Overall fracture characteristics and surgical factors
| Ballistic femoral neck fractures | Closed blunt-injury femoral neck fractures | P Value | |
| N=14 | N=29 | ||
| Time from injury to operation (days) | 1 (0 to 1) | 1 (0 to 1) | 0.363 |
| Displaced fracture | 11 (79%) | 29 (100%) | 0.010 |
| AO classification | |||
| Subcapital* (31B1) | 5 (36%) | 5 (17%) | |
| Transcervical* (31B2) | 5 (36%) | 17 (59%) | |
| Basicervical* (31B3) | 1 (7%) | 5 (17%) | 0.009 |
| Unreported | 3 (21%) | 2 (7%) | |
| Implants | |||
| Cannulated screw | 4 (29%) | 8 (28%) | |
| Dynamic hip screw | 5 (36%) | 14 (48%) | |
| Modern fixed angle construct† | 1 (7%) | 6 (21%) | |
| Blade plate | 3 (21%) | 1 (3%) | 0.190 |
| Unreported | 1 (7%) | 0 (0%) | |
| Surgical approach for reduction | |||
| Direct anterior (Smith-Peterson) | 8 (57%) | 23 (79%) | |
| Anterolateral (Watson-Jones) | 2 (14%) | 6 (21%) | |
| Closed reduction | 4 (29%) | 0 (0%) | 0.010 |
| Fracture reduction quality‡ | |||
| 1—Excellent | 7 (50%) | 22 (76%) | |
| 2—Good | 2 (14%) | 3 (10%) | |
| 3—Fair | 1 (7%) | 2 (7%) | |
| 4—Poor | 0 (0%) | 0 (%) | 0.737 |
| Unreported | 4 (29%) | 2 (%) | |
Values are represented as median (IQR) or as the number of patients (percentage of the group). P values are from the Wilcoxon rank-sum test or χ2 test.
*Per the AO/OTA (2018) fracture compendium.14
†Either the Femoral Neck System (DePuy Synthes, West Chester, PA) or Conquest FN (Smith & Nephew, Warford, England, UK).
‡Fracture reduction was graded as excellent (<2 mm of displacement and <5 degrees of angulation in any plane), good (2 to 5 mm displaced and/or 5 to 10 degrees of angulation), fair (>5 to 10 mm displaced and/or >10 to 20 degrees of angulation), and poor (>10 mm displaced and/or >20 degrees of angulation) per Haidukewych et al.11