Knee Sizing And Balancing Instrument

摘要

A method of sizing and balancing a knee including: placing an integrated orthopedic instrument in contact with a resected distal femoral surface of a femur of a knee in flexion such that medial and lateral posterior feet of a tensor frame of the instrument are in contact with posterior condyles of the femur and such that medial and lateral posterior feet of a sizer body of the instrument are positioned on a spacer placed on a resected proximal surface of the patient's tibia; securing first and second wings extending from a central portion of the tensor frame on the resected distal femoral surface; rotating the sizer body relative to the tensor frame via a rotation mechanism that connects the sizer body and the tensor frame to balance the ligaments; and sizing the patient's femur by moving a stylus coupled to the sizer body on an anterior surface of the femur.

主权项

1. An orthopedic instrument for knee arthroplasty comprising:
an anterior-posterior sizer assembly having a stylus, a sizer body including medial and lateral posterior feet extending substantially perpendicularly from the sizer body, and a sizer slider slidable relative to the sizer body along a medial-lateral direction relative to a patient's knee, the sizer body having a channel therethrough; a tensor assembly including a tensor frame having a central portion, medial and lateral wings extending at an angle from the central portion, a tab extending from the central portion between the medial and lateral wings and having an elongated aperture, and medial and lateral posterior feet extending substantially perpendicularly to the central portion; a plate having an angular scale on a first side and a recess on a second side opposite the first side and facing the sizer body; a knob rotatably received in the recess of the plate, the knob having a cam groove on a side facing the sizer body; and a cam slider slidably supported in the channel of the sizer body in a medial-lateral direction, the cam slider including a first post guidable by the cam groove of the knob and a second post movably received in the elongated aperture of the tensor frame, such that rotating the knob rotates the sizer body relative to the tensor frame and changes a relative gap between the corresponding posterior feet of the sizer body and the tensor frame.