title: Strontium-impregnated bioabsorbable composite for osteoporotic fracture fixation.
abstract: Osteoporosis impairs the bone-healing process as well as bone fracture fixation. The intervention of osteoporosis is considered to be one part of bone fracture treatment. Thus, orthopedic fixators impregnated with antiosteoporosis regimens will improve fracture fixation in osteoporotic bone. In this study, the strontium (Sr) and calcium phosphate ceramic (CPC) were mixed first and then mixed with poly(ε-caprolactone) (PCL) to fabricate a bioactive and bioabsorbable bone fixators. The prepared Sr-CPC/PCL screws were implanted into the distal femur of ovariectomized rabbits. The results showed that Sr-CPC/PCL composite had the appropriate mechanical properties, good biocompatibility, and radio-opacity. The Sr addition created a porous structure and accelerated the degradation of bone screws, but the degradation products did not acidify the surrounding environment. For osteoporotic animals, favorable osteointegration around the Sr-CPC/PCL screws was found, and the total porosity of trabecular bone was decreased under the inspections of micro-computerized tomography. Compared with PCL or CPC/PCL screw, animals which received Sr-CPC/PCL were found to have better results in terms of trabecular number, thickness, and separation. This study reveals that the Sr-impregnated bone fixator improves osseointegration in osteoporotic animals. Sr-CPC/PCL composite is a good candidate material for osteofixation in osteoporotic patients.
authors.affiliation: Department of Orthopedics, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, 10002, Taiwan.|Department of Orthopedics, En Chu Kong Hospital, New Taipei City, 23702, Taiwan.
authors.forename: Chang-Chin
authors.initials: CC
authors.lastname: Wu
authors.affiliation: School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei, 11031, Taiwan.
authors.forename: Chih-Lin
authors.initials: CL
authors.lastname: Kuo
authors.affiliation: School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei, 11031, Taiwan.
authors.forename: Fang-Yu
authors.initials: FY
authors.lastname: Fan
authors.affiliation: School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei, 11031, Taiwan.
authors.forename: Kai-Chiang
authors.initials: KC
authors.lastname: Yang
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001863:Bone Screws; D005260:Female; D050723:Fractures, Bone / Q000209:etiology / Q000378:metabolism / Q000601:surgery*; D008422:Materials Testing; D010024:Osteoporosis / Q000150:complications / Q000378:metabolism* / Q000473:pathology; D011817:Rabbits; D013324:Strontium / Q000737:chemistry*
chemical_list: D013324:Strontium
keywords: bioabsorbable; fixation; fracture; osteoporosis; strontium