Skin movement errors in measurement of sagittal lumbar and hip angles in young and elderly subjects

Abstract Errors in measurement of sagittal lumbar and hip angles due to skin movement on the pelvis and/or lateral thigh were measured in young ( n = 21, age = 18.6 ± 2.1 years) and older ( n = 23, age = 70.9 ± 6.4 years) age groups. Skin reference markers were attached over specific landmarks of he...

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Bibliographic Details
Published in:Gait & posture 2008-02, Vol.27 (2), p.264-270
Main Authors: Kuo, Yi-Liang, Tully, Elizabeth A, Galea, Mary P
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Analysis of Variance
Chi-Square Distribution
Female
Hip
Hip Joint - physiology
Humans
Lumbar spine
Lumbar Vertebrae - physiology
Male
Measurement
Movement
Movement analysis
Orthopedics
Reproducibility of Results
Signal Processing, Computer-Assisted
Skin
Skin movement error
Software
Videotape Recording
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Summary:Abstract Errors in measurement of sagittal lumbar and hip angles due to skin movement on the pelvis and/or lateral thigh were measured in young ( n = 21, age = 18.6 ± 2.1 years) and older ( n = 23, age = 70.9 ± 6.4 years) age groups. Skin reference markers were attached over specific landmarks of healthy young and elderly subjects, who were videotaped in three static positions of hip flexion using the 2D PEAK Motus video analysis system. Sagittal lumbar and hip angles were calculated from skin reference markers and manually palpated landmarks. The elderly subjects demonstrated greater errors in lumbar angle due to skin movement on the pelvis only in the maximal hip flexion position. The traditional model (ASIS-PSIS-GT-LFE) underestimated sagittal hip angle and the revised model (ASIS-PSIS-2/3Th-1/4Th) provided more accurate measurement of sagittal hip angle throughout the full available range of hip flexion. Skin movement on the pelvis had a small counterbalancing effect on the larger errors from lateral thigh markers (GT-LFE), thereby decreasing hip angle error.
ISSN:0966-6362
1879-2219
DOI:10.1016/j.gaitpost.2007.03.016