Biomechanical Evaluation of Patella Fractures Fixed with the Combination of Cerclage Wiring and a Tension Band (Pyrford technique)

Objective To investigate the probabilities of clinical application of Pyrford technique.Biomechanical testing was performed to evaluate biomechanical characteristics of patella fractures which fixed with the combination of cerclage wiring and a tension band(Pyrford technique). Methods Using ox cadaveric knee joints, transverse osteotomies of the patella were performed, and the simulated fractures fixed with the following techniques: the combination of cerclage wiring and a tension band(Pyrford technique), tension band with kirschner pins, and cerclage with wires alone. The effectiveness of fixation was measured and compared. Results Pyrford technique, same to tension band with kirschner pins, was fit for the biomechanical characteristics of patella. Pyrford technique could meet the need of strength, rigidity and physiological function of the knee joint. Conclusion The patella fractures fixed with the combination of cerclage wiring and a tension band(Pyrford technique) had advantages such as excellent biomechanical capabilities, anatomical reduction, simple operation, firm fixation, and suitable to function exercise in early stage.