M. Lowery (Shreveport, US)
LSUHSC - ShreveportPresenter Of 1 Presentation
18.1.7 - Ideal Donor Site for Osteochondral Autografting of the Distal Femur Using Radius of Curvature: a 3D High-Resolution Scanner Comparison
Abstract
Purpose
Matching donor and recipient site curvature is a known challenge when performing osteochondral autograft transfers (OAT) for articular lesions of the distal femur. Using radius of curvature (ROC), our purpose is to determine ideal donor sites for various recipient sites. We hypothesize that certain donor regions will have a ROC different than certain recipient regions.
Methods and Materials
Nineteen cadaveric femurs were scanned with a high-resolution sensor. Multiple points within four recipient and four donor regions were analyzed. Grafts with six, eight, and ten-millimeter diameter were simulated and average ROC for each region was calculated. Recipient regions analyzed were the distal medial (DMFC) and lateral femoral condyles (DLFC) as well as the posterior medial (PMFC) and lateral femoral condyles (PLFC). Donor regions were the lateral (LTR) and medial trochlear ridges (MTR) as well as the lateral (LICN) and medial intercondylar notch (MICN). Figure 1 shows example of a 3D scan.
Results
Analyzing 6mm grafts, we found no significant difference in ROC of the LICN and all recipient sites(p=.061,.062,.310,.475). The same was true for the LTR donor site(p=.980,.254,.257,.783). A significant difference was found between the MTR and both the DMFC and DLFC(p=.009,.009). No significant difference was found between the MTR and the PMFC and PLFC(p=.078,.144). The MICN had a significantly different ROC than each recipient site(p<.001). For 8mm grafts, only the MICN had a significantly different ROC compared to recipient sites(p<.05). Analyzing 10mm grafts, there were no significantly different comparisons of donor and recipient site ROC(p>.05). Figure 2 displays our primary findings.
Conclusion
When using 6mm OAT plugs, our study demonstrates that the LICN and LTR are excellent harvest options for all recipient sites on the femoral condyles with respect to ROC. For 8 mm plugs, the LICN, LTR, and MTR were acceptable donor sites. For 10 mm plugs, all 4 donor sites were acceptable.