清理掉所有病灶软骨下骨的残余纤维组织。
For all patients, residual fibrotic tissue of subchondral bone was removed from the defect.
结论：髌骨外侧关节面软骨下骨骨质最为坚固。
Conclusion: The optimum level of patella of the retropatellar articular surface is lateral facet.
这导致应力分布不均匀地传导至深层软骨及其下面的软骨下骨。
This results in uneven distribution of stress transmission to deeper layers of cartilage and to the underlying subchondral bone.
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