Table 1.
Characteristics of patient population
| Variable | Open reduction | Arthroscopic reduction | Exact significance (2-sided) chi-square |
|---|---|---|---|
| Patients | 49 | 17 | |
| Hips | 59 | 19 | |
| Mean age at reduction, mths (range) | 9.47 (1 to 24) | 9.89 (3 to 21) | |
| Sex ratio (male:female) | 5:44 | 3:14 | |
| Side distribution (right:left) | 27:32 | 9:10 | |
| Side distribution (unilateral:bilateral) | 39:10 | 15:2 | |
| Preoperative characteristics | |||
| Mean AC angle (range) | 33.78° (23° to 45°) | 37.37° (30° to 55°) | |
| AC angle (normal:pathologic) | 21:33 | 3:16 | p = 0.090 |
| Ossific nucleus (present:absent) | 25:29 | 6:13 | p = 0.295 |
| Occurrence of ossific nucleus (normal:delayed) | 49:5 | 16:3 | p = 0.421 |
| Preoperative severity of dislocation, % (n/N) | |||
| Grade I | 0 (0/53) | 0 (0/19) | p = 0.363 |
| Grade II | 30.2 (16/53) | 15.8 (3/19) | |
| Grade III | 41.5 (22/53) | 52.6 (10/19) | |
| Grade IV | 28.3 (15/53) | 31.6 (6/19) |