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Sun H, Godbout C, Ryan G, Hoit G, Higgins J, Schemitsch EH, Nauth A. The induced membrane technique: Optimization of bone grafting in a rat model of segmental bone defect. Injury 2022; 53:1848-1853. [PMID: 35341595 DOI: 10.1016/j.injury.2022.03.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 03/10/2022] [Indexed: 02/02/2023]
Abstract
INTRODUCTION The induced membrane technique (IMT) is a two-stage surgical procedure used to treat fracture nonunion and bone defects. Although there is an increasing number of animal studies investigating the IMT, few have examined the outcomes of bone healing after a second stage grafting procedure. This study aimed at comparing two bone grafting procedures, as part of the IMT, in order to establish a rat model providing consistent healing outcomes. METHODS In male Fischer 344 rats, we created a 5 mm defect in the right femur, stabilized the bone with a plate and screws, and inserted a polymethylmethacrylate spacer into the defect. Four weeks later, the spacer was removed. Bone graft was harvested from a donor rat and placed into the defect, followed by membrane and wound closure. Experiments were conducted in two groups. In group 1 (n = 11), the bone graft contained a variable amount of cortical and cancellous bone, the time from donor euthanasia to grafting was up to 240 min, and one donor rat provided graft for 5-6 recipients. In group 2 (n = 12), we reduced the contribution of cortical bone to the graft, included bone marrow, and kept donor euthanasia to grafting time under 150 min. One donor was used per 3-4 recipients. The volume of graft per recipient and all other elements of the protocol were the same across groups. Bone healing at 12 weeks post grafting was compared radiographically by two orthopaedic surgeons in a blinded fashion, based on union status and a modified Lane & Sandhu score. RESULTS Healing rates improved from 36.4% in Group 1 to 91.6% in Group 2. There was a significant relationship between the methods and resulting union status (p = 0.004). The odds of achieving full union were significantly higher in group 2 compared to group 1 (odds ratio=19.25, 95% confidence interval [1.77-209.55]; p = 0.009). The average radiographic score was also significantly higher in group 2 (p = 0.005). CONCLUSION The revised bone grafting method significantly improved the healing outcomes and contributed to establishing a consistent rat model of the IMT. This model can benefit preclinical investigations by allowing for reliable and clinically-relevant comparisons.
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Affiliation(s)
- Hening Sun
- Division of Orthopaedic Surgery, St. Michael's Hospital, 55 Queen Street East, Suite 800, Toronto, ON M5C 1R6, Canada; Faculty of Medicine, University of Toronto, Toronto, Canada
| | - Charles Godbout
- Division of Orthopaedic Surgery, St. Michael's Hospital, 55 Queen Street East, Suite 800, Toronto, ON M5C 1R6, Canada
| | - Gareth Ryan
- Division of Orthopaedic Surgery, St. Michael's Hospital, 55 Queen Street East, Suite 800, Toronto, ON M5C 1R6, Canada; Faculty of Medicine, University of Toronto, Toronto, Canada
| | - Graeme Hoit
- Division of Orthopaedic Surgery, St. Michael's Hospital, 55 Queen Street East, Suite 800, Toronto, ON M5C 1R6, Canada; Faculty of Medicine, University of Toronto, Toronto, Canada
| | - James Higgins
- Division of Orthopaedic Surgery, St. Michael's Hospital, 55 Queen Street East, Suite 800, Toronto, ON M5C 1R6, Canada; Faculty of Medicine, University of Toronto, Toronto, Canada
| | | | - Aaron Nauth
- Division of Orthopaedic Surgery, St. Michael's Hospital, 55 Queen Street East, Suite 800, Toronto, ON M5C 1R6, Canada; Faculty of Medicine, University of Toronto, Toronto, Canada.
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Sun Q, Li Z, Liu B, Yuan X, Guo S, Helms JA. Improving intraoperative storage conditions for autologous bone grafts: An experimental investigation in mice. J Tissue Eng Regen Med 2019; 13:2169-2180. [PMID: 31617958 DOI: 10.1002/term.2970] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 08/27/2019] [Accepted: 09/26/2019] [Indexed: 11/07/2022]
Affiliation(s)
- Qiang Sun
- Department of Plastic SurgeryThe First Hospital of China Medical University Shenyang China
- Division of Plastic and Reconstructive Surgery, Department of SurgeryStanford School of Medicine Stanford CA
| | - Zhijun Li
- Division of Plastic and Reconstructive Surgery, Department of SurgeryStanford School of Medicine Stanford CA
- Department of OrthopedicsTianjin Medical University General Hospital Tianjin China
| | - Bo Liu
- Ankasa Regenerative Therapeutics, Inc. South San Francisco CA
| | - Xue Yuan
- Division of Plastic and Reconstructive Surgery, Department of SurgeryStanford School of Medicine Stanford CA
| | - Shu Guo
- Department of Plastic SurgeryThe First Hospital of China Medical University Shenyang China
| | - Jill A. Helms
- Division of Plastic and Reconstructive Surgery, Department of SurgeryStanford School of Medicine Stanford CA
- Ankasa Regenerative Therapeutics, Inc. South San Francisco CA
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