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Device evaluated by mfr: the engineering evaluation noted the fractured ball tip driver reported in experience (b)(4) was likely the result of applying torque greater than the yield strength of the material, which lead to shearing off of the ball-tip, which was retained in the head of a screw used with the tibial tray.The torque limiting driver handle that should have been used in this case may be in need of calibration and may have contributed to the device fracture.However, this cannot be confirmed because the reported ball tip driver or a torque limiting driver handle was not returned for evaluation.*no information provided in the following section(s): a2, a3, a4, a5, b6, b7, d4 (expiration date), d7, h4.*the following section(s) have additional info: g4, g7, h1, h2, h3, h6, and h7.
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