Sample size calculations comparing total hip arthroplasty (THA) and hemiarthroplasty (HA)
| Study | THA reoperation rate | HA reoperation rate |
|---|---|---|
| van den Bekerom et al31 | 5/110 (4.5%) | 1/136 (0.7%) |
| Baker et al32 | 4/36 (11.1%) | 2/39 (5.1%) |
| Blomfeldt et al33 | 4/56 (7.1%) | 3/57 (5.3%) |
| Keating et al34 | 6/63 (9.5%) | 5/64 (7.8%) |
| Macaulay et al35 | 1/16 (6.25) | 0/23 (0%) |
Studies included in a meta-analysis comparing THA with HA for the outcome of reoperation at 1 year.
THA versus HA combined effect: fixed and random, relative risk=1.67 (95% CI 0.86 to 3.24), p=0.13.
Pooled event rates: THA fixed and random, incidence rate=7.8% (95% CI 5.2 to 11.6).
HA fixed, incidence rate=5.3% (95% CI 3.2 to 8.9).
HA random, incidence rate=4.9% (95% CI 2.6 to 9.2).