Table 2.
Clinical results preoperative and at followup for the two study groups
| Clinical result | Protrusio group | Control group | p value* | p value† | p value‡ | p value§ | ||
|---|---|---|---|---|---|---|---|---|
| Preoperative | Followup | Preoperative | Followup | |||||
| Merle d’Aubigné-Postel score (18-0) [2] | 14.4 ± 1.9 (11–17) | 15.5 ± 2.0 (12–18) | 15.3 ± 1.2 (10–17) | 17.0 ± 1.0 (13–18) | 0.034 | 0.249 | < 0.001 | 0.001 |
| Pain (6-0) | 3.2 ± 1.1 (1–5) | 4.4 ± 1.4 (1–6) | 3.8 ± 0.7 (2–5) | 5.2 ± 0.8 (3–6) | 0.002 | 0.014 | < 0.001 | 0.013 |
| Mobility (6-0) | 5.4 ± 1.0 (2–6) | 5.6 ± 0.7 (4–6) | 5.8 ± 0.5 (4–6) | 5.9 ± 0.3 (5–6) | 0.115 | 0.178 | 0.421 | 0.064 |
| Walking ability (6-0) | 5.8 ± 0.4 (5–6) | 5.7 ± 0.5 (5–6) | 5.7 ± 0.6 (2–6) | 5.9 ± 0.3 (5–6) | 0.513 | 0.091 | 0.201 | 0.068 |
| WOMAC (0-100) [3] | - | 17 ± 17 (0–54) | - | 5 ± 9 (0–47) | - | - | - | < 0.001 |
| Pain (0-100) | - | 9 ± 9 (0–25) | - | 4 ± 9 (0–50) | 0.009 | |||
| Stiffness (0-100) | - | 6 ± 5 (0–18) | - | 7 ± 11 (0–45) | 0.214 | |||
| Function (0-100) | - | 27 ± 30 (0–96) | - | 4 ± 9 (0–47) | < 0.001 | |||
| Harris hip score (0–100) [11] | - | 80 ± 20 (37–100) | - | 94 ± 7 (72–100) | - | - | - | < 0.001 |
| SF-12 [9, 50] | - | - | - | - | - | |||
| Physical Component Scale (100-0) | - | 40 ± 10 (24–53) | - | 52 ± 7 (24–61) | < 0.001 | |||
| Mental Component Scale (100-0) | - | 58 ± 10 (21–67) | - | 52 ± 9 (33–63) | < 0.001 | |||
| UCLA score (10-0) [54] | - | 6 ± 2 (3–10) | - | 8 ± 2 (3–10) | - | - | - | < 0.001 |
| ROM (degrees) | ||||||||
| Flexion | 96 ± 13 (50–120) | 102 ± 9 (85–120) | 102 ± 11 (85–130) | 101 ± 10 (90–130) | 0.044 | 0.014 | 0.418 | 0.681 |
| Extension | 1 ± 2 (0–10) | 4 ± 3 (0–10) | 2 ± 4 (0–20) | 4 ± 3 (−10 to 10) | 0.349 | 0.005 | 0.013 | 0.843 |
| Internal rotation | 15 ± 12 (0–40) | 25 ± 15 (0–50) | 14 ± 10 (0–45) | 20 ± 11 (0–50) | 0.897 | 0.004 | < 0.001 | 0.139 |
| External rotation | 26 ± 12 (0–50) | 32 ± 12 (5–55) | 29 ± 11 (5–60) | 31 ± 14 (5–70) | 0.384 | 0.334 | 0.847 | 0.279 |
| Abduction | 30 ± 11 (5–45) | 35 ± 7 (25–45) | 32 ± 10 (0–60) | 44 ± 11 (5–70) | 0.983 | 0.484 | < 0.001 | < 0.001 |
| Adduction | 19 ± 7 (5–30) | 16 ± 5 (0–20) | 21 ± 8 (0–35) | 21 ± 6 (10–45) | 0.4 | 0.398 | 0.616 | < 0.001 |
| Anterior impingement test (percent positive) | 100 | 79 | 96 | 35 | 0.36 | 0.022 | < 0.001 | < 0.001 |
| Posterior impingement test (percent positive) | 41 | 16 | 21 | 0 | 0.054 | 0.067 | < 0.001 | 0.009 |
Ranges in parentheses; * preoperative between the two study groups; †pre- versus postoperative in the protrusio group; ‡pre- versus postoperative in the control group; §postoperative between the two study groups.