To evaluate the clinical effect of the locking plate plus Lost K-wire technique in the treatment of olecranon fractures with joint surface collapse.

The clinical data of 18 cases of ulna olecranon fracture with joint surface collapse in our hospital from June 2016 to January 2019 were retrospectively analyzed, including 12 males and 6 females; aged from 22 to 62 years, with an average of (35±8) years, 6 cases of sports injuries. 8 cases of traffic injury, 3 cases of injury and 1 case of falling injury. The patient was evaluated for efficacy based on the elbow joint activity range and the elbow joint Broberg&Morrey score criteria for the patient's last follow-up.

All the 18 patients were followed up for at least 6 months. All the patients healed in one stage. No complications such as wound infection, neurovascular injury, elbow stiffness and so on were found. No fracture reduction loss occurred in all patients. The fracture healing time was 12-24 weeks, with an average of 17±4 weeks. The range of flexion and extension of elbow joint was 90 °-150 °, the average was (118±22) °, and the range of rotation of forearm was 150 °-180 °, with an average of (160±11)°. The Broberg&Morrey score of elbow joint was 75-100 points, with an average of (93±6) points, excellent in 13 cases, good in 4 cases and fair in 1 case. The excellent and good rate was 94.44%.

Locking plate plus Lost K-wire technique can effectively reduce and maintain the smoothness and stability of the collapsed joint surface, which is beneficial to the early functional exercise of the patients. The postoperative curative effect is accurate, and it is a reliable choice for the treatment of this type of fracture.