Trochlear resurfacing system and method

摘要

A system for repairing a defect on an articular surface of a patient's trochlear region, the system comprising a guide block comprising a body having an exterior surface configured to engage with the saddle portion and ridge portions of the patient's trochlear region, a protrusion extending generally from the body and configured to be received in a first bore formed in the articular surface along a reference axis, and a first cavity extending through the body configured to establish a first working axis displaced from the reference axis, wherein the exterior surface of the body and the protrusion are configured to secure the location of the guide block about the patient's trochlear region. A method for preparing an implant site in bone, comprising: establishing a reference axis extending from the bone; creating a bore in the bone by reaming about the reference axis; securing a guide block about the articular surface; establishing a first working axis extending from the bone using the guide block, the first working axis is displaced from the reference axis; and creating a first socket in the bone by reaming about the first working axis, wherein the first socket partially overlaps with the bore.

主权项

1. A system for repairing a defect on a patient's articular surface of a bone, said system comprising:
one or more reamers, each of which comprises a shaft and a cutting head extending radially outward beyond said shaft; and a guide block comprising:
a body having an exterior surface configured to engage against said articular surface of said bone, said guide block including at least one opening and a first and a second passageway, said first and said second passageway extending from said at least one opening through said guide block along a first and a second working axis, respectively, and each having a cross-section substantially corresponding to a cross-section of the shaft of at least one of said reamers, said at least one opening to receive the cutting head of one or more of said reamers in a first and a second position between said guide body and said articular surface when said exterior surface of said body engages against said articular surface and the shaft of said one or more reamers is received in said first and said second passageway, respectively;wherein said first and said second passageways are to align said one or more reamers such that the shaft is centered along said first and said second axis and said cutting head is disposed in said first and said second positions of said at least one opening corresponding to a first and a second portion of an excision site, respectively, extending through said articular surface and only partially into said bone beneath said articular surface, andwherein said guide block and said one or more reamers are configured to control a depth of the excision site as said shaft is advanced within said guide block.