Abstract
Objective: High bone mass (HBM) is associated with an increased prevalence of radiographic knee OA (kOA), characterized by osteophytosis. We aimed to determine if progression of radiographic kOA, and its sub-phenotypes, is increased in HBM and whether observed changes are clinically relevant.
Design: A cohort with and without HBM (L1 and/or total hip bone mineral density Z-score>+3.2) had knee radiographs collected at baseline and 8-year follow-up. Sub-phenotypes were graded using the OARSI atlas. Medial/lateral tibial/femoral osteophyte and medial/lateral joint space narrowing (JSN) grades were summed and Δosteophytes, ΔJSN derived. Pain, function and stiffness were quantified using the WOMAC questionnaire. Associations between HBM status and sub-phenotype progression were determined using multivariable linear/poisson regression, adjusting for age, sex, height, baseline sub-phenotype grade, menopause, education and total body fat mass (TBFM). Generalized estimating equations accounted for individual-level clustering.
Results: 169 individuals had repeated radiographs, providing 330 knee images; 63% had HBM, 73% were female, mean(SD) age was 58(12) years. Whilst HBM was not clearly associated with overall Kellgren-Lawrence measured progression (RR=1.55[0.56,4.32]), HBM was positively associated with both Δosteophytes and ΔJSN individually (adjusted mean differences between individuals with and without HBM 0.45[0.01,0.89] and 0.15[0.01,0.29], respectively). HBM individuals had higher WOMAC knee pain scores (β=7.42[1.17,13.66]), largely explained by adjustment for osteophyte score (58% attenuated) rather than JSN (30% attenuated) or TBFM (16% attenuated). The same pattern was observed for symptomatic stiffness and functional limitation.
Conclusions: HBM is associated with osteophyte progression, which appears to contribute to increased reported pain, stiffness and functional loss.
Original language | English |
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Pages (from-to) | 1180-1190 |
Number of pages | 11 |
Journal | Osteoarthritis and Cartilage |
Volume | 28 |
Issue number | 9 |
Early online date | 14 May 2020 |
DOIs | |
Publication status | Published - Sept 2020 |
Bibliographical note
Acknowledgements:We would like to thank all our HBM study participants and the staff at the University of Bristol and our collaborating centres: Addenbrooke’s Wellcome Trust Clinical Research Facility, NIHR Bone Biomedical Research Unit in Sheffield, the Centre for Metabolic Bone Disease in Hull, Southmead Hospital in Bristol, Nuffield Orthopaedic Centre in Oxford, the Royal National Hospital for Rheumatic Diseases in Bath and St George’s Hospital in London.
Role of the funding source:
The HBM study was supported by The Wellcome Trust (080280/Z/06/Z), the National Institute for Health Research Clinical Research Network (portfolio no. 5163) and Versus Arthritis (ref 20000). AH is funded by the Wellcome Trust (grant ref 20378/Z/16/Z). Follow-up imaging at the Hull site was funded by OSPREY (OSteoPorosis Research in East Yorkshire). AH, LP, JHT and CLG work in, or are affiliated with, a University of Bristol and MRC funded unit (MC_UU_00011/1).
Keywords
- osteoarthritis
- progression
- high bone mass
- BMD
- WOMAC
- health-related quality of life
- Progression
- Health-related quality of life
- High bone mass
- Osteoarthritis
- STANDARDIZATION
- INCIDENT
- INCREASED PREVALENCE
- RISK
- HIP
- REPLACEMENT
- WOMEN
- MINERAL DENSITY
- ELDERLY-MEN
- ASSOCIATION