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Torque screw may crack or separate. If used, an affected screw could lead to inadequate head stabilization, compromised surgical precision, procedural delays, requirement for alternate head fixation methods, and risk of patient injury.
The affected lots show a decline in performance over time, which may lead to false-negative results.
Affected implants may have undersized distal diameter along length of the shaft, which could lead to implant fatigue fracture. Potential health risk if implant fatigue fracture occurs include adverse local tissue reaction, pain or ache, non-union or malunion, or tissue damage necessitating surgical intervention.