Patent ID: 9107757
Filing Date: 2015-08-18
Classification: A61F

Abstract:
1. An orthopaedic surgical instrument assembly, comprising: a tibial bearing trial including an articulation surface and a bottom surface opposite the articulation surface, a tibial base trial adapted to be positioned on a surgically-prepared proximal end of a patient's tibia, the tibial base trial includes an upper surface engaged with the bottom surface of the tibial bearing trial, a base fastener attached to the tibial base trial, the base fastener including a shaft configured to rotate relative to the tibial base trial, a stem adaptor secured to the shaft of the base fastener, the stem adaptor including (i) a first adaptor body engaged with a lower surface of the tibial base trial, the first adaptor body defining a first axis, and (ii) a second adaptor body pivotally coupled to the first adaptor body, the second adaptor body defining a second axis extending parallel to the first axis, wherein when the second adaptor body is in a fixed position, the first adaptor body is configured to pivot relative to the second adaptor body to move the first axis a circular path about the second axis, and a stem trial secured to the second adaptor body of the stem adaptor, the stem trial including an elongated body shaped to be positioned in an intramedullary canal of the patient's tibia, wherein the stem trial has an externally-threaded upper end, and the second adaptor body has an internally-threaded lower end that receives the externally-threaded upper end of the stem trial.