Purpose: To report the outcome after minimally invasive plate osteosynthesis (MIPO) through the deltoid-splitting approach for proximal humeral fractures.
Methods: 10 men and 30 women aged 37 to 88 years underwent MIPO through the deltoid-splitting approach using the Proximal Humerus Internal Locking System or the Locking Proximal Humerus Plate for 2-part (n=18), 3-part (n=20), and 4-part (n=2) proximal humeral fractures. The rehabilitation protocol was standardised.
Results: All 40 patients were followed up at 3 months, 34 (85%) at 6 months, 30 (75%) at one year, and 13 (33%) at 2 years. Two patients had malunion. No patient had avascular necrosis, infection, nerve palsy, or nonunion. The mean Constant score at one year and 2 years was 75 and 87.5, respectively. The Constant score at 6 months correlated to that at one year (r=0.926, p<0.0001) and at 2 years (r=0.874, p=0.0001). In younger patients, improvement in the range of motion was faster. The early plateau group (those with no further improvement after 6 months) and the late plateau group (those with no further improvement after one year) did not differ significantly in age, fracture grade, or hand dominance.
Conclusion: MIPO for fixation of proximal humeral fractures using a locking plate is safe and effective in enabling an early return of shoulder function.
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