Reference system for rotational positioning of femoral prosthesis

Abstract

The invention discloses a reference system for rotational positioning of a femoral prosthesis in total knee arthroplasty, namely an inner cortical plane in front of a distal femur, a part of the plane is positioned below an upper incisura of an upper patella of a femoral tackle, the inner side starts from the medial condyle, and the outer side ends at a connecting recess of the medial condyle and the lateral condyle. According to the method, an existing prosthesis rotation positioning reference system is broken through, operability and accuracy of rotation alignment of the femoral prosthesis in total knee arthroplasty are improved, and after a new reference method is applied, postoperative functional recovery of the prosthesis is expected to be enhanced, adverse events such as looseness and infection of the prosthesis are reduced, and the survival rate of the prosthesis is increased.

Description

technical field [0001] The invention relates to the medical field, in particular to a reference system for rotational positioning of a femoral prosthesis in total knee arthroplasty. Background technique [0002] The rotational alignment of the femoral prosthesis is considered to be one of the most important factors affecting the functional recovery and prosthesis survival after total knee arthroplasty (TKA). function and patient satisfaction. [0003] When performing distal femoral osteotomy during operation, ensure proper external rotation angle, if the external rotation angle is too small or even internal rotation of the femoral prosthesis is placed, it will lead to: ① Poor patella tracking and postoperative prepatellar pain; The lateral gap is small, the medial gap is small, the lateral gap is large, and the medial and lateral gaps are unbalanced, which affects postoperative joint function and stability; ③The Q angle increases, the torsional stress between the femoral pr...

AI Technical Summary

Problems solved by technology

However, in actual operation, it is difficult to identify the most convex point and increase the position error of the reference axis, which has the following defects:

[0008] ①In actual operation, the most prominent part of the medial and lateral condyles is not an exact point, but a block, so the position deviation of the line connecting the two points depends on the point taken by the surgeon himself, and the error is relatively large;

[0009] ②When there is osteophyte formation at the inner and outer epicondyles, it will interfere with the confirmation of the axis position

[0014] ① In patients with severe osteoarthritis or dysplasia of the distal femoral condyle, the osteotomy with reference to this axis will produce certain errors;

[0016] ③ Larger variability in healthy people;

[0017] ④ When hyperosteogeny is formed in the intercondylar fossa, the axis is difficult to measure;

[0019] ①The definition is vague, the confirmation of the axis depends on the operator's personal experience, and the stability is poor;

[0020] ② Large variability relative to the femoral epicondyle axis

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