[Modified staging strategy in treatment of type C3 Pilon fractures]

Objective: To investigate the safety, feasibility, and effectiveness of modified staging strategy in treatment of type C3 Pilon fractures.

Methods: The clinical data of 23 patients with type C3 Pilon fractures treated with modified staging strategy between January 2012 and January 2018 was retrospectively analyzed. There were 14 males and 9 females with an average age of 47.9 years (range, 22-61 years). Twenty-three cases were high-energy injuries, including 11 cases of traffic accidents and 12 cases of falling from height. One case was an open fracture of Gustilo type ⅢA with no obvious sign of infection on the wound after early treatment. The remaining patients were closed fractures. The time from injury to admission was 3-40 hours with an average of 16.4 hours. The preoperative pain visual analogue scale (VAS) score was 7.22±1.17 and American Orthopaedic Foot and Ankle Society (AOFAS) score was 0. The flexion and plantar flexion activities of ankle joint were (1.13±0.26) and (4.79±0.93)°, respectively. Twenty-two patients had a tibiofibular fracture. In the first-stage operation, the posterior approach was used to reduce the posterior column fracture and the external stent was temporarily assisted. After the soft tissue crisis was removed, the final fracture reduction and internal fixation was performed through the anterior approach in the second-stage operation.

Results: All 23 patients were followed up 12-84 months with an average of 26.6 months. The waiting time before the first-stage operation was 4-47 hours with an average of 23.4 hours. The interval between the two stage operations was 6-11 days with an average of 7.9 days. The first-stage operation time was 60-90 minutes with an average of 67.8 minutes; the second-stage operation time was 110-160 minutes with an average of 124.1 minutes. The hospital stay was 15-28 days with an average of 23.5 days. One patient (4.35%) had a tourniquet paralysis symptom after the second-stage operation, and two patients (8.7%) had delayed anterior incision healing. The other patients had incision healing without early complications. The radiographic review showed that the quality of articular surface reduction was excellent in 19 cases, good in 2 cases, and poor in 2 cases, with an excellent and good rate of 91.3%. At last follow-up, the fractures healed with no bone nonunion and malunion; the different degrees of osteoarthritis occurred in 7 cases. At last follow-up, the VAS score was 0.89 ±0.88 and the AOFAS score was 81.3±7.8. The flexion and plantar flexion activities of ankle joint were (10.23±5.05) and (20.97±3.92)°, respectively, and the differences between pre- and post-operation were significant ( P<0.05).

Conclusion: The midified staging strategy can not only provide a template for articular surface reduction for the second-stage anterior surgery, but also improve the quality of the reduction. It can also reduce the interval between the two operations and the operation time of the second-stage operation through the first-stage posterior fascial decompression, and can obtain satisfactory effectiveness.