| Popis: |
Objectives : The radiological measurement of the Böhler angle (BA) and the critical angle of Gissane (CAG) is used not only to diagnose and corroborate the suspicion of the presence of calcaneal fractures but also to assess the prognosis of different injury patterns and to evaluate the operative reduction of calcaneal fractures. Notwithstanding, many previous studies indicated the poor intra- and interobserver reproducibility of both angles. In this review article, we present the subtalar calcaneal angle (SCA) as an additional diagnostic tool - to BA and CAG - which can be applied on pre- and postoperative radiographs to assess calcaneal fractures involving the posterior facet. Design : Retrospective Study.Methods : Two retrospective groups were established, a ‘CF-group’ including radiographs of patients who were diagnosed with a calcaneal fracture and underwent operative treatment in the authors’ traumatology department, and a ‘control group’ with 50 lateral calcaneal radiographs clear of osseous lesions. Initially, the SCA, BA and the CAG were measured in both groups by three examiners. Those measurements were repeated one month later. Both the intra- and intertester reliabilities of all three angles were tested through the determination of the intraclass correlation coefficient (ICC). A paired t-test was used to prove the statistically significant difference between the SCA values for the pre- and postoperative groups, while the significant difference between the SCA values for the control and preoperative groups was tested through an independent-samples t-test. Results : The intra- and interobserver reliability of the SCA and the BA was in close proximity. The CAG showed poor intertester reliability. The values of the SCA in both the control and postoperative groups were significantly different compared to the measurements of the preoperative group.Conclusion : The subtalar calcaneal angle is a new instrument with proven reliability in estimating the prognosis of displaced calcaneal fractures and the postoperative alignment of the posterior facet. |
