I P Munugoda1, K Wills2, F Cicuttini3, S E Graves4, M Lorimer5, G Jones6, M L Callisaya7, D Aitken8. 1. Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia. Electronic address: Ishanka.Munugoda@utas.edu.au. 2. Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia. Electronic address: karen.wills@utas.edu.au. 3. Department of Epidemiology and Preventive Medicine, Monash University Medical School, Melbourne, Victoria, Australia. Electronic address: Flavia.Cicuttini@monash.edu. 4. Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR), Adelaide, South Australia, Australia. Electronic address: segraves@aoanjrr.org.au. 5. South Australian Health and Medical Research Institute (SAHMRI), Adelaide, South Australia, Australia. Electronic address: michelle.lorimer@sahmri.com. 6. Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia. Electronic address: graeme.jones@utas.edu.au. 7. Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia. Electronic address: michele.callisaya@utas.edu.au. 8. Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia. Electronic address: Dawn.Aitken@utas.edu.au.
Abstract
OBJECTIVE: To examine the association between ambulatory activity (AA), body composition measures and hip or knee joint replacement (JR) due to osteoarthritis. DESIGN: At baseline, 1082 community-dwelling older-adults aged 50-80 years were studied. AA was measured objectively using pedometer and body composition by dual-energy X-ray absorptiometry. The incidence of primary (first-time) JR was determined by data linkage to the Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR). Log binomial regression with generalized estimating equations were used to estimate the risk of JR associated with baseline AA and body composition measures, adjusting for age, sex, X-ray disease severity, and pain. RESULTS: Over 13 years of follow-up, 74 (6.8%) participants had a knee replacement (KR) and 50 (4.7%) a hip replacement (HR). AA was associated with a higher risk of KR (RR 1.09/1000 steps/day, 95% CI 1.01, 1.16) and a lower risk of HR (RR 0.90/1000 steps/day, 95% CI 0.81, 0.99). Body mass index (BMI) (RR 1.07/kg/m2, 95% CI 1.03, 1.12), total fat mass (RR 1.03/kg, 95% CI 1.01, 1.06), trunk fat mass (RR 1.05/kg, 95% CI 1.00, 1.09), and waist circumference (RR 1.02/cm, 95% CI 1.00, 1.04) were associated with a higher risk of KR. Body composition measures were not associated with HR. CONCLUSIONS: An objective measure of AA was associated with a small increased risk of KR and a small reduced risk of HR. Worse body composition profiles were associated with KR, but not HR. Altogether this may suggest different causal pathways for each site with regard to habitual activity and obesity.
OBJECTIVE: To examine the association between ambulatory activity (AA), body composition measures and hip or knee joint replacement (JR) due to osteoarthritis. DESIGN: At baseline, 1082 community-dwelling older-adults aged 50-80 years were studied. AA was measured objectively using pedometer and body composition by dual-energy X-ray absorptiometry. The incidence of primary (first-time) JR was determined by data linkage to the Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR). Log binomial regression with generalized estimating equations were used to estimate the risk of JR associated with baseline AA and body composition measures, adjusting for age, sex, X-ray disease severity, and pain. RESULTS: Over 13 years of follow-up, 74 (6.8%) participants had a knee replacement (KR) and 50 (4.7%) a hip replacement (HR). AA was associated with a higher risk of KR (RR 1.09/1000 steps/day, 95% CI 1.01, 1.16) and a lower risk of HR (RR 0.90/1000 steps/day, 95% CI 0.81, 0.99). Body mass index (BMI) (RR 1.07/kg/m2, 95% CI 1.03, 1.12), total fat mass (RR 1.03/kg, 95% CI 1.01, 1.06), trunk fat mass (RR 1.05/kg, 95% CI 1.00, 1.09), and waist circumference (RR 1.02/cm, 95% CI 1.00, 1.04) were associated with a higher risk of KR. Body composition measures were not associated with HR. CONCLUSIONS: An objective measure of AA was associated with a small increased risk of KR and a small reduced risk of HR. Worse body composition profiles were associated with KR, but not HR. Altogether this may suggest different causal pathways for each site with regard to habitual activity and obesity.
Authors: Hiral Master; Louise M Thoma; Tuhina Neogi; Dorothy D Dunlop; Michael LaValley; Meredith B Christiansen; Dana Voinier; Daniel K White Journal: Arch Phys Med Rehabil Date: 2021-06-24 Impact factor: 4.060