Abstract
Introduction
Treatment of both simple and complex patella fractures is a challenging clinical problem. Although tension band wiring has been the standard of care, it can be associated with high complication rates. The aim of this study was to investigate the biomechanical performance of recently developed lateral rim variable angle locking plates versus tension band wiring used for fixation of simple and complex patella fractures.
Materials and methods
Sixteen pairs of human anatomical knees were used to simulate either two-part transverse simple AO/OTA 34-C1 or five-part complex AO/OTA 34-C3 patella fractures by means of osteotomies, with each fracture model created in eight pairs. The complex fracture pattern was characterized by a medial and a lateral proximal fragment, together with an inferomedial, an inferolateral, and an inferior (central distal) fragment mimicking comminution around the distal patellar pole. The specimens with simple fractures were pairwise assigned for fixation with either tension band wiring through two parallel cannulated screws or a lateral rim variable angle locking plate. The knees with complex fractures were pairwise treated with either tension band wiring through two parallel cannulated screws plus circumferential cerclage wiring or a lateral rim variable angle locking plate.
Each specimen was tested over 5000 cycles by pulling on the quadriceps tendon, simulating active knee extension and passive knee flexion within the range of 90° flexion to full extension. Interfragmentary movements were captured via motion tracking.
Results
For both fracture types, the articular displacements measured between the proximal and distal fragments at the central patella aspect between 1000 and 5000 cycles, together with the relative rotations of these fragments around the mediolateral axis were all significantly smaller following the lateral rim variable angle locked plating compared with tension band wiring, p ≤ 0.01.
Conclusions
From a biomechanical perspective, lateral rim variable angle locked plating of both simple and complex patella fractures provides superior construct stability versus tension band wiring under dynamic loading.
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Acknowledgements
This investigation was performed with the assistance of the AO Foundation via the AOTC System.
Funding
DePuy Synthes co-funded this study and provided all implants.
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SW, KS, WW, RC, JP, ESS, DLH and CS were involved in the conception of this study; SW, KS, IZ, and BG significantly contributed to the design of the work; SW, IZ, and BG were involved in data acquisition and analysis; All authors contributed to the interpretation of data; IZ drafted the manuscript; SW, WW, BG and CS substantively revised the manuscript. All authors have approved the submitted version.
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All donors gave their informed consent inherent within the donation of the anatomical gift statement during their lifetime. Therefore, no local or national ethical approval was necessary. This study was performed in accordance with the Declaration of Helsinki.
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Warner, S., Sommer, C., Zderic, I. et al. Lateral rim variable angle locked plating versus tension band wiring of simple and complex patella fractures: a biomechanical study. Arch Orthop Trauma Surg 144, 2131–2140 (2024). https://doi.org/10.1007/s00402-024-05266-w
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DOI: https://doi.org/10.1007/s00402-024-05266-w