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Critical Reviews™ in Biomedical Engineering
SJR: 0.243 SNIP: 0.376 CiteScore™: 0.79

ISSN Print: 0278-940X
ISSN Online: 1943-619X

Critical Reviews™ in Biomedical Engineering

DOI: 10.1615/CritRevBiomedEng.v28.i12.60
pages 23-32

The Biomechanical and Surgical Solutions for Patella Implant in Total Knee Arthroplasty

David G. Mendes
The Center for Implant Surgery, Bnai Zion Medical Center, Haifa, Israel
Mazen Said
The Center for Implant Surgery, Bnai Zion Medical Center, Haifa, Israel
Sorin Head
The Center for Implant Surgery, Bnai Zion Medical Center, Haifa, Israel
Edmond Sabo
The Center for Implant Surgery, Bnai Zion Medical Center, Haifa, Israel
Ricardo Nachman
The Center for Implant Surgery, Bnai Zion Medical Center, Haifa, Israel
Jochanan H. Boss
The Center for Implant Surgery, Bnai Zion Medical Center, Haifa, Israel

ABSTRACT

A basic fault in designs of patella implants that calls for a prompt remedy is the inadequate polyethylene thickness in contact areas. The requirement for thickness of patella implants should be similar to the requirement set up by the FDA in 1993 regarding the tibial implants, that is, a minimal thickness of 8 mm.
A solution is presented for the optimal design of the patella implant and for the appropriate surgical technique.
The implant's undersurface that fixes to bone is concave and has a 1-cm wide but 5 to 6 mm short central peg that does not risk the integrity of the bone. Fixation of the concave aspect to the convex aspect of the bony patella strongly enhances resistance to medio-lateral and supero-inferior shear forces.
The circumferential facet of the implant 8 mm thick assures uniform thickness of the entire implant and assures optimal mechanical properties of the polyethylene.
The articulating surface is tailored to conform to the corresponding femoral trochlear groove and condyles. It can be made to fit any femoral component of any knee implant.


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