Campus Units

Kinesiology

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

6-2018

Journal or Book Title

Journal of Applied Biomechanics

Volume

34

Issue

3

First Page

191

Last Page

198

DOI

10.1123/jab.2017-0122

Abstract

A detailed understanding of the hip loading environment is needed to help prevent hip fractures, minimize hip pain, rehabilitate hip injuries, and design osteogenic exercises for the hip. The purpose of this study was to compare femoral neck stress during stair ascent and descent and to identify the contribution of muscles and reaction forces to the stress environment in mature adult subjects (n = 17; age: 50–65 y). Motion analysis and inverse dynamics were combined with musculoskeletal modeling and optimization, then used as input to an elliptical femoral neck cross-sectional model to estimate femoral neck stress. Peak stress values at the 2 peaks of the bimodal stress curves (stress vs time plot) were compared between stair ascent and descent. Stair ascent had greater compressive stress than descent during the first peak at the anterior (ascent: −18.0 [7.9] MPa, descent: −12.9 [5.4] MPa, P < .001) and posterior (ascent: −34.4 [10.9] MPa, descent: −27.8 [10.1] MPa, P < .001) aspects of the femoral neck cross section. Stair descent had greater tensile stress during both peaks at the superior aspect (ascent: 1.3 [7.0] MPa, descent: 24.8 [9.7] MPa, peak 1: P < .001; ascent: 15.7 [6.1] MPa, descent: 18.0 [8.4] MPa, peak 2: P = .03) and greater compressive stress during the second peak at the inferior aspect (ascent: −43.8 [9.7] MPa, descent: −51.1 [14.3] MPa, P = .004). Understanding this information can provide a more comprehensive view of bone loading at the femoral neck for older population.

Comments

This accepted article is published as Deng C, Gillette JC, & Derrick TR. (2018). Femoral neck stress in older adults during stair ascent and descent. Journal of Applied Biomechanics, 34(3);191-198. https://doi.org/10.1123/jab.2017-0122. Posted with permission.

Copyright Owner

Human Kinetics

Language

en

File Format

application/pdf

Published Version

Share

COinS