Introduction Lateral malleolus fracture is one of the most common fractures. However, there is controversy regarding the rehabilitation protocols used after surgery. In particular, the initiation point for weight bearing has not been standardized. In the present study, we investigated the prognostic difference between immediate and delayed weight bearing on lateral malleolus fractures. Materials and Methods The medical records of matched 50 and 41 patients in the immediate and delayed weight-bearing groups were reviewed retrospectively. All patients were treated with open reduction and internal fixation using an anatomical locking compression plate. In the immediate weight-bearing group (IWB), tolerable weight bearing (i.e., can be endured immediately after surgery with crutches) was permitted. In the delayed weight-bearing group (DWB), weight bearing was completely restricted for 4 weeks after surgery. Ankle motion exercise was permitted in both groups starting from the day after surgery. Radiographic assessment data and clinical outcomes were reviewed. Results No significant differences in the radiographic assessments and complications were found between the two groups. Significant differences in shortened length of hospital stay and time to return to work with the IWB rehabilitation protocol were confirmed (IWB group vs. DWB group: 5.7 vs. 8.0 days and 6.0 vs. 8.0 months, respectively). A significant difference in sport factor was observed in the Foot and Ankle Outcome Score at 3 months postoperatively (75.5 vs 68.5). Conclusions We found no significant differences between the two groups with respect to postoperative radiological outcome and complications. The benefits of shortening the time to return to work and length of hospital stay associated with the IWB rehabilitation protocol were confirmed. In conclusion, immediate weight bearing is recommended in patients with lateral malleolus fracture after anatomical reduction and firm fixation by surgery.
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