to-stand using a self-selected position (ssSTS); next, trials were collected in a constrained condition (ccSTS), where both knees were positioned with the tibia vertical, perpendicular to the floor. Repeated measures ANOVA (limb × condition) assessed differences between limbs and between conditions. Subjects used greater hip flexion bilaterally during ccSTS (91°) compared to ssSTS (87°; p = 0.001) and knee flexion on the non-operated limb was greater during ssSTS (84°) compared to ccSTS (82°; p = 0.018). The ccSTS resulted in larger extensor moments on the non-operated limb at the hip (ssSTS -0.473, ccSTS -0.521; p = 0.021) and knee (ssSTS -0.431, ccSTS -0.457; p = 0.001) compared to the operated limb. The ccSTS exacerbated the asymmetries at the hip and knee compared to ssSTS, and did not improve use of the operated limb. Reliance on the non-operated limb may put them at risk for progression of osteoarthritis in other joints of the lower extremities.

Original languageEnglish (US)
Pages (from-to)187-191
Number of pages5
JournalGait and Posture
Volume30
Issue number2
DOIs
StatePublished - Aug 2009

Fingerprint

Knee Replacement Arthroplasties
Extremities
Knee
Hip
Weight-Bearing
Tibia
Osteoarthritis
Foot
Lower Extremity
Analysis of Variance
Rehabilitation
Joints

Keywords

  • Altered movement pattern
  • Sit-to-stand
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Rehabilitation

Cite this

Sit-to-Stand 3 months after unilateral total knee arthroplasty : Comparison of self-selected and constrained conditions. / Farquhar, Sara J.; Kaufman, Kenton R; Snyder-Mackler, Lynn.

In: Gait and Posture, Vol. 30, No. 2, 08.2009, p. 187-191.

Research output: Contribution to journalArticle

@article{2bfce5bcbf5148a3bf0c9fd033538c86,
title = "Sit-to-Stand 3 months after unilateral total knee arthroplasty: Comparison of self-selected and constrained conditions",
abstract = "After unilateral total knee arthroplasty (TKA), rehabilitation specialists often constrain knee angles or foot positions during sit-to-stand, to encourage increased weight bearing through the operated limb. Biomechanical studies often constrain limb position during sit-to-stand in an effort to reduce variability. Differences between self-selecting or constraining position are unknown in persons after TKA. Twenty-six subjects with unilateral TKA participated in motion analysis. Subjects performed the sit-to-stand using a self-selected position (ssSTS); next, trials were collected in a constrained condition (ccSTS), where both knees were positioned with the tibia vertical, perpendicular to the floor. Repeated measures ANOVA (limb × condition) assessed differences between limbs and between conditions. Subjects used greater hip flexion bilaterally during ccSTS (91°) compared to ssSTS (87°; p = 0.001) and knee flexion on the non-operated limb was greater during ssSTS (84°) compared to ccSTS (82°; p = 0.018). The ccSTS resulted in larger extensor moments on the non-operated limb at the hip (ssSTS -0.473, ccSTS -0.521; p = 0.021) and knee (ssSTS -0.431, ccSTS -0.457; p = 0.001) compared to the operated limb. The ccSTS exacerbated the asymmetries at the hip and knee compared to ssSTS, and did not improve use of the operated limb. Reliance on the non-operated limb may put them at risk for progression of osteoarthritis in other joints of the lower extremities.",
keywords = "Altered movement pattern, Sit-to-stand, Total knee arthroplasty",
author = "Farquhar, {Sara J.} and Kaufman, {Kenton R} and Lynn Snyder-Mackler",
year = "2009",
month = "8",
doi = "10.1016/j.gaitpost.2009.04.007",
language = "English (US)",
volume = "30",
pages = "187--191",
journal = "Gait and Posture",
issn = "0966-6362",
publisher = "Elsevier",
number = "2",

}

TY - JOUR

T1 - Sit-to-Stand 3 months after unilateral total knee arthroplasty

T2 - Comparison of self-selected and constrained conditions

AU - Farquhar, Sara J.

AU - Kaufman, Kenton R

AU - Snyder-Mackler, Lynn

PY - 2009/8

Y1 - 2009/8

N2 - After unilateral total knee arthroplasty (TKA), rehabilitation specialists often constrain knee angles or foot positions during sit-to-stand, to encourage increased weight bearing through the operated limb. Biomechanical studies often constrain limb position during sit-to-stand in an effort to reduce variability. Differences between self-selecting or constraining position are unknown in persons after TKA. Twenty-six subjects with unilateral TKA participated in motion analysis. Subjects performed the sit-to-stand using a self-selected position (ssSTS); next, trials were collected in a constrained condition (ccSTS), where both knees were positioned with the tibia vertical, perpendicular to the floor. Repeated measures ANOVA (limb × condition) assessed differences between limbs and between conditions. Subjects used greater hip flexion bilaterally during ccSTS (91°) compared to ssSTS (87°; p = 0.001) and knee flexion on the non-operated limb was greater during ssSTS (84°) compared to ccSTS (82°; p = 0.018). The ccSTS resulted in larger extensor moments on the non-operated limb at the hip (ssSTS -0.473, ccSTS -0.521; p = 0.021) and knee (ssSTS -0.431, ccSTS -0.457; p = 0.001) compared to the operated limb. The ccSTS exacerbated the asymmetries at the hip and knee compared to ssSTS, and did not improve use of the operated limb. Reliance on the non-operated limb may put them at risk for progression of osteoarthritis in other joints of the lower extremities.

AB - After unilateral total knee arthroplasty (TKA), rehabilitation specialists often constrain knee angles or foot positions during sit-to-stand, to encourage increased weight bearing through the operated limb. Biomechanical studies often constrain limb position during sit-to-stand in an effort to reduce variability. Differences between self-selecting or constraining position are unknown in persons after TKA. Twenty-six subjects with unilateral TKA participated in motion analysis. Subjects performed the sit-to-stand using a self-selected position (ssSTS); next, trials were collected in a constrained condition (ccSTS), where both knees were positioned with the tibia vertical, perpendicular to the floor. Repeated measures ANOVA (limb × condition) assessed differences between limbs and between conditions. Subjects used greater hip flexion bilaterally during ccSTS (91°) compared to ssSTS (87°; p = 0.001) and knee flexion on the non-operated limb was greater during ssSTS (84°) compared to ccSTS (82°; p = 0.018). The ccSTS resulted in larger extensor moments on the non-operated limb at the hip (ssSTS -0.473, ccSTS -0.521; p = 0.021) and knee (ssSTS -0.431, ccSTS -0.457; p = 0.001) compared to the operated limb. The ccSTS exacerbated the asymmetries at the hip and knee compared to ssSTS, and did not improve use of the operated limb. Reliance on the non-operated limb may put them at risk for progression of osteoarthritis in other joints of the lower extremities.

KW - Altered movement pattern

KW - Sit-to-stand

KW - Total knee arthroplasty

UR - http://www.scopus.com/inward/record.url?scp=67649599114&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67649599114&partnerID=8YFLogxK

U2 - 10.1016/j.gaitpost.2009.04.007

DO - 10.1016/j.gaitpost.2009.04.007

M3 - Article

VL - 30

SP - 187

EP - 191

JO - Gait and Posture

JF - Gait and Posture

SN - 0966-6362

IS - 2

ER -