MR imaging in biofix-osteosynthesis.
OBJECTIVE
Osteosynthesis by means of bioresorbable implants, mostly of self-reinforced poly-L-lactide (SR-PLLA), has been used in humans for about 10 years. The aim of this study was to examine the controversy between histological studies confirming fragmentation of the biomaterial and radiological studies showing no breaking of the material.


METHODS
Six patients with displaced malleolar fractures operatively 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 MR images. Of 12 screws, 6 were broken at the final examination (5 syndesmotic transfixation screws and 1 screw through the growth cartilage).


CONCLUSIONS
The breaking of a biodegradable osteosynthesis is possible to document on MR images.
Department of Radiology, Helsinki University Hospital, Finland.
M
M
Lohman
E K
EK
Partio
T
T
Vehmas
A
A
Kivisaari
L
L
Kivisaari
D020341:Absorbable Implants; D000293:Adolescent; D000328:Adult; D000368:Aged; D016512:Ankle Injuries / Q000175:diagnosis* / Q000601:surgery; D001863:Bone Screws; D005360:Fibula / Q000293:injuries / Q000473:pathology / Q000601:surgery; D005500:Follow-Up Studies; D005594:Fracture Fixation, Intramedullary / Q000295:instrumentation*; D050723:Fractures, Bone / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011100:Polyglycolic Acid; D013978:Tibial Fractures / Q000175:diagnosis / Q000601:surgery
D011100:Polyglycolic Acid