title: Combination of anorganic bovine-derived hydroxyapatite with binding peptide does not enhance bone healing in a critical-size defect in a rabbit model.
abstract: Anorganic bovine-derived hydroxyapatite (ABM) in combination with binding peptid (P-15) has demonstrated the capacity to improve the healing of periodontal defects. This study evaluated the benefit of ABM/P-15 to promote healing of cortical long bone defects in a rabbit model. A 5-mm segmental bone defect was created in the femur and fixed with a plate. There were two treatment groups: no implant (n = 12) and ABM/P-15 (n = 12). At 4, 8, and 12 weeks, healing of the defect was evaluated with radiographs and histomorphometric examination of the treated femora. After 4 weeks, radiographs showed bone formation without signs of complete consolidation in three of four animals in the control group and two of four ABM/P-15 treated animals. At the later course of the treatment, no radiologic difference was evident between the treatment groups. Histomorphometric evaluation revealed an area of 1.29 +/- 0.11 mm(2) and 0.97 +/- 0.21 mm(2) of newly produced bone in animals of the control group and ABM/P-15 group after 4 weeks. After 8 and 12 weeks, animals in the control group had an area of 2.44 +/- 0.62 mm(2) and 2.5 +/- 0.2 mm(2) of newly produced bone within the osteotomy gap compared to 1.6 +/- 0.65 mm(2) and 1.56 +/- 0.27 mm(2) in the ABM/P-15 group (p = 0.0004). An enhanced or accelerated ingrowth of bone, as reported in previous studies, was not observed. Our results imply that the ABM/P-15 is not a suitable graft for the treatment of critical-sized segmental defects in long bones.
authors.affiliation: Department of Traumatology, Medical University of Vienna, Vienna, Austria.
authors.forename: Kambiz
authors.initials: K
authors.lastname: Sarahrudi
authors.forename: Mehdi
authors.initials: M
authors.lastname: Mousavi
authors.forename: Karl
authors.initials: K
authors.lastname: Grossschmidt
authors.forename: Nezir
authors.initials: N
authors.lastname: Sela
authors.forename: Franz
authors.initials: F
authors.lastname: König
authors.forename: Vilmos
authors.initials: V
authors.lastname: Vécsei
authors.forename: Seyedhossein
authors.initials: S
authors.lastname: Aharinejad
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000494:pharmacology*; D001860:Bone Plates; D002417:Cattle; D003094:Collagen / Q000494:pharmacology*; D003131:Combined Modality Therapy; D004195:Disease Models, Animal; D004359:Drug Therapy, Combination; D017886:Durapatite / Q000494:pharmacology*; D005260:Female; D005264:Femoral Fractures / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000601:surgery*; D010027:Osteotomy; D010446:Peptide Fragments / Q000494:pharmacology*; D011475:Prosthesis Failure; D011817:Rabbits; D011859:Radiography
chemical_list: D001672:Biocompatible Materials; D010446:Peptide Fragments; C407062:cell-binding peptide P-15; D003094:Collagen; D017886:Durapatite