In this biomechanical study, the strength of five different fixation techniques -anterior tension band wiring with K-wires, separate vertical wiring, headless compression screws with anterior tension band wiring, cannulated screws with tension band wiring and memory shape patellar fixator- for distal patellar fractures were compared. Forty calf knees were used for the biomechanical testing. Each specimen was pre-loaded with 10 N at 1 N/s. The distraction forces were applied consistently with the velocity of 5 mm/s. The ultimate load (N) and displacement (mm) values were recorded. The headless compression screw with anterior tension band wiring (656.9±167.9 N) and the cannulated screws with anterior tension band wiring (642.6±166.0 N) obtained significantly higher ultimate loading values compared to the other fixation methods (p<0.05). Fixation via cannulated screws with anterior tension band wiring techniques are more stabile than the patellar shape memory fixator and anterior K wire fixation.
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