[Effectiveness of AO anatomical locking compression plate in treating type C distal humeral fracture].

OBJECTIVE: To evaluate the effectiveness of the AO anatomical locking compression plate in treating type C distal humeral fracture.

METHODS: Between July 2008 and April 2009, 13 cases of type C distal humeral fracture were treated with the AO anatomical locking compression plates. There were 5 males and 8 females with an average age of 52.1 years (range, 24-80 years). Fractures were caused by tumbling in 7 cases, by traffic accident in 4 cases, and by falling from height in 2 cases. According to Association for Osteosynthesis/Orthopaedic Trauma Association (AO/OTA) classification, there were 3 cases of type C1, 6 cases of type C2, and 4 cases of type C3. Two cases complicated by ulnar nerve injuries, 1 by radial nerve injury, 2 by fractures of ulnar olecranon, 3 by fractures of other parts of extremities, and 6 by osteoporosis. The time from injury to hospitalization ranged from 3 hours to 4 days (0.9 day on average).

RESULTS: All the incisions achieved healing by first intention. Thirteen cases were followed up 12 to 21 months with an average of 15.9 months. According to the X-ray films, unions were achieved both at fracture site and the olecranon osteotomy site with a healing time of 8 to 13 weeks (10 weeks on average). The function of elbows recovered from 3 to 32 weeks (10 weeks on average). No fixation failure, myositis ossificans, delayed union, or malunion occurred during the follow-up. The Mayo Elbow Performance score ranged from 75 to 100 with an average score of 95.8; the results were excellent in 9 cases, good in 3 cases, and fair in 1 case with an excellent and good rate of 92.3%.

CONCLUSION: The AO anatomical locking compression plate has a good fixation in treating type C distal humeral fracture. Through the approach of olecranon osteotomy, it is easy to get anatomical reduction, stable fixation, and early exercise.