Introduction and Objectives: In this retrospective study, we have evaluated the results of treatment of non-unions of the humeral diaphysis using plate osteosynthesis.

Materials and Methods: This is a retrospective study covering the years 1997–2002, with a total of 135 fractures of the humeral shaft: 84% were treated orthopaedically and 16% surgically by means of plate osteosynthesis. We present 14 cases of humeral non-union, all of which occurred after orthopaedic treatment, and 12 of which were surgically treated by means of plate osteosynthesis (the other 2 declined surgical treatment). The most common cause of fracture was accidental fall, and of the 12 cases, 11 were female, and 1 was male. Mean age was 67.6 years. Initial orthopaedic treatments included the following: in 9 cases U-splint + sling, in 1 case U-splint + Velpeau sling, in 2 cases hanging cast + Poulipen. Of these, the initial bandaging was replaced with braces after 2.5-3 months. Definitive surgical treatment was delayed an average of 8.1 months. We used the Müller-AO fracture classification system. There were 4 cases with 12B12, 3 cases with 12A12, 1 case with 12A11, 1 case with 12B22, 1 case with 12B11, 1 case with 12B21, and 1 case with 12A21. Surgical treatment was performed in 7 cases with LD-DCP plates, in 3 cases with DCP plates, in 1 case with a T-plate, and in 1 case with a straight plate. Corticocancellous bone grafts were transferred from the iliac crest in 9 of 12 cases.

Results: Bone healing was achieved in 11 of 12 surgical cases (one case without radiographic consolidation due to detachment of the plate due to trauma). In 2 cases there was a limitation of shoulder abduction at 85° and elbow extension -10°. In one case, there was repeat treatment due to failure of osteosynthesis. In two of the surgical cases, definitive BA will be measured upon completion of rehabilitation. Complications included 2 temporary radial palsies that recovered both motor and sensory function, one distal detachment of the plate due to previous trauma that had borderline BA and was non-painful. There was one case in which consolidation did not occur and where the humeral artery was injured iatrogenically during surgery (the same one that required repeat surgical intervention). There was one case of infection of the site of osteosynthesis due to Pseudomonas aeruginosa, which responded well to initial antibiotic treatment, and no material needed to be removed.

Discussion and Conclusions: Plate osteosynthesis is an effective treatment for non-unions of the humeral shaft and yields good joint mobility and few complications (similar to the results of other treatment methods) and must be performed by experienced surgeons.