Tibial post impingement in posterior-stabilized total knee arthroplasty.
Reports of posterior-stabilized total knee replacements have shown excellent clinical success. However, tibial post-femoral cam impingement has been seen in modular component retrievals. This finding has been associated with transmission of rotational forces to the modular tray-polyethylene interface with subsequent backside polyethylene wear and the development of osteolysis. Femoral cam-tibial post designs that allow hyperextension and limit rotational constraint may minimize this impingement. Technical considerations including the avoidance of femoral component flexion and posterior tibial slope will minimize anterior tibial post impingement.
Callaghan
John J
JJ
Department of Orthopaedic Surgery, University of Iowa Health Care, Iowa City, 52242, USA. john-callaghan@uiowa.edu
O'Rourke
Michael R
MR
Goetz
Devon D
DD
Schmalzried
Thomas P
TP
Campbell
Patricia A
PA
Johnston
Richard C
RC
D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging; D007720:Knee Prosthesis / Q000009:adverse effects*; D008875:Middle Aged; D010014:Osteolysis / Q000000981:diagnostic imaging / Q000209:etiology; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D013314:Stress, Mechanical; D013977:Tibia / Q000000981:diagnostic imaging / Q000473:pathology*
D020959:Polyethylene