An operation method of the biological patellar groove replacement assembly, wherein the biological patellar groove replacement assembly comprises a prosthesis (10), a trial implant (20) and a base block (30),
- an upper surface (101) of the prosthesis being a continuous curved surface defining a patellar groove, a lower surface (102) of the prosthesis being generally horizontally oriented, the lower surface (102) of the prosthesis provided thereon with a centrally arranged first mounting peg (11) and a second mounting peg (12) arranged near an outer peripheral edge of the prosthesis (10), cylindrical bodies of the first mounting peg (11) and the second mounting pegs (12) extending from the lower surface (102) of the prosthesis away from the upper surface (101) of the prosthesis,
- an upper surface (201) of the trial implant having a contour generally coinciding with that of the upper surface (101) of the prosthesis, a lower surface (202) of the trial implant being generally horizontally oriented, the upper surface (201) of the trial implant and the lower surface (202) of the trial implant having a maximum height difference consistent with a maximum height difference of the upper surface (101) of the prosthesis and the lower surface (102) of the prosthesis, the trial implant (20) defining locating holes (21) extending through the upper surface (201) of the trial implant and the lower surface (202) of the trial implant and tuning holes (22) extending through side wall surfaces (203) of the trial implant and the lower surface (202) of the trial implant, cores of the locating holes (21) having orientations at the lower surface (202) of the trial implant coinciding with orientations of cores of the second mounting pegs (12) at the lower surface (102) of the prosthesis,
- the base block (30) generally resembling a plate, the base block (30) defining a first locating hole (31) and second locating holes (32), all extending through an upper surface (301) of the base block and a lower surface (302) of the base block, a core of the first locating hole (31) having an orientation at the lower surface (302) of the base block coinciding with an orientation of a core of the first mounting peg (11) at the lower surface (102) of the prosthesis, cores of the second locating hole (32) having orientations at the lower surface (302) of the base block coinciding with orientations of cores of the second mounting pegs (12) at the lower surface (102) of the prosthesis;
- wherein the operation method comprises following steps:
- A. with the lower surface (202) of the trial implant fitting against an osteotomy surface of a femur, applying pointed shafts through the tuning holes (22) and inserting them into the osteotomy surface of the femur, thereby preliminarily positioning the trial implant (20);
- B. determining whether a lengthwise direction and tilt angle of a patellar groove of the upper surface (201) of the trial implant are consistent with a designed patellar track and, if so, proceeding to step C, or otherwise, removing the pointed shafts, tuning an orientation of the trial implant (20) and looping back to step A;
- C. applying second drilling shafts through the locating holes (21) in the trial implant (20) and drilling second mounting holes in the osteotomy surface of the femur;
- D. with the second drilling shafts being retained engaged with the osteotomy surface of the femur, pulling off the pointed shafts, separating the trial implant (20) from the osteotomy surface of the femur and then guiding it out along shaft bodies of the second drilling shafts;
- E. with the second drilling shafts being inserted into the second locating holes (32) of the base block (30), guiding the base block (30) down along the shaft bodies of the second drilling shafts until it fits against the osteotomy surface of the femur, applying a first drilling shaft through the first locating hole (31) of the base block (30) and drilling a first mounting hole in the osteotomy surface of the femur;
- F. separating the base plate (30) from the osteotomy surface of the femur, guiding it out along the shaft bodies of the first and second drilling shafts and removing the first and second drilling shafts;
- and
- G. with the first mounting peg (11) of the prosthesis (10) abutting against an opening edge of the first mounting hole and the second mounting pegs (12) of the prosthesis (10) abutting against opening edges of the second mounting holes, securely press-fitting the prosthesis (10) onto the osteotomy surface of the femur so that the lower surface of the prosthesis (101) fits against the osteotomy surface of the femur, completing implantation of the prosthesis (10).