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A biomechanical comparison between the single-axis and multi-axis total knee arthroplasty systems for the stand-to-sit movement.
Clin Biomech (Bristol, Avon). 2005 May; 20(4):428-33.CB

Abstract

BACKGROUND

Compared to the design of a traditional multi-axis total knee arthroplasty, the single-axis arthroplasty studied has a fixed flexion/extension center of rotation in the femoral component. The influence of this characteristic on functional daily activity, i.e., stand-to-sit, is not well understood. The purpose of this study was to investigate the effect of different arthroplasty designs on knee kinematic and lower limb muscular activation for the stand-to-sit movement.

METHODS

Sixteen unilateral, posterior-stabilized knee arthroplasty participants (8 single-axis and 8 multi-axis) with excellent Knee Society scores performed 4 trials of the stand-to-sit test. Three-dimensional video analysis of whole body and joint kinematics and electromyography analysis of quadriceps and hamstrings were conducted. One-way ANOVAs were used for statistical analyses (alpha=0.05).

FINDINGS

The multi-axis group showed some functional adaptations while sitting down. The single-axis group exhibited less arthroplasty limb quadriceps electromyography and hamstring co-activation electromyography than the multi-axis group. For the arthroplasty limb, single-axis demonstrated less abduction angular displacement and reached peak abduction earlier than the multi-axis arthroplasty limb. The estimated effect size for this study was 0.196.

INTERPRETATION

The single-axis design requires less eccentric knee extensor muscle activation and exhibits greater medio-lateral stability than the multi-axis designs. Findings from this study could provide useful information to orthopedic knee surgeons and rehabilitative specialists.

Authors+Show Affiliations

Wang H
Department of FNES, Queens College, 203 Fitzgerald Gym., Flushing, NY 11367, USA. hewang@forbin.qc.edu
Simpson KJ
No affiliation info available
Chamnongkich S
No affiliation info available
Kinsey T
No affiliation info available
Mahoney OM
No affiliation info available

MeSH

Adaptation, PhysiologicalAgedArthroplasty, Replacement, KneeBiomechanical PhenomenaElectromyographyFemaleHumansKnee JointKnee ProsthesisLower ExtremityMaleMovementMuscle ContractionMuscle, SkeletalPostureRecovery of FunctionTreatment Outcome

Pub Type(s)

Clinical Trial
Controlled Clinical Trial
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15737451

Citation

Wang, H, et al. "A Biomechanical Comparison Between the Single-axis and Multi-axis Total Knee Arthroplasty Systems for the Stand-to-sit Movement." Clinical Biomechanics (Bristol, Avon), vol. 20, no. 4, 2005, pp. 428-33.
Wang H, Simpson KJ, Chamnongkich S, et al. A biomechanical comparison between the single-axis and multi-axis total knee arthroplasty systems for the stand-to-sit movement. Clin Biomech (Bristol, Avon). 2005;20(4):428-33.
Wang, H., Simpson, K. J., Chamnongkich, S., Kinsey, T., & Mahoney, O. M. (2005). A biomechanical comparison between the single-axis and multi-axis total knee arthroplasty systems for the stand-to-sit movement. Clinical Biomechanics (Bristol, Avon), 20(4), 428-33.
Wang H, et al. A Biomechanical Comparison Between the Single-axis and Multi-axis Total Knee Arthroplasty Systems for the Stand-to-sit Movement. Clin Biomech (Bristol, Avon). 2005;20(4):428-33. PubMed PMID: 15737451.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A biomechanical comparison between the single-axis and multi-axis total knee arthroplasty systems for the stand-to-sit movement. AU - Wang,H, AU - Simpson,K J, AU - Chamnongkich,S, AU - Kinsey,T, AU - Mahoney,O M, Y1 - 2005/01/19/ PY - 2004/06/23/received PY - 2004/11/15/revised PY - 2004/12/08/accepted PY - 2005/3/2/pubmed PY - 2005/6/25/medline PY - 2005/3/2/entrez SP - 428 EP - 33 JF - Clinical biomechanics (Bristol, Avon) JO - Clin Biomech (Bristol, Avon) VL - 20 IS - 4 N2 - BACKGROUND: Compared to the design of a traditional multi-axis total knee arthroplasty, the single-axis arthroplasty studied has a fixed flexion/extension center of rotation in the femoral component. The influence of this characteristic on functional daily activity, i.e., stand-to-sit, is not well understood. The purpose of this study was to investigate the effect of different arthroplasty designs on knee kinematic and lower limb muscular activation for the stand-to-sit movement. METHODS: Sixteen unilateral, posterior-stabilized knee arthroplasty participants (8 single-axis and 8 multi-axis) with excellent Knee Society scores performed 4 trials of the stand-to-sit test. Three-dimensional video analysis of whole body and joint kinematics and electromyography analysis of quadriceps and hamstrings were conducted. One-way ANOVAs were used for statistical analyses (alpha=0.05). FINDINGS: The multi-axis group showed some functional adaptations while sitting down. The single-axis group exhibited less arthroplasty limb quadriceps electromyography and hamstring co-activation electromyography than the multi-axis group. For the arthroplasty limb, single-axis demonstrated less abduction angular displacement and reached peak abduction earlier than the multi-axis arthroplasty limb. The estimated effect size for this study was 0.196. INTERPRETATION: The single-axis design requires less eccentric knee extensor muscle activation and exhibits greater medio-lateral stability than the multi-axis designs. Findings from this study could provide useful information to orthopedic knee surgeons and rehabilitative specialists. SN - 0268-0033 UR - https://www.unboundmedicine.com/medline/citation/15737451/A_biomechanical_comparison_between_the_single_axis_and_multi_axis_total_knee_arthroplasty_systems_for_the_stand_to_sit_movement_ DB - PRIME DP - Unbound Medicine ER -