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Zacharias A, Green RA, Semciw A, English DJ, Kapakoulakis T, Pizzari T. Atrophy of hip abductor muscles is related to clinical severity in a hip osteoarthritis population. Clin Anat 2018; 31:507-513. [PMID: 29446121 DOI: 10.1002/ca.23064] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/06/2018] [Accepted: 02/13/2018] [Indexed: 11/08/2022]
Abstract
Osteoarthritis mainly affects weight-bearing joints such as the hip and knee and is the most common form of arthritis. Greater muscle atrophy with fatty infiltration of gluteal muscles and decreased hip abduction strength has previously been identified with increasing severity of radiological hip OA. However, it is well documented that radiographic findings of OA do not always correlate with clinical severity. The aim of this secondary analysis was to examine whether atrophy and strength of gluteus maximus (GMax), medius (GMed), minimus (GMin), and tensor fascia lata (TFL) is associated with the clinical severity of OA. Twenty participants with unilateral hip OA and 20 age- and sex-matched asymptomatic controls were classified on the basis of clinical severity (mild, moderate-severe and asymptomatic groups) using the Oxford hip score. Muscle volumes of GMax, GMed, GMin, and TFL were determined using magnetic resonance imaging and expressed as asymmetry between limbs. A hand-held dynamometer was used to identify hip rotation and abduction strength. Regression analyzes were used to identify the association between muscle asymmetry and patient-reported severity of hip OA. Both symptomatic groups (mild and moderate-severe) demonstrated significant asymmetry in GMax (P < 0.01) and GMin (P < 0.01). GMed asymmetry was associated with only the moderate-severe symptomatic group. Hip abduction strength was reduced in both symptomatic groups. Gluteal muscle atrophy was associated with the clinical severity of OA. Clinical severity could be a useful tool for clinicians interpreting likely gluteal muscle changes and planning rehabilitation strategies for hip OA patients. Clin. Anat. 31:507-513, 2018. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Anita Zacharias
- Department of Pharmacy and Applied Science, College of Science, Health and Engineering, La Trobe University, Victoria.,Sport, Exercise and Rehabilitation Research Focus Area, La Trobe University, Victoria
| | - Rodney A Green
- Department of Pharmacy and Applied Science, College of Science, Health and Engineering, La Trobe University, Victoria.,Sport, Exercise and Rehabilitation Research Focus Area, La Trobe University, Victoria
| | - Adam Semciw
- La Trobe University Sports and Exercise Medicine Research Centre, Victoria.,School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Daniel J English
- Department of Pharmacy and Applied Science, College of Science, Health and Engineering, La Trobe University, Victoria.,Fusion Physiotherapy, Bendigo, Victoria, Australia
| | | | - Tania Pizzari
- Sport, Exercise and Rehabilitation Research Focus Area, La Trobe University, Victoria.,La Trobe University Sports and Exercise Medicine Research Centre, Victoria
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Chen JA, Dickerson CR, Wells RP, Laing AC. Older females in the workforce - the effects of age on psychophysical estimates of maximum acceptable lifting loads. ERGONOMICS 2017; 60:1708-1717. [PMID: 28554263 DOI: 10.1080/00140139.2017.1335883] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 05/22/2017] [Indexed: 06/07/2023]
Abstract
The number of older workers in the workforce is increasing substantially, and advanced age is associated with factors that could influence musculoskeletal injury risk and work capacity. This study's goals were to test whether psychophysical estimates of maximum acceptable weight of lift (liftmax) differed between younger and older workers, and to examine potential explanatory factors. Twenty-four female workers (half 50 + years; half 20-32 years) self-adjusted a box's mass to their perceived liftmax during four lifting tasks. Older workers' liftmax values were significantly lower (by approximately 24%) than their younger counterparts. There were no age-related differences in resting heart rate, or peak joint angles and final heart rate during the lifting trials. However, the older group demonstrated lower grip strength (by 24%), and lower heart rate reserve during the trials (by 18%). These results question whether current maximum acceptable lifting weights based on psychophysical information are appropriately protective for female workers greater than 50 years of age. Practitioner Summary: This psychophysical study demonstrated that older female workers (aged 50-63 years) selected maximum acceptable lift masses that were (on average) 24% lower than younger workers (aged 20-32 years), which corresponded with lower grip strength and heart rate reserve. Current maximum acceptable lifting weights based on psychophysical information may not protect female workers greater than 50 years of age.
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Affiliation(s)
- Jade A Chen
- a Faculty of Applied Health Sciences, Department of Kinesiology , University of Waterloo , Waterloo , Canada
| | - Clark R Dickerson
- a Faculty of Applied Health Sciences, Department of Kinesiology , University of Waterloo , Waterloo , Canada
| | - Richard P Wells
- a Faculty of Applied Health Sciences, Department of Kinesiology , University of Waterloo , Waterloo , Canada
| | - Andrew C Laing
- a Faculty of Applied Health Sciences, Department of Kinesiology , University of Waterloo , Waterloo , Canada
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