The associations of phase angle with the structural severity and quadriceps strength among patients with hip osteoarthri
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ORIGINAL ARTICLE
The associations of phase angle with the structural severity and quadriceps strength among patients with hip osteoarthritis: the SPSS-OK study Osamu Wada 1 & Minoru Yamada 2 & Tsukasa Kamitani 3 & Kiyonori Mizuno 1 & Noriaki Kurita 4,5,6 Received: 23 July 2020 / Revised: 8 September 2020 / Accepted: 17 September 2020 # International League of Associations for Rheumatology (ILAR) 2020
Abstract Introduction/objectives This study examined whether phase angle (PhA) is associated with hip osteoarthritis (HOA) severity and quadriceps strength in patients with HOA. Method A series of 549 patients with HOA, obtained from the Screening for People Suffering Sarcopenia in the Orthopedic cohort of Kobe study, were analyzed. PhA and quadriceps strength were measured using bioelectrical impedance analysis and a handheld dynamometer, respectively. The HOA severity was graded using the Kellgren-Lawrence radiographic scale. We estimated (1) mean differences in PhA by differences in HOA severity and (2) mean differences in quadriceps strength by differences in PhA using general linear models. Results The patients’ mean age was 64.9 years, and 85% were women. A decreasing trend of PhA associated with increasing HOA severity was observed (P for trend < 0.001). PhA was statistically associated with a decrease in HOA grade 4 compared with that associated with HOA grade 1 (mean difference, − 0.40°; 95% confidence interval (CI), − 0.51° to − 0.30°). PhA per leg was associated with greater quadriceps strength per leg independent of age, sex, leg muscle mass, and HOA severity (mean difference per 1° increase, 3.80 Nm; 95% CI, 0.93 to 6.66). There was insufficient evidence of any difference in the association between PhA and quadriceps strength by HOA severity and sex (P for interaction = 0.07 and 0.06, respectively). Conclusions PhA gradually decreased with increasing HOA severity, especially in patients with end-stage HOA. Paying close attention to PhA might provide a key to increasing quadriceps strength, regardless of HOA severity.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10067-020-05419-3) contains supplementary material, which is available to authorized users. * Noriaki Kurita [email protected] 1
Anshin Hospital, Kobe, Japan
2
Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tokyo, Japan
3
Department of Healthcare Epidemiology, School of Public Health in the Graduate School of Medicine, Kyoto University, Kyoto, Japan
4
Department of Clinical Epidemiology, Graduate School of Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima City, Fukushima 960-1295, Japan
5
Department of Innovative Research and Education for Clinicians and Trainees (DiRECT), Fukushima Medical University Hospital, Fukushima, Japan
6
Center for Innovative Research for Communities and Clinical Excellence (CiRC2LE), Fukushima Medical University, Fukushima, Japan
Key Points • PhA gradually decreased with progression of HOA, particularly in patient
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