In this study, we tested the stability of the xenograft SURGIBONE and of human iliac crest graft depending on the donor's bone density. The mean load bearing capacity of SURGIBONE was 4816 N, the compressive strength 32.8 N/mm2. This even exceeds the values given by the producer. Yet in clinical use the material caused problems by collapses or lysis of the graft. According to our results, those failures can not be explained by missing primary stability. Perhaps there is a immunogenic reaction of the host against the remaining protein as it once was proved for the "kielspan"-graft. The iliac crest grafts of donors with normal bone density had a load bearing capacity of 3397 N. Grafts of donors with reduced bone density of less than 60 mg/ml Ca-Equivalent showed reduced load bearing capacities of 2265 N. DEXA (Dual-Energy X-Ray Absorptiometry) seems to be suitable to scan preoperatively the iliac crest graft stability in order to recognize the danger of reduced stability by osteoporosis.

Absorptiometry, Photon↗

PubMedDate not supplied

[Use of holographic interferometry in experimental biomechanics].

Deformation measurements by means of holographic interferometry are of special interest in the fields of osteosynthesis and endoprosthesis research. For osteosynthesis with compression plates holography gives immediately information about the patterns of deformation and thus, the conduction of forces in the system plate-screws fixed to the bone. The mechanical reaction of bone to the design of hip endoprosthesis stems under load can be made visible and in both cases quantitative information is given by calculating the lines of bending.

Biomechanical Phenomena↗