Supplemental Table 2. Acetabular depth and width

Position (clock face) / Open-open / Open-closed / Closed-closed / p value
Parameter / Initial MRI / 1-year followup MRI / Initial MRI / 1-year followup MRI / Initial MRI / 1-year followup MRI
Acetabular depth
(mm) / 3/9 / 24 ± 2.6 (18-29) [24-25] / 25 ± 2.8 (19-32) [25-26]* / 26 ± 2.2 (20-29) [25-27]* / 26 ± 2.3 (21-30) [25-27]* / 25 ± 1.6 (22-29) [25-26]* / 26 ± 1.6 (23-29) [25-26]* / 0.003
2/8 / 25 ± 2.6 (16-32) [24-25] / 26 ± 2.7 (17-34) [25-26] / 26 ± 2.4 (22-31) [25-27] / 26 ± 2.3 (22-30) [25-27] / 25 ± 1.7 (22-30) [25-26] / 25 ± 1.7 (22-30) [25-26] / 0.087
1/7 / 25 ± 2.4 (19-31) [25-26]† / 27 ± 2.8 (20-33) [26-27]* / 27 ± 2.5 (21-32) [26-28]* / 27 ± 2.1 (24-32) [26-28]* / 26 ± 1.8 (23-30) [25-26] / 26 ± 1.6 (23-30) [25-27] / 0.016
12/6 / 25 ± 2.4 (18-30) [25-26]† / 26 ± 2.5 (21-32) [26-27]* / 27 ± 2.2 (24-32) [26-28]*,‡ / 27 ± 2.0 (24-31) [26-28]*,‡ / 26 ± 1.5 (23-29) [25-26] / 26 ± 1.5 (23-30) [25-26] † / 0.001
11/5 / 25 ± 2.1 (20-30) [25-26]† / 26 ± 2.3 (20-30) [25-27]*,‡ / 26 ± 2.3 (23-32) [25-27]*,‡ / 26 ± 2.4 (21-31) [25-27]*,‡ / 25 ± 1.7 (22-29) [24-26] / 25 ± 1.6 (22-29) [25-26] / 0.005
10/4 / 25 ± 2.4 (18-30) [24-26] / 26 ± 2.4 (19-31) [25-26] / 26 ± 2.2 (21-30) [25-27] / 26 ± 2.3 (22-31) [25-27] / 25 ± 1.5 (22-29) [25-26] / 26 ± 1.8 (22-30) [25-26] / 0.089
Acetabular width
(mm) / 3/9 / 47 ± 5.1 (34-57) [46-48] / 49 ± 5.2 (35-59) [48-50] / 50 ± 3.9 (44-60) [48-51] / 50 ± 4.0 (44-60) [49-52]* / 48 ± 3.4 (43-58) [47-49] / 49 ± 3.5 (44-59) [48-50] / 0.018
2/8 / 51 ± 4.7 (39-60) [50-52] / 53 ± 5.4 (38-65) [51-54]*,‡ / 53 ± 4.0 (44-61) [51-54] / 53 ± 4.0 (47-61) [51-55]*,‡ / 51 ± 2.6 (46-56) [50-51] / 51 ± 2.5 (46-56) [50-52] / 0.014
1/7 / 56 ± 5.7 (42-65) [55-57]† / 58 ± 6.0 (44-69) [56-59] / 59 ± 5.5 (53-70) [57-62]* / 60 ± 5.3 (54-74) [58-62]* / 57 ± 4.3 (50-66) [56-59] / 58 ± 4.5 (50-69) [56-60] / 0.012
12/6 / 51 ± 5.2 (35-62) [50-52] / 52 ± 5.4 (37-64) [51-54]† / 55 ± 4.0 (47-62) [53-56]* / 55 ± 3.6 (48-61) [53-56]* / 52 ± 3.7 (46-63) [51-54] / 53 ± 3.8 (47-65) [51-54]* / 0.001
11/5 / 48 ± 4.9 (35-59) [47-50]† / 50 ± 5.1 (37-61) [49-51] / 51 ± 4.0 (46-60) [50-53]* / 52 ± 4.0 (46-60) [50-53]*,‡ / 49 ± 3.7 (44-60) [48-50] / 49 ± 3.5 (45-61) [48-50] / 0.008
10/4 / 46 ± 5.1 (31-58) [45-47] † / 48 ± 5.4 (33-62) [47-50]* / 49 ± 4.9 (41-59) [47-51]* / 50 ± 4.8 (42-59) [48-52]*,‡ / 47 ± 3.5 (40-54) [46-48] / 48 ± 3.1 (41-55) [47-49]* / 0.014
Acetabular depth/width
ratio (%) / 3/9 / 52 ± 3.7 (43-61) [51-52] / 52 ± 3.6 (42-61) [51-53] / 52 ± 3.4 (43-59) [51-53] / 52 ± 3.3 (43-57) [51-53] / 53 ± 3.1 (46-61) [51-54] / 52 ± 3.2 (46-61) [51-54] / 0.689
2/8 / 49 ± 3.1 (42-57) [48-50] / 49 ± 2.7 (42-54) [48-50] / 50 ± 2.1 (45-55) [49-50] / 49 ± 2.6 (41-56) [48-50] / 50 ± 2.3 (46-55) [50-51] / 50 ± 2.1 (45-54) [49-51] / 0.069
1/7 / 45 ± 2.8 (40-52) [45-46] / 46 ± 3.2 (40-53) [45-47] / 45 ± 3.0 (38-51) [44-46] / 45 ± 2.6 (40-50) [44-46] / 45 ± 2.7 (40-49) [44-46] / 45 ± 2.7 (41-51) [44-46] / 0.387
12/6 / 50 ± 2.7 (43-57) [49-50] / 50 ± 6.7 (45-57) [48-51] / 49 ± 2.8 (44-55) [48-51] / 49 ± 2.7 (43-54) [48-50] / 49 ± 2.4 (43-52) [48-50] / 49 ± 2.4 (42-54) [48-50] / 0.086
11/5 / 52 ± 3.1 (43-64) [51-53] / 52 ± 2.7 (45-60) [51-52] / 51 ± 2.6 (47-57) [50-52] / 51 ± 2.7 (43-54) [50-52] / 51 ± 2.8 (45-56) [50-52] / 51 ± 2.6 (46-56) [50-52] / 0.494
10/4 / 54 ± 4.3 (47-65) [53-55] / 54 ± 4.5 (47-67) [53-55] / 53 ± 3.5 (45-61) [52-54] / 53 ± 2.6 (49-59) [52-54] / 54 ± 2.9 (49-61) [53-55] / 53 ± 3.1 (47-59) [52-54] / 0.863

Values are expressed as mean ± SD with range in parentheses; with 95% confidence interval in brackets; *p < 0.05 compared with initial MRI in the “open-open” group; †p < 0.05 compared with initial MRI in the “open-closed” group; ‡p < 0.05 compared with initial MRI in the “closed-closed” group.