title: The effect of drill hole size on the fixation strength of a cemented prosthetic patellar button.
abstract: This study used a cadaver model to analyze the fixation strength of 3 different patellar resurfacing preparations using an all-polyethylene patellar component. One of 3 drill hole sizes was randomly selected and used to prepare the patella. The entire construct was cemented, mounted to a servohydraulic testing machine, cycled between 0 and 50 N, and then tested to failure. Mean forces obtained prior to failure were 258.5, 293, and 353.1 N for the chamfer, 4.5-mm, and 9.5-mm drill holes, respectively. There was a statistically significant difference in strength to failure between the 9.5-mm and chamfer drill hole sizes. These findings may help to reduce patellar implant failures.
authors.affiliation: State University of New York at Buffalo, University Orthopaedic Center, Southtowns, 3671 Southwestern Boulevard, Orchard Park, NY 14127, USA.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Rauh
authors.forename: Lindsey D
authors.initials: LD
authors.lastname: Clark
authors.forename: Hardik
authors.initials: H
authors.lastname: Shah
authors.forename: Kenneth A
authors.initials: KA
authors.lastname: Krackow
authors.forename: William M
authors.initials: WM
authors.lastname: Mihalko
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods*; D002102:Cadaver; D002484:Cementation / Q000379:methods*; D017276:Friction; D006801:Humans; D010027:Osteotomy / Q000379:methods*; D010329:Patella / Q000601:surgery*; D013314:Stress, Mechanical