title: Survival of primary condylar-constrained total knee arthroplasty at a minimum of 7 years.
abstract: The purpose of the present study is to retrospectively analyze clinical and radiographic outcomes in primary constrained condylar knee arthroplasty at a minimum follow-up of 7 years. Given the concern for early aseptic loosening in constrained implants, we focused on this outcome. Our cohort consists of 127 constrained condylar knees. The mean age of patients in the study was 68.3 years, with a mean follow-up of 110.7 months. The diagnosis was primary osteoarthritis in 92%. There were four periprosthetic distal femur fractures, with a rate of revision of 0.8%. No implants were revised for aseptic loosening. Kaplan-Meier survivorship analysis with removal of any component as the end point revealed that the 10-year rate of survival of the primary CCK was 97.6% (95% CI, 94%-100%).
authors.affiliation: Division of Adult Reconstruction, Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, Pennsylvania.
authors.forename: Lance M
authors.initials: LM
authors.lastname: Maynard
authors.affiliation: Division of Adult Reconstruction, Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, Pennsylvania.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Sauber
authors.affiliation: Division of Adult Reconstruction, Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, Pennsylvania.
authors.forename: Vasileios K
authors.initials: VK
authors.lastname: Kostopoulos
authors.affiliation: Division of Adult Reconstruction, Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, Pennsylvania.
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Lavigne
authors.affiliation: Division of Adult Reconstruction, Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, Pennsylvania.
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Sewecke
authors.affiliation: Division of Adult Reconstruction, Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, Pennsylvania.
authors.forename: Nicholas G
authors.initials: NG
authors.lastname: Sotereanos
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods*; D005500:Follow-Up Studies; D006801:Humans; D053208:Kaplan-Meier Estimate; D007720:Knee Prosthesis; D020370:Osteoarthritis, Knee / Q000601:surgery*; D057068:Periprosthetic Fractures / Q000209:etiology; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012189:Retrospective Studies; D016896:Treatment Outcome
keywords: constrained condylar knee; osteoarthritis; total knee arthroplasty