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a. Forest plot of the mean difference in acetabular cup anteversion error (in degrees) for PSI versus SI (control). Mean difference favored PSI (MD = −6.25, p = 0.04). There was considerable heterogeneity among studies (I2 = 98%; p < 0.00001). b. Forest plot of the mean difference in acetabular cup inclination error (in degrees) for PSI versus SI (control). Mean difference favored PSI (MD = −4.00, p = 0.0002). There was considerable heterogeneity among studies (I2 = 85%; p < 0.0001).
