Abstract: Objective To evaluate the effect of double-plate treatment on grade Ⅱ supination adduction ankle frac⁃tures with impaction of tibial plafond. Methods A total of 17 patients of gradeⅡ supination adduction ankle fractures with impaction of tibial plafond were treated surgically in our hospital. Anteromedial approach to the medial malleolus was taken to expose the tibial plafond and the vertical medial malleolus fractures. One distal radius plate was placed on the anteromei⁃ dal tibial plafond, and another buttress plate was placed on the medial malleolus. Bone grafting was used to restore the height of the collapsed tibia. Lateral malleolus fractures were treated with reconstruction plate. The fracture union after operation was detected by X-ray examination. American Orthopedic Foot and Ankle Society (AOFAS) ankle hind foot score was used to assess the ankle function. Results Sixteen of 17 patients were followed up postoperatively for a mean period of 2.6±0.9 years. CT cross-sectional study found that the collapsed articular surface of 12 (70.6%) patients was mainly located in the an⁃ teromedial one-fourth area, with the worst at anterior margin. Bony fusion was achieved in all patients after an average peri⁃ od of 2.9±0.5 months. No internal fixation loosening or fracture redisplacement was found by X-ray. The average range of an⁃ kle joint activity was 16.4°±2.8° for dorsiflexion, and was 39.2°±5.3° for plantarflexion. According to AOFAS ankle hindfoot scale, ankle function was excellent in 14 patients and good in 2, with excellence rate of 100%. Conclusion The application of double-plate fixation to treat grade Ⅱ supination adduction ankle fractures with impaction of tibial plafond can play a key role in reducing fracture redisplacement and osteoarthritis.

Key words: fractures, bone, fracture fixation, internal, ankle fracture, supination adduction