title: Patellofemoral kinematics after limited resurfacing of the trochlea.
abstract: Patellofemoral kinematics after a limited resurfacing of the trochlea was investigated. Patellofemoral contact pressure, area, and force were measured for intact state; after creation of a 20-mm full-thickness trochlear defect; and after trochlear resurfacing implant (Arthrosurface) in serial flexion positions (45 degrees, 60 degrees, 75 degrees). In the defect state, edge loading and peak contact forces were highest at the periphery. The chondral defect increased peak contact force (13 to 18 N, P < .01) and peak contact pressure (23 to 31 kg/cm2, P < .02) compared with the intact state. Peak contact pressure and force were restored to 90% (P < .01) and 88% (P < .01). Implantation of the device restored contact area to 85% of the intact state. Limited resurfacing of the trochlea restores contact area, peak pressure, and peak force to the intact state. These findings highlight the potential clinical use of limited patellofemoral resurfacing in trochlear chondral defects.
authors.affiliation: Division of Shoulder, Knee and Sports Surgery, Department of Orthopaedic Surgery, Naval Medical Center San Diego, 34800 Bob Wilson Dr, Ste 112, San Diego, CA 92134-1112, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Provencher
authors.forename: Neil S
authors.initials: NS
authors.lastname: Ghodadra
authors.forename: Nikhil N
authors.initials: NN
authors.lastname: Verma
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Cole
authors.forename: Stephanie
authors.initials: S
authors.lastname: Zaire
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Shewman
authors.forename: Bernard R
authors.initials: BR
authors.lastname: Bach
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D002102:Cadaver; D006801:Humans; D007719:Knee Joint / Q000033:anatomy & histology / Q000502:physiology* / Q000601:surgery*; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery; D011312:Pressure; D013499:Surface Properties