Patellofemoral Kinematics After Limited Resurfacing of the Trochlea

Matthew Provencher; Neil S. Ghodadra; Nikhil N. Verma; Brian J. Cole; Stephanie Zaire; Elizabeth Shewman; Bernard R. Bach

doi:10.1055/s-0030-1247768

The Journal of Knee Surgery, Inhaltsverzeichnis

J Knee Surg 2009; 22(4): 310-316
DOI: 10.1055/s-0030-1247768

Original Article

Patellofemoral Kinematics After Limited Resurfacing of the Trochlea

Matthew Provencher¹ , Neil S. Ghodadra² , Nikhil N. Verma³ , Brian J. Cole³ , Stephanie Zaire⁴ , Elizabeth Shewman² , Bernard R. Bach³ Jr

¹The Division of Shoulder, Knee and Sports Surgery, Department of Orthopaedic Surgery, Naval Medical Center San Diego, San Diego, Calif
²Rush University Medical Center, Chicago, Ill
³Midwest Orthopedics at Rush, Chicago, Ill
⁴George Washington University, Washington, DC

Abstract

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°, 60°, 75°). 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.

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