Table 3.
Morphologic variables by case/control status, stratified by race (n=239)*
| Variable | White (n=176) | African American (n=63) | ||
|---|---|---|---|---|
| Cases (n=51) | Controls (n=125) | Cases (n=20) | Controls (n=43) | |
| MORPHOLOGY | ||||
| Acetabular depth (mm) | 36.70 (0.45) | 36.40 (0.38) | 37.00 (0.97) | 36.13 (0.74) |
| Acetabular width (mm) | 65.28 (0.79) | 64.59 (0.69) | 63.47 (1.05) | 62.70 (1.09) |
| Acetabular depth:width | 0.57 (0.01) | 0.56 (0.01) | 0.59 (0.02) | 0.57 (0.01) |
| AP alpha angle (°) | 65.36 (3.19) | 54.30 (1.73) | 64.79 (5.41) | 50.43 (1.85) |
| AP alpha angle >60° (categorical) | 48% (0.07) | 26% (0.04) | 55% (0.12) | 15% (0.06) |
| Minimum JSW (mm) | 3.22 (0.11) | 3.70 (0.09) | 3.20 (0.20) | 3.66 (0.11) |
| Extrusion index | 0.20 (0.01) | 0.19 (0.01) | 0.18 (0.02) | 0.17 (0.01) |
| Femoral shaft angle (°) | 131.85 (0.83) | 131.03 (0.67) | 131.46 (1.04) | 132.93 (0.92) |
| Gosvig ratio | 0.95 (0.01) | 0.94 (0.01) | 0.95 (0.02) | 0.94 (0.01) |
| Acetabular index (°) | 4.39 (1.32) | 2.29 (0.70) | 1.05 (2.34) | 0.68 (1.16) |
| LCEA (°) | 31.50 (1.29) | 31.61 (0.79) | 33.81 (2.48) | 33.58 (1.33) |
| LCEA <=25° | 24% (0.06) | 16% (0.04) | 10% (0.08) | 15% (0.06) |
| LCEA >40° | 20% (0.05) | 11% (0.03) | 23% (0.08) | 25% (0.07) |
| Proximal femoral angle (°) | 79.10 (1.14) | 81.07 (0.63) | 79.21 (1.43) | 80.98 (0.98) |
| Triangular index height (mm) | 22.89 (0.46) | 22.79 (0.37) | 22.17 (0.64) | 21.74 (0.59) |
| Crossover sign (categorical) | 41% (0.07) | 38% (0.05) | 9% (0.06) | 24% (0.07) |
| Deep acetabulum (categorical) | ||||
| Protrusio | 10% (0.05) | 2% (0.02) | 14% (0.11) | 11% (0.06) |
| Profunda | 61% (0.07) | 74% (0.04) | 71% (0.12) | 76% (0.08) |
| Triangular Index Sign (categorical) | 12% (0.04) | 4% (0.02) | 10% | 0% |
| DISTANCE | ||||
| Femoral head diameter (mm) | 57.16 (0.66) | 56.56 (0.56) | 55.51 (0.98) | 54.69 (0.94) |
| Femoral neck length (mm) | 58.25 (0.86) | 59.01 (0.79) | 56.84 (1.48) | 59.49 (1.08) |
| Minimum neck width (mm) | 38.31 (0.52) | 38.49 (0.48) | 38.45 (0.81) | 38.01 (0.83) |
| Interacetabular edge distance (mm) | 142.62 (1.22) | 142.62 (1.22) | 137.39 (2.23) | 137.39 (2.23) |
| Interhead center distance (mm) | 218.23 (1.60) | 218.23 (1.60) | 208.28 (3.09) | 208.28 (3.09) |
| Interteardrop distance (mm) | 141.43 (1.17) | 141.43 (1.17) | 136.36 (1.91) | 136.36 (1.91) |
| SI to symphysis (mm) | 98.64 (1.90) | 98.64 (1.90) | 100.00 (2.79) | 100.00 (2.79) |
| TILT | ||||
| Obturator foramen ratio | 1.04 (0.01) | 1.04 (0.01) | 1.02 (0.02) | 1.02 (0.02) |
| SC to symphysis (mm) | 38.87 (2.35) | 38.87 (2.35) | 46.98 (2.75) | 46.98 (2.75) |
*
Data are model-estimated means/percentages (standard errors) from GEE models unadjusted for covariates, accounting for correlation between hips in the same subject.
For femoral shaft angle, n=237; for Gosvig ratio, n=238; for deep acetabulum, n=234; for triangular index, n=238; for minimum neck width, n=238; for femoral neck length, n=238, for SC to symphysis, n=237.