US FDA defines non-union as fracture bone that has not completely healed in 9 months since injury and which has not shown any signs of healing over 3 consecutive months on serial x-rays. The operative treatment depends on the type of non-union. There are one-step or two-step procedures according to the principles of the ‘diamond concept’. This involves the improvement of the mechanical situation (in most cases with a re osteosynthesis) and vascularization, local application of osteoconductive carriers e.g. tricalcium phosphate, vial cells from autologous bone and osteoinductive substances like bone morphogenic proteins (BMP-2 or BMP-7).
Aim: To study the principles and method of fixation of non-union of distal femur with lock plates.
Material and Methods: It was a prospective study including patients with non-union of distal femur admitted and examined according to protocol after obtaining informed consent from the patient and permission from the institutional ethics committee. 40 cases satisfying the inclusion criteria admitted in tertiary healthcare centre of Navi Mumbai since May 2018 to March 2020 with minimum 1 year of follow up were included in the study.
Results: Patients were also evaluated as per non-union scores. The average non-union score was 19 (range 11 to 27). All of the non-unions united, at an average of 19 weeks. The average arc of knee motion improved from 85° preoperatively to 114° postoperatively. The average Neer’s score improved from an average of 60.4 points (range 16 to 44 points) preoperatively to 89 points post operatively. The knee society score (Part 1) improved from an average of 51.87 points (range 36 to 68) preoperatively to 81.725 points (range 74 to 93) post-operatively.
Conclusion: The operative technique respecting the biology and biomechanical principles has shown the influence of success of treating these fractures with locking plates.