A bioactive synthetic membrane improves bone healing in a preclinical nonunion model.

Journal Article (Journal Article)

OBJECTIVES: High energy long bone fractures with critical bone loss are at risk for nonunion without strategic intervention. We hypothesize that a synthetic membrane implanted at a single stage improves bone healing in a preclinical nonunion model. METHODS: Using standard laboratory techniques, microspheres encapsulating bone morphogenic protein-2 (BMP2) or platelet derived growth factor (PDGF) were designed and coupled to a type 1 collagen sheet. Critical femoral defects were created in rats and stabilized by locked retrograde intramedullary nailing. The negative control group had an empty defect. The induced membrane group (positive control) had a polymethylmethacrylate spacer inserted into the defect for four weeks and replaced with a bare polycaprolactone/beta-tricalcium phosphate (PCL/β-TCP) scaffold at a second stage. For the experimental groups, a bioactive synthetic membrane embedded with BMP2, PDGF or both enveloped a PCL/β-TCP scaffold was implanted in a single stage. Serial radiographs were taken at 1, 4, 8, and 12 weeks postoperatively from the definitive procedure and evaluated by two blinded observers using a previously described scoring system to judge union as primary outcome. RESULTS: All experimental groups demonstrated better union than the negative control (p = 0.01). The groups with BMP2 incorporated into the membrane demonstrated higher average union scores than the other groups (p = 0.01). The induced membrane group performed similarly to the PDGF group. Complete union was only demonstrated in groups with BMP2-eluting membranes. CONCLUSIONS: A synthetic membrane comprised of type 1 collagen embedded with controlled release BMP2 improved union of critical bone defects in a preclinical nonunion model.

Full Text

Duke Authors

Cited Authors

  • DeBaun, MR; Salazar, BP; Bai, Y; Gardner, MJ; Yang, YP; Stanford iTEAM group, ; Pan, C-C; Stahl, AM; Moeinzadeh, S; Kim, S; Lui, E; Kim, C; Lin, S; Goodnough, LH; Wadhwa, H

Published Date

  • April 2022

Published In

Volume / Issue

  • 53 / 4

Start / End Page

  • 1368 - 1374

PubMed ID

  • 35078617

Pubmed Central ID

  • PMC8940692

Electronic International Standard Serial Number (EISSN)

  • 1879-0267

Digital Object Identifier (DOI)

  • 10.1016/j.injury.2022.01.015


  • eng

Conference Location

  • Netherlands