Bone formation effect of highly concentrated tricalcium phosphate biocomposite screws in a rabbit osteoporosis model. Issue 6 (14th September 2021)

• Record Type: Journal Article
• Authors: Jeong, Je Hoon; Jin, Eun‐Sun; Kim, Ji Yeon; Min, JoongKee; Jeon, Sang Ryong; Lee, Minsu; Choi, Kyoung Hyo
• Is Part Of: Journal of orthopaedic research. Volume 40:Issue 6(2022)
• Page Start: 1321
• Page End: 1328
• Publication Date: 2021-09-14
• Subjects: animal model -- biocomposite screw -- implant -- osteoporosis -- tricalcium phosphate; Orthopedics -- Periodicals; Musculoskeletal system -- Periodicals; 616.7
• DOI: 10.1002/jor.25171
• Languages: English
• ISSNs: 0736-0266

Abstract

Abstract: The purpose of this study was to determine the efficacy of highly concentrated tricalcium phosphate (TCP) biocomposite screws on local bone formation in a rabbit model of osteoporosis induced by bilateral ovariohysterectomy (OHE). Fourteen 24‐week‐old female New Zealand rabbits (weight, 3–3.5 kg) were divided into two groups: (1) OHE and biodegradable poly(lactic‐co‐glycolic acid) (PLGA) without ß–TCP plate or screw insertion (OHE/Bio ScRew [BSR]) group and (2) OHE and biocomposite PLGA with highly concentrated ß–TCP plate and screw insertion (OHE/highly concentrated ß–triCalcium phosphate [HCCP]). Both groups underwent bilateral OHE and had two different types of screws and plates inserted at the proximal tibia. Bilateral tibiae were extracted at 25 weeks post‐OHE. The extracted tibiae were scanned with ex vivo microcomputed tomography (micro‐CT). Parameters including bone mineral density (BMD), trabecular bone volume (BV/TV), trabecular number (Tb.N), trabecular thickness (Tb. Th), and trabecular separation (Tb. Sp) were evaluated after staining the tibial samples with hematoxylin and eosin (H&E) and Masson's trichrome. We then performed pathological assessments. Micro‐CT images revealed improved new bone formation near the implant in the OHE/HCCP group with higher values of BMD, BV/TV, and Tb.N but lower values of Tb. Th and Tb. Sp than the OHE/BSR group. Analyses of H&E and Masson's trichrome staining showed better new bone formation around the implant in the OHE/HCCP group than in the OHE/BSR group. The use of highly concentrated TCP biocomposite screw and plate might improve local bone formation and facilitate osteoconductivity in an osteoporotic rabbit model.