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The Capital Region of Denmark - a part of Copenhagen University Hospital

Previous surgery for instability is a risk factor for a worse patient-reported outcome after anatomical shoulder arthroplasty for osteoarthritis: a Danish nationwide cohort study of 3,743 arthroplasties

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BACKGROUND AND PURPOSE: Although most patients have good outcomes after shoulder arthroplasty for osteoarthritis, certain risk factors may lead to disappointing outcomes. We assessed risk factors for a worse outcome after anatomical shoulder arthroplasty for osteoarthritis. Our hypothesis was that previous surgery for instability would be a risk factor for a worse outcome independent of age, sex, and arthroplasty type.

PATIENTS AND METHODS: We included arthroplasties reported to the Danish Shoulder Arthroplasty Registry between 2006 and 2018 (n = 3,743). The Western Ontario Osteoarthritis of the Shoulder (WOOS) index at 1 year was used as outcome. The total score was converted to a percentage of a maximum score. The general linear model was used to analyze differences in WOOS. Age, sex, arthroplasty type, and previous surgery were included in the multivariate model. Estimates were given with 95% confidence intervals (CI).

RESULTS: The mean WOOS score was 78 for patients with no previous surgery and 55 for patients with surgery for instability. The mean difference was -16 (CI -10 to -22) in the multivariate model. Hemiarthroplasty had a worse outcome compared with total shoulder arthroplasty and young patients had a worse outcome compared with older patients. The mean differences in the multivariate model were -12 (CI -10 to -14) and -11 (CI -8 to -14) respectively.

INTERPRETATION: Patients with previous surgery for instability had worse results independent of age, sex, and arthroplasty type and should be informed about their individual risk of a worse outcome.

Original languageEnglish
JournalActa Orthopaedica
Pages (from-to)588-592
Number of pages5
Publication statusPublished - 21 Jun 2022

    Research areas

  • Arthroplasty, Replacement, Shoulder/adverse effects, Cohort Studies, Denmark/epidemiology, Hemiarthroplasty/adverse effects, Humans, Osteoarthritis/epidemiology, Patient Reported Outcome Measures, Reoperation, Risk Factors, Shoulder Joint/surgery, Treatment Outcome

ID: 79099939