Walker P S, Rodger R F, Miegel R E, Schiller A L, Deland J T, Robertson D D
Orthopaedic Biomechanics Laboratory, Brigham and Women's Hospital, Boston, Massachusetts.
J Orthop Res. 1990 May;8(3):453-63. doi: 10.1002/jor.1100080317.
Earlier in vitro studies showed that a compliant layer between a metal surface and trabecular bone improved the load distribution. In this study, the behavior of a compliant layer of Dacron velour was investigated in vivo using a patella resurfacing in a sheep as a model. Bilateral cases were used to compare the velour interface with a direct metal-to-bone interface. For the metal patellas, a fibrous layer developed adjacent to the metal while the underlying bone formed a new subchondral-like layer. With the velour interface, fibrous tissue invaded the velour, followed later by bone, which sometimes reached the metal surface. For follow-ups of 8 months or more, the load across the interface was transferred over localised patches, for both the press-fit and velour interfaces. There was no significant difference in the areas of contact. There was evidence that this was due to the irregularity of the bony surface beneath the fibrous layer, or to bone nodules actually growing up to the metal. It was concluded that in this in vivo model, the velour layer did not retain a more uniform load distribution compared with the press-fit joint, due to the nature of the bone and fibrous tissue that formed at the interfaces.
早期的体外研究表明，金属表面与松质骨之间的柔顺层可改善负荷分布。在本研究中，以绵羊的髌骨表面置换为模型，对体内涤纶丝绒柔顺层的行为进行了研究。采用双侧病例，将丝绒界面与直接的金属-骨界面进行比较。对于金属髌骨，在金属附近形成了一层纤维层，而其下方的骨形成了一层新的软骨下样层。对于丝绒界面，纤维组织侵入丝绒，随后是骨组织，骨组织有时会到达金属表面。在8个月或更长时间的随访中，无论是压配界面还是丝绒界面，界面上的负荷都是通过局部斑块进行传递的。接触面积没有显著差异。有证据表明，这是由于纤维层下方骨表面的不规则性，或者是由于骨结节实际上生长到了金属表面。研究得出结论，在这个体内模型中，由于在界面处形成的骨和纤维组织的性质，与压配关节相比，丝绒层并没有保持更均匀的负荷分布。
