Head‐locking durability of fixed and variable angle locking screws under repetitive loading
摘要：
Polyaxial locking screws are increasingly applied in fracture fixation. To investigate the durability of the head-locking mechanism, the removal torque of variable angle (VA) and fixed angle (FA) stainless steel and titanium locking screws was investigated without and after a cyclic loading test. Stainless steel (St) and titanium (Ti) 2.4mm orthogonally inserted FA screws and 2.4mm VA screws inserted in different inclinations (0°–15°) ( n =6 per group) were locked at 0.8Nm. Removal torque was determined without (W) and after (A) cyclic loading (sinusoidal load, 5Hz, constant amplitude of 25N, up to 10′000 cycles, or failure). Significant differences in-between the groups were detected by Student's t -test ( p
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关键词：
polyaxial locking variable angle locking screw removal torque locking durability fixed angle locking
DOI：
10.1002/jor.23108
年份：
2016
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