[Outcome of corrective osteotomy of shortened medial foot column after old talar neck fracture].

OBJECTIVE

To investigate the effectiveness of corrective osteotomy for shortened medial foot column after old talar neck fracture.

METHODS

The clinical data of 10 patients with shortened medial foot column after old talar neck fracture between June 2012 and May 2017 was retrospectively analyzed. There were 7 males and 3 females with an average age of 45.8 years (mean, 21-67 years). The time from fracture to corrective osteotomy was 9-60 months (mean, 20.9 months). The preoperative visual analogue scale (VAS) score was 7.1±1.2, the American Orthopaedic Foot and Ankle Society (AOFAS) score was 48.5±12.3, and the short-form 36 health survey scale (SF-36) score was 46.7±10.5. All 10 cases received open wedge osteotomy of medial talus. Among them, 2 received subtalar fusion and Achilles tendon lengthening, 2 lateralizing calcaneal osteotomy, and 2 Achilles tendon lengthening.

RESULTS

All incisions healed by first intention. All patients were followed up 13-72 months (mean, 38.0 months). The X-ray film showed that the angle between longitudinal axis of 1st metatarsal bone and talus increased from (-9.6±4.5) ° before operation to (1.3±2.7) ° at last follow-up ( t=16.717, P=0.000); the angle between longitudinal axis of calcaneus and tibia increased from (-12.0±7.4) ° before operation to (-1.5±4.8) ° at last follow-up ( t=5.711, P=0.000). At last follow-up, the VAS score, AOFAS score, and SF-36 score were 1.6±1.0, 88.3±5.4, and 85.4±9.2, respectively, which increased significantly when compared with the preoperative scores ( t=13.703, P=0.000; t=14.883, P=0.000; t=16.919, P=0.000). X-ray film and CT showed that the osteotomy and arthrodesis sites healed well at 2-4 months after operation.

CONCLUSION

It's a proper procedure of anatomic reduction and reconstruction for patients with shortened medial foot column and good articular cartilage morphology after old talar fracture. Opening wedge osteotomy of medial talus is recommended and can obtain satisfactory clinical and radiographic results.