title: Tibial post impingement in posterior-stabilized total knee arthroplasty.
abstract: 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.
authors.affiliation: Department of Orthopaedic Surgery, University of Iowa Health Care, Iowa City, 52242, USA. john-callaghan@uiowa.edu
authors.forename: John J
authors.initials: JJ
authors.lastname: Callaghan
authors.forename: Michael R
authors.initials: MR
authors.lastname: O'Rourke
authors.forename: Devon D
authors.initials: DD
authors.lastname: Goetz
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Schmalzried
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Campbell
authors.forename: Richard C
authors.initials: RC
authors.lastname: Johnston
mesh_terms: 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*
chemical_list: D020959:Polyethylene