TABLE, SUPPLEMENTAL DIGITAL CONTENT 1. Patient Characteristics Stratified by Tibial versus Femoral Fracture (N = 1030; tibia, n = 515; femur, n = 515)
Tibial IMN Femoral IMN P
Sex, male, n (%) 384 (74.5) 381 (74.0) 0.89
Age, y, mean (SD) 38.4 (17.3) 38.6 (17.2) 0.86
Race, n (%)
Caucasian 301 (58.5) 319 (61.9) 0.49
African American 173 (33.6) 161 (31.3)
Other 41 (8.0) 35 (6.8)
ISS, median (IQR) 13 (922) 13 (922) 0.31
AIS, n (%)
Brain 2, n (%) 96 (18.6) 79 (15.3) 0.18
Face 2, n (%) 57 (11.1) 51 (9.9) 0.61
Neck 2, n (%) 16 (3.1) 14 (2.7) 0.86
Thorax 2, n (%) 147 (28.5) 134 (26.0) 0.40
Abdomen 2 n (%) 69 (13.4) 73 (14.2) 0.79
Spine 2, n (%) 95 (18.5) 92 (17.9) 0.87
Upper extremity 2, n (%) 128 (24.9) 115 (22.3) 0.38
Lower extremity 4, n (%) 4 (1.2) 6 (0.8) 0.76
TRISS, median (IQR) 0.99 (0.96–0.99) 0.99 (0.97–0.99) 0.10
Systolic BP at admission, mean (SD) 142.5 (29.1) 141.7 (28.0) 0.65 Diastolic BP at admission, mean (SD) 83.1 (17.7) 82.3 (17.7) 0.50 Heart rate at admission, mean (SD) 92.4 (21.7) 92.8 (21.9) 0.66 Respiratory rate at admission, mean (SD) 20.2 (6.4) 20.2 (6.2) 0.93 Skeletal stabilization within 24 h, n (%) 461(89.5) 437 (84.9) 0.03
Staged fixation, n (%) 51 (9.9) 47 (9.1) 0.75
Definitive fixation within 24 h, n (%) 413 (80.2) 396 (76.9) 0.22 Time to definitive fixation, h, median (IQR) 13 (8–19) 14 (8–22) 0.14
Bilateral fracture, n (%) 45 (8.7) 39 (7.5) 0.57
Bilateral IMN, n (%) 36 (6.8) 36 (6.8) 1.00 IMN, intramedullary nail; SD, standard deviation; ISS, Injury Severity Score; IQR,
interquartile range; AIS, Abbreviated Injury Scale; TRISS, Trauma and Injury Severity Score;
BP, blood pressure.
