[Minimally invasive treatment of calcaneal fractures by subtalar arthroscopy with posterior approach].

Objective: To evaluate the results of arthroscopically-assisted closed reduction and percutaneous screw fixation by posterior approach to subtalar joint for calcaneal fractures of Essex-Lopresti tongue type, Sanders IIA, IIB, and IIIAB. Methods: Sixteen patients with unilateral calcaneal fracture were treated with arthroscopically-assisted closed reduction and percutaneous screw fixation by posterior approach to subtalar joint between June 2012 and June 2015. There were 13 males and 3 females with an average age of 37.8 years (range, 18-65 years). The injury causes included falling from height in 10 cases and traffic accident in 6 cases. Of 16 cases, 4 were classified as Essex-Lopresti tongue type, 5 as Sanders IIA, 4 as Sanders IIB, and 3 as Sanders IIIAB. The interval of injury and operation was 4-8 days (mean, 5.94 days). The Böhler angle, Gissane angle, and width of calcaneus were measured before and after operation. American Orthopaedic Foot and Ankle Society (AOFAS) score was used to evaluate the ankle function at 12 months after operation. Results: Primary healing of incision was obtained in all cases, and no complications of infection, necrosis, and osseous fascia compartment syndrome occurred. The patients were followed up 12-15 months (mean, 13.63 months). The X-ray films showed that fracture line disappeared at 6 months after operation; the patients had no tenderness or percussion pain, no breakage or loosening of internal fixation, no varus calcaneus tuberosity, no subtalar joint fusion, and no compression symptoms of peroneal tendons. Achilles tendon irritation occurred in 2 cases, and disappeared after removal of internal fixation; traumatic arthritis occurred in 2 cases, and was relieved after removal of internal fixation. The Böhler angle, Gissane angle, and calcaneal width were significantly improved at 3 days and 6 months after operation when compared with preoperative ones ( Conclusion: It has the advantages of little trauma, less complication, and good function recovery to use arthroscopically-assited closed reduction and percutaneous screw fixation by posterior approach to subtalar joint for calcaneal fractures of Essex-Lopresti tongue type, Sanders IIA, Sanders IIB, and Sanders IIIAB.