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Phys. Ther. Korea 2022; 29(4): 249-254

Published online November 20, 2022

https://doi.org/10.12674/ptk.2022.29.4.249

© Korean Research Society of Physical Therapy

The Relationship Between Hip Abductor and Pelvic Drop During Lateral Step Down in the Elderly

Young-kwon Lee1,3 , PT, BPT, Sung-hoon Jung2,3 , PT, PhD, Hwa-ik Yoo1,3 , PT, BPT, Oh-yun Kwon2,3 , PT, PhD

1Department of Physical Therapy, The Graduate School, Yonsei University, 2Department of Physical Therapy, College of Software and Digital Healthcare Convergence, Yonsei University, 3Kinetic Ergocise Based on Movement Analysis Laboratory, Wonju, Korea

Correspondence to: Oh-yun Kwon
E-mail: kwonoy@yonsei.ac.kr
https://orcid.org/0000-0002-9699-768X

Received: July 22, 2022; Revised: August 25, 2022; Accepted: August 26, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background: The lateral step down (LSD) is a form of stair negotiation used by the elderly because it requires less movement of the lower extremity. Although it is necessary to study the amount of pelvic drop and the strength of a hip abductor during LSD for intervention, limited studies have investigated the relationship between the amount of pelvic drop and strength of a hip abductor during LSD in elderly people. Objects: This study aimed to determine the relationship between the amount of pelvic drop on an unsupported leg and the strength of the hip abductor during LSD in the elderly.
Methods: Thirty elderly people (male: 17, female: 13) were recruited. Subjects performed the LSD task, and the evaluator measured and the amount of pelvic drop on an unsupported side. Also, the isometric strength of the hip abductor was measured in a supine position.
Results: We found significant relationships between the strength of the hip abductor and the amount of pelvic drop (r = –0.386). The average hip abductor strength normalized by body weight was 1.06 N/kg (max: 1.99, min: 0.52) and the average contralateral pelvic drop (CPD) angle was 4.16° (max: 15.3, min: 0).
Conclusion: Our results indicated that the strength of the hip abductor had a moderate correlation with the CPD during a LSD in the elderly. Hip abductor weakness could translate into altered movement of the pelvis.

Keywords: Hip abductor, Pelvic drop, Senile weakness, Step down

Article

Original Article

Phys. Ther. Korea 2022; 29(4): 249-254

Published online November 20, 2022 https://doi.org/10.12674/ptk.2022.29.4.249

Copyright © Korean Research Society of Physical Therapy.

The Relationship Between Hip Abductor and Pelvic Drop During Lateral Step Down in the Elderly

Young-kwon Lee1,3 , PT, BPT, Sung-hoon Jung2,3 , PT, PhD, Hwa-ik Yoo1,3 , PT, BPT, Oh-yun Kwon2,3 , PT, PhD

1Department of Physical Therapy, The Graduate School, Yonsei University, 2Department of Physical Therapy, College of Software and Digital Healthcare Convergence, Yonsei University, 3Kinetic Ergocise Based on Movement Analysis Laboratory, Wonju, Korea

Correspondence to:Oh-yun Kwon
E-mail: kwonoy@yonsei.ac.kr
https://orcid.org/0000-0002-9699-768X

Received: July 22, 2022; Revised: August 25, 2022; Accepted: August 26, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background: The lateral step down (LSD) is a form of stair negotiation used by the elderly because it requires less movement of the lower extremity. Although it is necessary to study the amount of pelvic drop and the strength of a hip abductor during LSD for intervention, limited studies have investigated the relationship between the amount of pelvic drop and strength of a hip abductor during LSD in elderly people. Objects: This study aimed to determine the relationship between the amount of pelvic drop on an unsupported leg and the strength of the hip abductor during LSD in the elderly.
Methods: Thirty elderly people (male: 17, female: 13) were recruited. Subjects performed the LSD task, and the evaluator measured and the amount of pelvic drop on an unsupported side. Also, the isometric strength of the hip abductor was measured in a supine position.
Results: We found significant relationships between the strength of the hip abductor and the amount of pelvic drop (r = –0.386). The average hip abductor strength normalized by body weight was 1.06 N/kg (max: 1.99, min: 0.52) and the average contralateral pelvic drop (CPD) angle was 4.16° (max: 15.3, min: 0).
Conclusion: Our results indicated that the strength of the hip abductor had a moderate correlation with the CPD during a LSD in the elderly. Hip abductor weakness could translate into altered movement of the pelvis.

Keywords: Hip abductor, Pelvic drop, Senile weakness, Step down

Fig 1.

Figure 1.Measurement of hip abduction muscle strength.
Physical Therapy Korea 2022; 29: 249-254https://doi.org/10.12674/ptk.2022.29.4.249

Fig 2.

Figure 2.Measurement of pelvic drop during lateral step down. Rt., right; Lt., left; ASIS, anterior superior iliac spines.
Physical Therapy Korea 2022; 29: 249-254https://doi.org/10.12674/ptk.2022.29.4.249

Fig 3.

Figure 3.Scatterplot between contralateral pelvic drop and hip abductor strength.
Physical Therapy Korea 2022; 29: 249-254https://doi.org/10.12674/ptk.2022.29.4.249

Table 1 . General characteristics (N = 30).

VariableMean ± SDMinimumMaximum
Age (y)66.9 ± 6.026079
Height (cm)158 ± 8.73145178
Weight (kg)60.23 ± 11.094690
Body mass index (kg/m2)23.81 ± 3.0119.4733.30
Hip abductor strength (N/kg)1.06 ± 0.390.521.99
Contralateral pelvic drop (°)4.16 ± 2.93015.3

Values are presented as mean ± standard deviation or number only..