MR imaging in biofix-osteosynthesis

Purpose: Osteosynthesis by means of bioresorbable implants, mostly of self- reinforced poly-L-lactide (SR-PLLA), has been used in humans for about 10 y ears. The aim of this study was to examine the controversy between histolog ical studies confirming fragmentation of the biomaterial and radiological s tudies showing no breaking of the material. Material and Methods. Six patients with displaced malleolar fractures opera tively treated with biodegradable SR-PLLA screws underwent MR examinations at 1.5 T, immediately postoperatively and after one to two years. Results: The biodegradable osteosynthetic screws were clearly seen on all M R images. Of 12 screws, 6 were broken at the final examination (5 syndesmot ic transfixation screws and 1 screw through the growth cartilage). Conclusion: The breaking of a biodegradable osteosynthesis is possible to d ocument on MR images.