In vivo and in vitro investigation of the long-term behavior and fatigue strength of XXXX fiber ligament replacement.

@entity505 @entity397 @entity742
The long-term behavior of @entity505 fiber ligament replacements was evaluated in @entity742 . In vitro assessments of both isolated @entity505 fiber prostheses and resected animal ligaments were performed. The right knee in 45 @entity742 was reconstructed. In 30 animals, only the medical collateral ligaments were replaced, but with different systems of anchorage to bone. In 15 animals, a combined replacement of medial collateral ligament and anterior cruciate ligament was performed. In the first group the animals were sacrificed three months postoperation, while in the latter group evaluation was performed one year after surgery. After one year the strength of the medial collateral ligament complex was higher than that of the normal @entity742 ligaments. The elasticity and extensibility were similar to those of the normal ligaments. No case of @entity397 or @entity397 of the medial collateral ligament replacements was seen, but four of 12 anterior cruciate replacements showed signs of @entity397 . In vitro testing showed that @entity397 is more likely to occur where movement occurs around a small radius of bending, and this may be a factor in these cases where the anterior cruciate ligament enters a bony tunnel at an acute angle. Histologic assessment showed good biocompatibility, similar to that reported by other authors. With an operative technique designed to increase the radius of bending where the @entity505 fiber enters bone, these ligament replacements have a fatigue strength and elasticity adequate for long-term survival.
