Table 3.
Radiographic data for Group I and Group II
| Parameter | Normal values [36] | Group I | Group II | ||
|---|---|---|---|---|---|
| Preoperative | Postoperative | Preoperative | Postoperative | ||
| Osteoarthritis score [40] (%)† | ‡ | ||||
| Grade 0 | 47 | 47 | 44 | 41 | |
| Grade 1 | 47 | 44 | 38 | 35 | |
| Grade 2 | 5 | 0 | 18 | 11§ | |
| Grade 3 | 2 | 9 | 0 | 13§ | |
| Total femoral coverage* (%) | 70–83 | 59 ± 9 (34–76) [57–62] | 81 ± 7 (68–100)§ [78–83] | 59 ± 15 (12–100) [56–62] | 84 ± 14 (10–100)§ [81–86] |
| Anterior coverage* (%) | 15–26 | 14 ± 7 (1–31) [12–16] | 16 ± 6 (4–33) [14–17] | 14 ± 7 (0–31) [12–15] | 16 ± 10 (0–47)§ [15–18] |
| Posterior coverage* (%) | 36–47 | 35 ± 8 (17–50) [32–36] | 38 ± 8 (3–48)§ [36–40] | 34 ± 12 (0–63) [31–36] | 40 ± 15 (1–82)§ [37–42] |
| Lateral center-edge angle* [46] (°) | 23–33 | 9 ± 8 (−17 to 24) [6–11] | 29 ± 6 (21–48)‡,§ [27–31] | 7 ± 9 (−20 to 30) [5–10] | 33 ± 12 (2–67)§ [31–36] |
| Acetabular index* [41] (°) | 3–13 | 22 ± 8 (3–50) [19–24] | 3 ± 5 (−9 to 20)§ [2–5] | 24 ± 10 (0–60) [21–25] | 2 ± 9 (−20 to 30)§ [1–4] |
| Extrusion index* [22] (%) | 17–27 | 40 ± 7 (26–63) [37–42] | 20 ± 7 (−5 to 32)‡,§ [18–22] | 40 ± 11 (7–81) [38–42] | 15 ± 11 (−13 to 39)§ [13–17] |
| Crossover sign [28] (% positive) | Negative | 36 | 15§ | 42 | 21§ |
| Shenton’s line intact (% intact) | Intact | 67 | 91‡,§ | 73 | 72 |
* Values of continuous parameters are expressed as mean ± SD with range in parentheses and confidence intervals in brackets; †osteoarthritis values were obtained at the most recent followup; hips with conversion to THA were included and graded as Tönnis Grade 3; ‡significant difference compared with Group II; §significant difference compared with preoperative status.