title: Short-term outcomes of unresurfaced patellas in total knee arthroplasty.
abstract: Selective patellar resurfacing continues in total knee arthroplasty (TKA). We define the demographics of patients selected for this procedure and report their short-term, aseptic revision rate. A community-based Total Joint Replacement Registry (TJRR) comprising 39,000 TKAs with median follow-up of 24.5 months was evaluated. Patients who underwent bicompartmental TKA were younger (p < 0.001), suffered posttraumatic arthrosis (p < 0.001), and receive hybrid fixation (p < 0.001). In multivariate analysis, the unresurfaced patella is an independent risk factor for early revision with a relative increased risk of 2.3 (95% CI, 1.4-3.7). The cumulative survivorship at 6 years for tricompartmental TKA is 98.1 versus 93.6% for bicompartmental knees (p < 0.001). Despite selecting patients with presumably healthier patellofemoral joints for bicompartmental TKA, the unresurfaced patella remains a risk factor for early revision.
authors.affiliation: Department of Orthopaedic Surgery, Kaiser Permanente, Los Angeles, CA, USA. monti.x.khatod@kp.org
authors.forename: Monti
authors.initials: M
authors.lastname: Khatod
authors.forename: Maria C S
authors.initials: MC
authors.lastname: Inacio
authors.forename: Stefano
authors.initials: S
authors.lastname: Bini
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects* / Q000379:methods; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000150:complications / Q000473:pathology / Q000601:surgery*; D010329:Patella / Q000601:surgery*; D018579:Patient Selection; D011475:Prosthesis Failure; D012086:Reoperation; D012307:Risk Factors; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult