Table 2.
Patient-reported outcomes and physical performance-based tests compared between the direct anterior and direct lateral surgical approach for people one year after THA surgery. (n = 135).
| Outcome | Direct Anterior Procedure Mean (SD) | Direct Lateral Procedure Mean (SD) | p value | Effect Size SMD (95% CI) |
|---|---|---|---|---|
| Patient-Reported Outcomes | ||||
| Activities-specific Balance Confidence scale | 88.9 (13.9) | 83.8 (15.6) | .052 | 0.34 (−0.00, 0.68) |
| FROP-com | 7.2 (3.2) | 8.3 (3.6) | .055 | 0.32 (−0.02, 0.66) |
| Harris Hip Score | 95.4 (7.5) | 91.9 (11.2) | .05* | 0.36 (0.02, 0.70) |
| SF-12 Mental | 56.2 (5.8) | 54.7 (9.1) | .29 | 0.19 (−0.15, 0.53) |
| SF-12 Physical | 48.9 (9.5) | 44.9 (9.6) | .01* | 0.42 (0.07, 0.76) |
| WOMAC | 90.3 (11) | 81.9 (15.9) | .001* | 0.60 (0.25, 0.95) ** |
| Performance-Based Tests | ||||
| 30-s Chair Stand Test (repetitions) | 11.1 (3.7) | 10.7 (4) | .49 | 0.10 (−0.24, 0.44) |
| 6-m Walk Test (seconds) | 6.1 (1.4) | 6.8 (1.3) | .009* | 0.52 (0.17, 0.86)** |
| Step test (side with the least number of steps) | 11.7 (3.8) | 10.6 (3.4) | .09 | 0.31 (−0.04, 0.65) |
| Step test (non-surgical side) | 12.2 (3.8) | 11.2 (3.6) | .15 | 0.27 (−0.07, 0.61) |
| Step test (THA side) | 12.1 (3.8) | 11 (3.5) | .11 | 0.30 (−0.04, 0.64) |
| Timed Up and Go Test (seconds) | 10 (3.6) | 10.5 (2.5) | .38 | 0.16 (−0.18, 0.50) |
Note: SD, standard deviation; SMD, standardized mean difference; FROP-Com, Falls Risk for Older People in a Community Setting; WOMAC, Western Ontario McMaster Osteoarthritis Index; THA, total hip arthroplasty; Benchmark values of effects sizes were used to indicate the magnitude of the effects (small<0.5, moderate = 0.5–0.79, large>0.8)24; *, statistical significant difference; **, effect size is set as clinically important if the SMD>0.5; positive values for the SMD indicate the difference between the direct anterior and direct lateral procedures is in favor of the direct anterior.