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Table 1 Differences in elective arthroplasty services from February to April

From: Lessons learnt from the impact of COVID-19 on arthroplasty services in Hong Kong: how to prepare for the next pandemic?

  COVID-19 Cohort (2020) Control Cohort (2019) Change P Value
Monthly Mean ± SD Monthly Mean ± SD
Operations
 Total 46.3 ± 16.9 327 ± 45.3 -85.8% 0.004
 Revision joint replacement
  Revision hip arthroplasty 10 ± 4.6 7 ± 2 42.9% 0.382
  Revision knee arthroplasty 8.3 ± 4.2 4.7 ± 2.5 78.6% 0.276
 Primary joint replacement
  Total hip arthroplasty 6.7 ± 2.1 45 ± 6.6 -85.2% 0.006
  Total knee arthroplasty 21.3 ± 21.0 270.3 ± 43.5 -92.1% 0.003
Hospital admissions 40 ± 19.7 325 ± 44.3 -87.7% 0.003
Orthopaedic clinic attendances 1652.3 ± 143.5 2336.3 ± 200.1 -29.3% 0.011