The study analyzed the biomechanical effects of clavicle hook plate shaping, screw types, void hole placement, and void hole placement on the strength of clavicle fracture fixation using tests on synthetic models. Anterior bending of the plate provided the highest fracture force (202.75 N), significantly higher than no bending or posterior bending (p < 0.01). Conventional screws achieved greater stability than secured screws (204.08 N vs. 145.76 N, p < 0.0001). Distal empty holes significantly weakened fixation (135.38 N) compared to proximal ones (160.3 N, p < 0.0001). Invalid holes behind the plate reduced strength more than under the plate (144.75 N vs. 169.27 N, p < 0.0001). Anterior bending of the plate, conventional screws and avoidance of distal empty holes or invalid holes behind the plate improve the strength of fixation.