Table 2.
Comparison of severity of acetabular dysplasia, hip subluxation, and osteoarthritis based on plain radiographs and 3-D CT reconstruction models
| Variable | CMTHD group (n = 19 hips) |
DDH group (n = 45 hips) |
p value |
|---|---|---|---|
| Lateral center-edge angle (°)*,† | −14 (−50 to 11) | −2 (−24 to 21) | 0.001 |
| Anterior center-edge angle (°)*,† | −13 (−40 to 16) | 8 (−27 to 33) | < 0.001 |
| Tönnis angle (°)*,† | 31 (16–51) | 25 (10–49) | 0.025 |
| Acetabular volume (cm3)*,‡ | 27(18–35) | 31 (20–46) | 0.018 |
| Total femoral head area (cm2)*,‡ | 51 (28–78) | 46 (24–72) | 0.121 |
| Total acetabular area (cm2)*,‡ | 39 (19–58) | 35 (21–58) | 0.103 |
| Area of femoral head covered by acetabulum (cm2)*,‡ | 22 (12–31) | 26 (16–38) | 0.034 |
| Percentage of femoral head covered by the acetabulum (%)*,‡ | 45 (25–68) | 54 (35–79) | 0.007 |
| Tönnis grade (number of hips) | 0.006 | ||
| Arthritic (Grade 2 or 3) | 4 (22%) | 0 (0%) | |
| Nonarthritic (Grade 0 or 1) | 14 (78%) | 42 (100%) | |
* Values are expressed as mean, with range in parentheses; †measurement based on plain radiographs; ‡measurement based on 3-D CT reconstruction models; 3-D = three-dimensional; CMTHD = Charcot-Marie-Tooth hip dysplasia; DDH = developmental dysplasia of the hip.