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Retrospective Cohort Study
©The Author(s) 2026.
World J Orthop. Feb 18, 2026; 17(2): 112757
Published online Feb 18, 2026. doi: 10.5312/wjo.v17.i2.112757
Table 2 Results for each patient’s group, n (%)
Measurement period
2007 to June 15, 2019
After June 15, 2019
P value (two-tailed z test)
Total number of hemiarthroplasty cases1517937
Number of cemented stem cases1086 (71.58)692 (73.8)P = 0.2; z = -1.2 at a 95% confidence interval
Number of active smokers at the time of HA surgery62 (4.09)46 (4.9)P = 0.33; z = -0.96 at a 95% confidence interval
Number of early PJI cases in the first 12 weeks19 (1.25)14 (1.49)P = 0.6; z = -0.5 at a 95% confidence interval


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