Patent ID: 7371260

Claim:
A method of preparing an osteochondral allograft, the method comprising: (i) removing from a donor site an allograft plug having a cartilage plate and cancellous bone tissue extending therefrom comprising: (a) attaching a guide plate to a donor bone at a location opposite the donor site, the guide plate having a first guide cylinder having a first bore and a second guide cylinder having a second bore, the second guide cylinder removably insertable into the first guide cylinder; (b) inserting a first crown saw having a first diameter through the second bore and into the donor bone a first depth to a point proximate the cartilage plate of the donor site; (c) removing the second guide cylinder from the first guide cylinder; and (d) inserting a second crown saw having a second diameter, wherein the second diameter is different than the first diameter, through the first bore a distance beyond the first depth across the donor bone and through the cartilage plate of the donor site to detach a portion of bone tissue from the donor bone; and (ii) shaping the allograft plug to remove cancellous bone tissue to form a cancellous stalk.