Orthopaedic surgical instrument system and method for detaching trial construct assemblies

A surgical instrument system, comprising:

• a femoral prosthetic trial component including (i) a medial condyle spaced apart from a lateral condyle, (ii) an intercondylar notch positioned between the medial condyle and the lateral condyle, (iii) a post extending outwardly from a proximal bone facing surface of the femoral prosthetic trial component and including an annular groove, and (iv) a passageway that extends through the post and opens into the intercondylar notch, and
• an orthoapedic surgical instrument configured to engage the femoral prosthetic trial component, the orthopaedic surgical instrument comprising:
• an elongated body extending along a longitudinal axis and sized to be inserted into the passageway extending through the post, the elongated body including a distal tip including at least one flange extending radially outwardly therefrom configured to expand and contract relative to the longitudinal axis between an expanded position and a contracted position, wherein the elongated body includes a central shaft having an end that is segmented into a plurality of cantilevered arms that extend outwardly from the central shaft to define the distal tip of the elongated body, such that in the expanded position the at least one flange is received into the annular groove for securing the femoral prosthetic trial component to the orthopaedic surgical instrument, and in the contracted position the at least one flange disengages the annular groove for releasing the femoral prosthetic trial component from the orthopaedic surgical instrument,
• a bore extending through the elongated body along the longitudinal axis,
• a rod positioned within the bore and moveable along the longitudinal axis, the rod including a distal end configured to selectively engage the distal tip of the elongated body to move the distal tip between the expanded position and the contracted position, and
• a linkage assembly coupled to a proximal end of the rod, the linkage assembly being moveable between a first position in which the distal end of the rod engages the distal tip of the elongated body and the distal tip is in the expanded position and a second position in which the distal end of the rod is disengaged from the distal tip and the distal tip is in the contracted position.