[Comparison of effectiveness between minimally invasive plating osteosynthesis and expandable intramedullary nailing technique in treatment of middle third humeral shaft fractures].

OBJECTIVE: To compare the effectiveness of two minimally invasive methods: minimally invasive plating osteosynthesis (MIPO) and expandable intramedullary nailing technique in treatment of middle third humeral shaft fractures.

METHODS: The clinical data were retrospectively analyzed and compared from 33 cases with middle third humeral shaft fractures between May 2004 and December 2008. All the patients were divided into 2 groups: 14 patients were treated with MIPO technique (group A) and 19 with expandable intramedullary nailing technique (group B). In group A, there were 10 males and 4 females with an average age of 35 years (range, 21-51 years). The disease cause was traffic accident in 5 cases, tumbling in 6 cases, machine related trauma in 2 cases, crushed by a heavy object in 1 case. Six fractures were classified as AO type A, 6 as type B, and 2 as type C. The time from injury to operation was 3 to 11 days with an average of 5.9 days. In group B, there were 12 males and 7 females with an average age of 40 years (range, 19-68 years). The disease cause was traffic accident in 7 cases, tumbling in 8 cases, falling from height in 3 cases, crush injury in 1 case. Ten fractures were classified as AO type A, 8 as type B, and 1 as type C. The time from injury to operation was 2 to 6 days with an average of 4.2 days. There was no significant difference in general data between 2 groups (P > 0.05).

RESULTS: The operation time was (104.6 +/- 25.8) minutes in group A and (85.0 +/- 35.7) minutes in group B, showing no significant difference (P > 0.05). Incision healed by first intention without iatrogenic radial nerve palsy in 2 groups. The patients were followed up 21.4 months on average (range, 12-37 months) in group A and 20.5 months on average (range, 22-35 months) in group B. The X-ray films showed bony healing in all patients. The fracture union time was (16.4 +/- 6.1) weeks in group A and (15.0 +/- 2.5) weeks in group B, showing no significant difference (P > 0.05). The University of California Los Angeles (UCLA) End-Result scores were 34.1 +/- 1.1 in group A and 31.8 +/- 2.6 in group B and the Mayo Elbow Performance scores were 100 in group A and 97.6 +/- 3.9 in group B; all showing significant differences (P < 0.05).

CONCLUSION: Good clinical outcomes could be obtained when middle third humeral shaft fractures are treated by either MIPO or expandable intramedullary nailing techniques. However, MIPO technique could offer better shoulder and elbow functional results.