Patellar retractor and method of surgical procedure on knee
The distal end part of the retractor according to the invention is provided both with terminal tips for abutment on one of the femoral condylar walls which define therebetween the intercondylar space, and with a wing extending laterally in projection from this end part in order to form a frontal surface for thrust, in a medial-lateral direction, of that part of the quadriceps muscle tendon containing the patella when the tips are in abutment in the intercondylar space. By using this retractor as a lever, the wing efficiently reclines the patella, without turning it completely on itself, entirely exposing one of the femoral condyles. This invention is more particularly applicable to a surgical procedure for implanting a unicompartmental knee prosthesis.
1. A method of performing a surgical procedure on a knee comprising the following successive steps of:
Incising an anterior zone and one of an external or internal zone of the knee to form an incision;
holding back edges of the incision to reveal at least part of a corresponding external or internal femoral condyle of the knee;
introducing a pointed distal end of a patellar retractor into a femoral intercondylar space of the knee through the incision;
abutting the pointed distal end on a wall of the revealed condyle facing the femoral intercondylar space; and
pushing part of a quadriceps muscle tendon containing the patella in a medial-lateral direction towards the unrevealed condyle to dislocate a patella of the knee using the patellar retractor as a lever.
2. The method of claim 1 , wherein the patellar retractor includes an elongated body having a distal end part provided with at least one terminal tip for abutment on a femoral condylar wall and a wing extending laterally in projection from the distal end part to form a frontal surface for thrusting the part of the quadriceps muscle tendon containing the patella when the tip is in abutment in the femoral intercondylar space.
3. The method of claim 1 , wherein introducing the pointed end of the patellar retractor in the femoral intercondylar space comprises sliding the pointed end successively against a front wall of the revealed condyle and a wall turned towards the femoral intercondylar space of the revealed condyle.
4. The method of claim 1 , wherein pushing the part of the quadriceps muscle tendon containing the patella comprises sliding the patella laterally on an anterior face of a lower epiphysis of a femur of the knee.
5. The method of claim 1 , wherein pushing the part of the quadriceps muscle tendon containing the patella comprises maintaining a posterior face of the patella directed towards a femur of the knee.
6. A method of implanting a knee prosthesis comprising:
incising a front part of a knee to form an incision to reveal at least part of a femoral condyle;
introducing a distal end of a patellar retractor into a femoral intercondylar space of the knee through the incision, wherein the distal end of the patellar retractor includes a surface portion and a tip portion;
abutting the tip portion of the distal end on a wall of the femoral condyle facing the femoral incondylar space to form a resistant point of abutment;
contacting the surface portion of the distal end against a tendon of a quadriceps muscle;
pushing part of the quadriceps muscle tendon with the patellar retractor to recline a patella of the knee; and
implanting a prosthesis within the incision.
7. The method of claim 6 , further comprising preparing the femoral condyle for implantation.
8. The method of claim 7 , further comprising implanting a prosthesis at the femoral condyle.