Topographic Analysis of the Distal Femoral Condyle Articular Cartilage Surface: Adequacy of the Graft from Opposite Condyles of the Same or Different Size for the Osteochondral Allograft Transplantation.
OBJECTIVE
To analyze the topography of the opposite condyle to treat focal femoral condyle articular defects with an osteochondral allograft (OCA).


DESIGN
Three groups were created: Group 1, same condyle with same width; Group 2, opposite condyle with same width; Group 3, opposite condyle with different width. Computed tomography (CT) of 22 cadaveric femoral hemi-condyles was used to create 3-dimensional CT models that were exported into point-cloud models. Three zones of the donor condyle (anterior, middle, and posterior) were quantified. Four defect sizes were created (15, 18, 23, 25 mm) at the weight-bearing region. The defect was moved throughout each donor condyle zone and the least distance was calculated, defined as the shortest distance between the defect and the donor condyle.


RESULTS
The mean least distance increased with larger defect size in all groups, yet there was a less than 0.2 mm difference in the least distance among defect sizes. The 15, 18, and 23 mm defect models in Group 1 exhibited greater least distances at the anterior than middle and posterior zones. The 15 mm defect model exhibited greater least distance at the anterior zone than posterior zone in Group 3. However, there was a less than 0.05 mm difference in the mean least distance between zones. There was no significant difference in the least distance between groups.


CONCLUSION
OCAs from opposite condyles yield similar topographic matching to OCAs from the same condyles, suggesting that opposite condyles can be utilized. Clinical correlation and outcomes are necessary.
['Yanke|Adam B|AB|', 'Urita|Atsushi|A|', 'Shin|Jason J|JJ|', 'Cvetanovich|Greg L|GL|', 'Moran|Erin K|EK|', 'Bach|Bernard R|BR|', 'Cole|Brian J|BJ|', 'Inoue|Nozomu|N|', 'Verma|Nikhil N|NN|']
D064591:Allografts D016025:Bone Transplantation D001842:Bone and Bones D002102:Cadaver D002358:Cartilage, Articular D005269:Femur D006801:Humans D007719:Knee Joint D014015:Tissue Banks D014057:Tomography, X-Ray Computed D014184:Transplantation, Homologous
distal femoral condyle osteochondral allograft topography