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  • Title: Patella fractures treated with cannulated lag screws and fiberwire® have a high union rate and low rate of implant removal.
    Author: Busel G, Barrick B, Auston D, Achor K, Watson D, Maxson B, Infante A, Sanders R, Mir HR.
    Journal: Injury; 2020 Feb; 51(2):473-477. PubMed ID: 31679830.
    Abstract:
    OBJECTIVES: The purpose of this study is to report the results of open reduction internal fixation of patella fractures (OTA 34 A-C) using cannulated lag screws and FiberWire® (Arthrex, Naples, FL, USA) with regard to union and symptomatic implant removal. DESIGN: Retrospective review of prospectively collected database. SETTING: Urban Level 1 trauma center and Level 2 trauma center METHODS: All displaced intra-articular patella fractures (OTA 34 A-C) treated with ORIF by cannulated lag screws and FiberWire® tension band/cerclage between January 1, 2009 and August 1, 2018. Three hundred and eighty seven consecutive patients were identified. Fifty fractures were included in the final analysis. MAIN OUTCOME MEASUREMENT: All patients were followed to clinical and radiographic union. Nonunion was defined as lack of clinical and radiographic union, fracture displacement, and/or return to OR for revision surgery. Rate of symptomatic implant removal was recorded. RESULTS: Average age was 57.7 years (range 21-86). Average follow up was 20.6 months (range 6-98 months). Average time to clinical and radiographic union was 3.1 months (range 3-7 months). Four fractures were open. There was a 96% (48/50) rate of primary union, with one patients requiring revision surgery to achieve union, and one developing an asymptomatic radiographic nonunion. The rate of symptomatic implant removal was 8% (4/50). Only 1 of the 4 was operated for a prominent suture knot, and the remaining 3 were for prominent screw removal. Knee range of motion averaged 0.37° extension to 119° flexion (range, 0-150°). CONCLUSION: Patella fractures can be treated with cannulated lag screws and FiberWire® with a high rate of primary union (96%) and a low rate of symptomatic implant removal (8%). The implant removal rate compares favorably with alternative constructs, with an equivalent rate of fracture union.
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