Table, Supplemental Digital Content 3: Comparison of injury characteristics between patients who required conversion THA and those who did not after acetabular ORIF
Variable Total (n=685) Conversion
THA (n=108) No Conversion
(n=577) p-value
Fracture Classification (Letournel), n (%)
Anterior Column 20 (2.9) 0 (0) 20 (3.5)
<0.001
Posterior Column 4 (0.6) 0 (0) 4 (0.7)
Anterior Wall 0 (0) 0 (0) 0 (0)
Posterior Wall 207 (30.2) 25 (23.2) 182 (31.5)
Transverse 46 (6.7) 2 (1.9) 44 (7.6)
T-Shaped 52 (7.6) 12 (11.1) 40 (6.9)
Posterior Column +
Posterior Wall 68 (9.9) 10 (9.3) 58 (10.1) Anterior Column +
Posterior Hemitransverse
20 (2.9) 1 (0.9) 19 (3.3)
Both Column 72 (10.5) 5 (4.6) 67 (11.6)
Transverse + Posterior
Wall 196 (28.6) 53 (49.1) 143 (24.8) Fracture
Characteristics, n (%)
Protrusio 53 (7.7) 15 (13.9) 38 (6.6) 0.02
Dislocation 418 (61.0) 85 (78.7) 333 (57.7) <0.001 Marginal Impaction 183 (26.7) 36 (33.3) 147 (25.5) 0.10 Retained Intraarticular
Fragments 252 (36.8) 57 (52.8) 195 (33.8) <0.001 Comminution
(posterior wall) 290 (42.3) 68 (63.0) 222 (38.5) <0.001 Femoral Head Injury 119 (17.4) 32 (29.6) 87 (15.1) <0.001
Labral Tear 40 (5.8) 4 (3.7) 36 (6.2) 0.38
Mechanism of Injury, n (%)
MVC 501 (73.1) 86 (79.6) 415 (71.9)
0.73
FFH 55 (8.0) 6 (5.6) 49 (8.5)
MCC 53 (7.7) 7 (6.5) 46 (8.0)
FFS 28 (4.1) 6 (5.6) 22 (3.8)
PVA 19 (2.8) 0 (0) 19 (3.3)
Crush 16 (2.3) 3 (2.8) 13 (2.3)
Other 13 (1.9) 0 (0) 13 (2.3)
Injury Energy, high, n
(%) 655 (95.6) 102 (94.4) 553 (95.8) 0.45
Associated Injuries, n (%)
Abdominal 52 (7.6) 11 (10.2) 41 (7.1) 0.32
Bladder/GU 14 (2.0) 3 (2.8) 11 (1.9) 0.47
Pelvic ring fracture 129 (18.8) 22 (20.4) 107 (18.5) 0.69 Pelvic artery
embolization 18 (2.6) 4 (3.7) 14 (2.4) 0.51
Morel Lesion 9 (1.3) 2 (1.9) 7 (1.2) 0.64
Preoperative sciatic
nerve palsy, n (%) 60 (8.8) 11 (10.2) 49 (8.5) 0.58
Injury Severity Score,
mean (SD) 13.7 (8.1) 15.2 (8.5) 13.4 (8.0) 0.08
Time-to-surgery from admission, days, mean (SD)
3.0 (2.4) 3.7 (3.0) 2.9 (2.2) 0.01
Abbreviations defined: ORIF, open reduction and internal fixation; THA, total hip arthroplasty;
MVC, motor vehicle crash; FFH, fall from height; MCC, motorcycle crash; FFS, fall from standing height; PVA, pedestrian struck by automobile; GU, genitourinary; SD, standard deviation