CANCELLOUS CONSTRUCTS, CARTILAGE PARTICLES AND COMBINATIONS OF CANCELLOUS CONSTRUCTS AND CARTILAGE PARTICLES

摘要

Constructs that are at least partially constructed of allograft cancellous bone are disclosed, along with cartilage particles that may be used with the constructs for repairing articular cartilage defects. A multi-piece construct (20) includes a base member (22), a cap member (30) and at least one pin (40) that secures the cap member (30) to the base member (20). The base member (22) may be constructed of mineralized cancellous bone, and is used to replace the subchondral bone removed when a surgeon cuts a bore in the area of an adjacent cartilage defect. The base member (22) includes a blind bore (23) and first and second through-going transverse bores (28, 29) in opposite sides of a wall of the base member (22). The cap member (30) includes an upper section (32) that has a thickness that is similar to that of a patient's surrounding articular cartilage layer and a stem (36) depending from the upper section (32) that is dimensioned to be received in and by the blind bore (23) of the base member (22). The stem (36) includes a transverse through-going bore (37), which may be aligned with the transverse through-going bores (28, 29) of the base member (22) to receive the pin (40) therein when the construct (20) has been assembled. The cap member (30) is at least partially formed of demineralized allograft cancellous bone, into which a mixture containing lyophilized, freeze-milled allograft cartilage particles may be infused for the repair of articular cartilage defects. The cartilage particles have a size within a range of from about 10 microns to about 210 microns.