Study of biomechanical properties of self-reinforced bioabsorbable implants for use in small bone fixation in the hand

• Autorzy: Waris, T. , Happonen, H. , Raatikainen, T. , Kaarela, O. , Tormala, P. , Santavirta, S. , Konttinen, Y. T. , Ashammakhi, N.
• Języki publikacji: EN

Abstrakty

EN

Bioabsorbable fixation devices offer a useful option to treat small bone features of the hand, if the prerequisite of reliable and stable osteofixation is met. In a biomechanical study in transversally osteotomized cadaver metacalpal bones, bioabsorbable self-reinforced (SR) poly-L/DL-lactide (P(L/DL)LA) 70/30 and polylactide-polyglycolide (PLGA) 80/20 miniplatings were compared with standard metallic fixation methods. On hundred twelve fresh-frozen metacarpals from humans had three-point bending and torsional loading after transverse osteotomy followed by fixation using seven methods: dorsal and dorsolateral 2.0-mm SR-PLGA plating, dorsal and dorsolateral 2.0-mm SR-P (L/DL)LA plating, dorsal 1.7-mm titanium plating, dorsal 2.3 mm titanium plating, and crossed 1.25-mm Kirschner wires. In apex dorsal and palmar bending, dorsal SR-PLGA and SR-P(L/DL)LA plates provided stability comparable with dorsal titanium 1.7-mm plating. When the bioabsorbable plates were applied dorsolaterally, apex palmar rigidity was increased and apex dorsal rigidity was decreased. Bioabsorbable platings resulted in higher torsional rigidity than 1.7-mm titanium plating. In another biomechanical study on obliquely (radial to ulnar orientation) osteotomized pig metacarpal bones, we compared the stabilities of various bioabsorbable fixation devices with metallic fixation devices. 1.5 mm self-reinforced poly-L-lactide (SR-PLLA) pins provided fixation rigidity comparable with 1.5 mm Kirschenr wires in dorsal and palmar apex bending, whereas in lateral apex bending and in torsion the rigidity was equal to that of 1.25 mm Kirschner wires 2.0 mm SR-P(L/DL)LA screws provided rigidity comparable with that of 1.5 mm Kirschner wires in all testing modes. The bioabsorbable plate considerably enhanced the bending stabilities of the fixation system, but a single interfragmentary screw provided only limited rotational rigidity. The results demonstrate that using ultra-high strength SR implants, adequate fixation stability for hand fracture fixation can be achieved. These findings suggest that bioabsorbable miniplating can be used safely in the clinical stabilization of metacarpal and phalangeal fractures.

Słowa kluczowe

PL

bioabsorpcja; implanty

EN

bioabsorbable; bioabsorbable implants; implants

• Czasopismo: Inżynieria Biomateriałów
• Rocznik: 2004
• Tom: R. 7, nr 38-42
• Strony: 15-15

Twórcy

autor

Waris, T.

• Institute of Biomedicine/Anatomy, Biomedicum Helsinki, University of Helsinki, Finland

autor

Happonen, H.

• Linvatec Biomaterials Ltd., Tampere, Finland

autor

Raatikainen, T.

• Helsinki University Central Hospital, Helsinki, Finland

autor

Kaarela, O.

• Department of Surgery, Oulu University Hospital, Oulu, Finland

autor

Tormala, P.

• Institute of Biomaterials, Tampere University of Technology, Tampere, Finland

autor

Santavirta, S.

• Helsinki University Central Hospital, Helsinki, Finland

autor

Konttinen, Y. T.

• Helsinki University Central Hospital, Helsinki, Finland

autor

Ashammakhi, N.

• Department of Surgery, Oulu University Hospital, Oulu, Finland