Assessment of isokinetic trunk muscle strength and its association with health-related quality of life in patients with
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(2020) 21:827
RESEARCH ARTICLE
Open Access
Assessment of isokinetic trunk muscle strength and its association with healthrelated quality of life in patients with degenerative spinal deformity Sen Yang1,2†, Can Chen1†, Shiyu Du3†, Yong Tang1,4, Kai Li1, Xueke Yu1, Jiulin Tan1, Chengmin Zhang1, Zhigang Rong1, Jianzhong Xu1, Wenjie Wu1 and Fei Luo1*
Abstract Background: A considerable portion of the elderly population are increasingly afflicted by degenerative spinal deformity (DSD), which seriously affects patient health-related quality of life (HRQoL). HRQoL index is used across many studies to show correlations between radio-graphical alignment, disability, and pain in patients with DSD. However, imaged structural deformity represents only one aspect for consideration, namely, the disability effect of DSD. We assessed the isokinetic strength of trunk muscle in patients with degenerative spinal deformity (DSD), and investigated its relationship with HRQoL. Methods: In total, 38 patients with DSD (DSD group) and 32 healthy individuals (control group) were recruited. Both groups were homogeneous for age, weight, height and body mass index (BMI). Assessments were performed using the isokinetic dynamometer IsoMed-2000; trunk extensor, flexor strength and flexion/extension (F/E) ratios were explored concentrically at speeds of 30°, 60° and 120° per second. The grip strength of both hands was measured using a hand-held dynamometer. Visual analogue scale (VAS) scores, the Oswestry Disability Index (ODI), a Roland-Morris disability questionnaire (RDQ), and a 36-item Short Form Health Survey (SF-36) evaluated patient HRQoL. Correlations between trunk strength and HRQoL were analyzed. Results: When compared with the control group, the DSD group showed lower trunk extensor strength at three velocity movements, and higher F/E ratios at 60° and 120°/s (p < 0.05). Both groups exhibited similar trunk flexor strength and grip strength (p > 0.05). In DSD group, trunk extensor strength at 60°/s was negatively associated with ODI and RDQ (p < 0.05). A negative relationship between trunk flexor strength at 120°/s and ODI was also recorded (p < 0.05). In addition, trunk extensor strength at 60°/s and trunk flexor strength at 120°/s were positively correlated with physical functioning and role-physical scores according to the SF-36 (p < 0.05). (Continued on next page)
* Correspondence: [email protected] † Sen Yang, Can Chen and Shiyu Du are contributed equally to this work and should all be considered first authors. 1 Department of Orthopaedics, Southwest Hospital, Third Military Medical University (Army Medical University), 30 Gaotanyan Street, Shapingba, Chongqing 400038, China Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and
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