Publications by authors named "M Bonyun"

5 Publications

  • Page 1 of 1

Outcomes of distal femoral arthroplasty after periprosthetic fractures : minimum 2-year follow-up.

Acta Orthop Belg 2021 Mar;87(1):111-116

Purpose: distal femoral periprosthetic fracture (DFPPF) is a serious complication following total knee arthroplasty (TKA). Recently, treatment of DFPPF with distal femoral arthroplasty (DFA) has gained popularity because of its posited benefits for both patients and the medical system. Short-term follow-up trials investigating DFA have demonstrated acceptable results with regards to function, pain relief and lower postoperative complications than ORIF in elderly patients. The purpose of the current study was to evaluate a consecutive series of DFPPF treated with DFA, with a minimum 2- year follow-up.

Methods: We performed a retrospective study asses- sing the outcomes of distal femoral arthroplasty (DFA) for patients diagnosed with DFPPF.

Results: Twenty patients were identified. The mean age of patients was 76.3 (SD, 9.41), the average time from the fracture to revision surgery was 6.7 days (SD, 11.35), The average operative time was 93.5 minutes (SD,16.6). The average follow-up time was 50.15 months (SD, 20.87). During this time, two patients (10%) had complications. One patient experienced a knee dislocation and the second patient had recurrent periprosthetic infections. At final follow up, the mean knee society score was 86.25 (SD, 9.44), the mean Forgotten joint score was 62.16(SD, 23.45) and 93.7 percent of patients were ambulatory.

Conclusion: DFA following DFPPF is associated with high success rates and provides patients with the opportunity for return of function in a safe and reliable manner.
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March 2021

Techniques for Reduction and Fixation of the Sternoclavicular Joint.

J Orthop Trauma 2020 08;34 Suppl 2:S1-S2

Division of Orthopaedic Surgery, University of Toronto, Chair in Fracture Care Research at St. Michael's Hospital, Toronto, ON, Canada.

This video demonstrates the relevant anatomy, approach, and surgical techniques for reduction and fixation of the sternoclavicular joint in both the acute and chronic settings. Fixation techniques demonstrated include transosseous suture fixation, figure-of-eight autograft/allograft fixation, and transarticular plating. A step-by-step guide is provided with demonstration video on cadaveric specimens for each technique, along with a case example that demonstrates acute reduction and fixation of a posterior sternoclavicular joint dislocation.
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August 2020

Hardware considerations in infection and nonunion management: When and how to revise the fixation.

OTA Int 2020 Mar 23;3(1):e055. Epub 2020 Mar 23.

Division of Orthopaedic Surgery, Department of Surgery, University of Toronto.

The occurrence of both nonunion and fracture-related infection provides challenges for both the patient and the treating orthopaedic surgeon, with the potential need for complex reconstructive procedures to achieve union and/or eradicate infection. In addition to addressing the multiple different factors that often contribute to nonunion, surgeons are often forced to deal with difficult hardware issues at the time of revision surgery including infected hardware, loose or failing hardware, malaligned hardware, or inappropriate hardware constructs. This article reviews common causes of nonunions with emphasis on infection management and provides indications and techniques for hardware removal in the context of an algorithmic approach to nonunion management with illustrative case examples.
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March 2020

Hot topics in biomechanically directed fracture fixation.

J Orthop Trauma 2014 ;28 Suppl 1:S32-5

*Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada; †Division of Orthopaedic Surgery, University of Toronto, Toronto, Ontario, Canada; ‡Department of Orthopaedic Surgery, Hospital for Joint Diseases, NYU Langone Medical Center, New York, NY; §Department of Orthopaedics, Washington University School of Medicine, St Louis, MO; ‖The Hughston Clinic, Columbus, GA; and ¶Department of Orthopaedic Surgery, University of California, Davis School of Medicine, Sacramento, CA.

The evolution of locking plates and modern nail constructs provides the orthopaedic trauma surgeon with a myriad of options with regard to implant selection for common fractures. There is a significant amount of biomechanical literature comparing modern constructs with those conventionally used. A basic understanding of this literature is required to make informed decisions with regard to implant selection in the management of these injuries. This article reviews the most recent biomechanical literature regarding implant selection and application for a variety of commonly treated injuries, including fractures of the clavicle, proximal humerus, distal humerus, intertrochanteric hip region, distal femur, and bicondylar tibial plateau.
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September 2014

Helmet use in BIXI cyclists in Toronto, Canada: an observational study.

BMJ Open 2012 18;2(3). Epub 2012 Jun 18.

Faculty of Medicine, University of Toronto, Toronto, Canada.

Objective: To investigate the use of helmets for cyclists choosing to use BIXI bikes in comparison to personal bike riders in the City of Toronto.

Design: Cross-sectional study design.

Setting: Cyclists were observed in Toronto, Canada.

Participants: Of the 6732 sample size, 306 cyclists on BIXI bikes and 6426 personal bike riders were observed.

Outcome Measure: The outcome of interest was helmet use.

Results: Overall, 50.3% of cyclists wore helmets. The proportion of BIXI bike riders using helmets was significantly lower than the proportion of helmet users on personal bikes (20.9% vs 51.7%, respectively, p<0.0001).

Conclusions: Although the BIXI bike programme has provided an alternate means for Torontonians to use a bicycle, cyclists using BIXI bikes are much less likely to wear a helmet. Since the prevalence of helmet use in cyclists in general is already low, helmet use should be especially promoted in BIXI bike riders in order to promote a safe and healthy environment for cyclists.
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October 2012