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Kinematic analysis of functional lower body perturbations.
Clin Biomech (Bristol, Avon). 2004 Dec; 19(10):1032-9.CB

Abstract

BACKGROUND

Sudden changes in direction on a single weight-bearing-limb are commonly associated with injury to the lower extremity. The purposes of this study were to assess the between day reliability of hip, knee, and ankle kinematic displacements achieved with internal and external femur-on-weight-bearing-tibia rotation perturbations and to determine the effect of these perturbations on three dimensional hip, knee and ankle kinematics.

METHODS

Twenty recreationally active, healthy college students with no history of significant orthopedic injury (10 male, 10 female) were subjected to a forward and either internal or external rotary perturbation of the trunk and thigh on the weight-bearing-tibia while three dimensional kinematics were simultaneously collected. The protocol was repeated 24-48 h later to assess reliability.

FINDINGS

External perturbations resulted in significant internal rotation (IR) of the tibia on the femur (mean 7.3 (SD 3.9 degrees)) and IR of the femur on the pelvis (mean 6.8 (SD 5.4 degrees)) (P<0.05). Internal perturbations resulted in significant external rotation (ER) of the tibia on the femur (mean 6.8 (5.9 degrees)) and ER of the femur on the pelvis (mean 10.7 (SD 96.1 degrees)) (P<0.05). Additionally the external perturbation results in a significantly greater knee valgus (mean 3.6 (SD 2.2 degrees)) position while the internal perturbation results in a significantly greater knee varus position (mean 2.3 (SD 3.5 degrees)) (P<0.05). External perturbation hip and knee total joint displacements revealed moderate to strong reliability (Intraclass Correlation Coefficient(2,k)=0.67-0.94) while internal perturbations revealed slightly higher Intraclass Correlation Coefficients(2,k)(0.80-0.96).

INTERPRETATION

The lower extremity perturbation device provides a consistent external and internal perturbation of the femur on the weight-bearing-tibia. The observed transverse and frontal plane kinematics are similar to motions observed during cross-over and side-stepping tasks.

Authors+Show Affiliations

Schmitz RJ
Applied Neuromechanics Research Laboratory, Exercise and Sport Science, 250 HHP, University of North Carolina at Greensboro, Greensboro, NC 27402, USA. rjschmit@uncg.edu
Shultz SJ
No affiliation info available
Kulas AS
No affiliation info available
Windley TC
No affiliation info available
Perrin DH
No affiliation info available

MeSH

AdultAnkle JointBiomechanical PhenomenaFemaleHip JointHumansKnee JointLower ExtremityMaleMovementPhysical StimulationPostureRange of Motion, ArticularReflexWeight-Bearing

Pub Type(s)

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

Language

eng

PubMed ID

15531053

Citation

Schmitz, Randy J., et al. "Kinematic Analysis of Functional Lower Body Perturbations." Clinical Biomechanics (Bristol, Avon), vol. 19, no. 10, 2004, pp. 1032-9.
Schmitz RJ, Shultz SJ, Kulas AS, et al. Kinematic analysis of functional lower body perturbations. Clin Biomech (Bristol, Avon). 2004;19(10):1032-9.
Schmitz, R. J., Shultz, S. J., Kulas, A. S., Windley, T. C., & Perrin, D. H. (2004). Kinematic analysis of functional lower body perturbations. Clinical Biomechanics (Bristol, Avon), 19(10), 1032-9.
Schmitz RJ, et al. Kinematic Analysis of Functional Lower Body Perturbations. Clin Biomech (Bristol, Avon). 2004;19(10):1032-9. PubMed PMID: 15531053.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinematic analysis of functional lower body perturbations. AU - Schmitz,Randy J, AU - Shultz,Sandra J, AU - Kulas,Anthony S, AU - Windley,Thomas C, AU - Perrin,David H, PY - 2004/04/14/received PY - 2004/07/30/accepted PY - 2004/11/9/pubmed PY - 2005/1/5/medline PY - 2004/11/9/entrez SP - 1032 EP - 9 JF - Clinical biomechanics (Bristol, Avon) JO - Clin Biomech (Bristol, Avon) VL - 19 IS - 10 N2 - BACKGROUND: Sudden changes in direction on a single weight-bearing-limb are commonly associated with injury to the lower extremity. The purposes of this study were to assess the between day reliability of hip, knee, and ankle kinematic displacements achieved with internal and external femur-on-weight-bearing-tibia rotation perturbations and to determine the effect of these perturbations on three dimensional hip, knee and ankle kinematics. METHODS: Twenty recreationally active, healthy college students with no history of significant orthopedic injury (10 male, 10 female) were subjected to a forward and either internal or external rotary perturbation of the trunk and thigh on the weight-bearing-tibia while three dimensional kinematics were simultaneously collected. The protocol was repeated 24-48 h later to assess reliability. FINDINGS: External perturbations resulted in significant internal rotation (IR) of the tibia on the femur (mean 7.3 (SD 3.9 degrees)) and IR of the femur on the pelvis (mean 6.8 (SD 5.4 degrees)) (P<0.05). Internal perturbations resulted in significant external rotation (ER) of the tibia on the femur (mean 6.8 (5.9 degrees)) and ER of the femur on the pelvis (mean 10.7 (SD 96.1 degrees)) (P<0.05). Additionally the external perturbation results in a significantly greater knee valgus (mean 3.6 (SD 2.2 degrees)) position while the internal perturbation results in a significantly greater knee varus position (mean 2.3 (SD 3.5 degrees)) (P<0.05). External perturbation hip and knee total joint displacements revealed moderate to strong reliability (Intraclass Correlation Coefficient(2,k)=0.67-0.94) while internal perturbations revealed slightly higher Intraclass Correlation Coefficients(2,k)(0.80-0.96). INTERPRETATION: The lower extremity perturbation device provides a consistent external and internal perturbation of the femur on the weight-bearing-tibia. The observed transverse and frontal plane kinematics are similar to motions observed during cross-over and side-stepping tasks. SN - 0268-0033 UR - https://www.unboundmedicine.com/medline/citation/15531053/Kinematic_analysis_of_functional_lower_body_perturbations_ DB - PRIME DP - Unbound Medicine ER -