[Mechanical properties of PDS-augmented patellar tendon transplants in reconstruction of the anterior cruciate ligament].

In 25 sheep the anterior cruciate ligament (ACL) was reconstructed after resection. Twelve modified "Jones procedures" were performed (transplantation of the central third of the patellar tendon with an initial load of 50 N) and 13 polydioxanone (PDS) augmentations. In 15 cases the ACL was resected from the right knee. Twenty-one sheep survived for 1 year and were then evaluated. Loss of the ACL leads to instable joints in this experiment. Within the first 6 months anterior translation occurs; after 1 year subluxations can be seen on the X-ray films. Macroscopical signs of extensive arthrosis were seen in the femorotibial and femoropatellar joints; the menisci were totally destroyed. Macroscopically strong ligaments were seen 1 year after PDS-augmented reconstruction as well as after transplantation of the patellar tendon with an initial load of 50 N. There was no difference between the two groups. The mechanical strength reached 54% of the maximum load of a control group in the Jones reconstructions and 61% after additional augmentation with a 2-mm biodegradable PDS cord. There was no statistically significant difference. Both methods are suitable for reconstruction of the ACL; the patellar tendon replaces the ACL very well.