We identified 106 surgically managed talus fractures. Five (4.7%) were lateral process and talar head fractures (AO/OTA 81-A). Seventy-six (71.7%) were talar neck fractures (81-B), which included 13 (12%) 81-B1 fractures, 31 (29%) 81-B2 fractures, and 32 (30%) 81-B3 fractures. Twenty-five (23.6%) were talar body fractures (81-C). AO/OTA 81-B3 fractures were identified and separately analyzed and compared with talus fractures of all other classes. AO/OTA 81-B talar neck fractures were classified with the Hawkins system7 as well: 13 (12%) were Hawkins 1 fractures, 31 (29%) Hawkins 2 fractures, 25 (24%) Hawkins 3 fractures, and 7 (7%) Hawkins 4 fractures.
Subject Analysis (Table 2)
Table 2.
Of the 106 patients, 69 were female and 37 male. Mean age was 37.7 years (range, 18-78 years). Mean body mass index (BMI) was 29.45 kg/m2. Of the 106 cases, 52 were managed by board- certified orthopedic trauma surgeons, 32 by board- certified foot and ankle surgeons, and 22 by orthopedic surgeons with other specialty training.
The mechanisms of injury were motor vehicle accident (70/106; 66%), fall from height (25; 24%), misstep (4), sports related (2), object falling on ankle (2), and not reported (3).
Of the 106 patients, 45 (42%) had isolated talus injuries, 35 had concomitant ipsilateral lower extremity injuries, 25 had concomitant contralateral lower extremity injuries, and 1 had a concomitant upper extremity injury.
Smoking status was everyday (14 patients), past (10), never (34), and unreported (48). Five patients reported a history of alcohol abuse, and 4 patients reported illicit drug use. Two had a history of atrial fibrillation, 9 had hypertension, 3 had hyperlipidemia, 3 had renal disease, 3 had heart disease, 4 had diabetes, 3 had lung disease, and 1 had a history of lung cancer.
Overall Analysis of AVN/PTOA (Table 3)
Table 3.
Of the 106 patients, 43 (41%) developed AVN/PTOA, and 63 (59%) did not, while fifty-four (51%) of the 106 patients who developed AVN/PTOA had polytrauma, and 52 (49%) of those who did not develop AVN/PTOA had polytrauma (P = .79). There was no significant difference in mean age (38.74 years for AVN/PTOA, 36.21 years for no AVN/PTOA; P = .20) or BMI (28.99 kg/m2 for AVN/PTOA, 29.15 kg/m2 for no AVN/PTOA; P = .45). Direct comparison of proportions of polytrauma to development of AVN/PTOA revealed no significant difference. Direct comparison of the proportions of open injuries to development of AVN/PTOA revealed a significant difference. Fifteen (35%) of the 43 patients who developed AVN/PTOA had open injuries, and 10 (16%) of the 63 who did not develop AVN/PTOA had open injuries (P = .03). There was no significant difference in follow-up between patients who developed AVN/PTOA and those who did not (P = .26).
Analysis of AVN/PTOA in 81-B3 Fracture-Dislocations (Table 4)
Table 4.
Of the 32 patients with AO/OTA 81-B3 (Hawkins 3 or 4) fractures, 16 (50%) developed AVN/PTOA, and 16 did not. There was no significant difference in mean age (41.05 years for AVN/PTOA, 37.40 years for no AVN/PTOA; P = .29), BMI (28.86 kg/m2 for AVN/PTOA, 27.94 kg/m2 for no AVN/PTOA; P = .38), or surgical timing (19.09 hours for AVN/PTOA, 16.65 hours for no AVN/PTOA; P = .29) for development of AVN/PTOA. Direct comparison of the proportions of polytrauma and open injuries to development of AVN/PTOA in patients with 81-B3 fracture- dislocations revealed no significant difference. Nine of the 16 patients (56%) who developed AVN/PTOA had polytrauma, and 11 of the 16 (69%) who did not develop AVN/PTOA had polytrauma (P = .465). Although open injury was found to predict AVN/PTOA overall, this was not true for talus fracture-dislocations alone. Five of the 10 patients who developed AVN/PTOA had open injuries, and 5 of the 10 who did not develop AVN/PTOA had open injuries (P = 1.0). There was a significant difference in follow-up time between these groups. Patients who had 81-B3 fracture-dislocations and developed AVN/PTOA were followed for a mean of 120.4 weeks, and those who did not develop AVN/PTOA were followed for a mean of 40.33 weeks (P = .001).