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Berk T, Zderic I, Varga P, Schwarzenberg P, Berk K, Grüneweller N, Pastor T, Halvachizadeh S, Richards G, Gueorguiev B, Pape HC. Substitutional semi-rigid osteosynthesis technique for treatment of unstable pubic symphysis injuries: a biomechanical study. Eur J Trauma Emerg Surg 2023; 49:2569-2578. [PMID: 37555991 PMCID: PMC10728235 DOI: 10.1007/s00068-023-02333-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 07/15/2023] [Indexed: 08/10/2023]
Abstract
BACKGROUND/PURPOSE The surgical fixation of a symphyseal diastasis in partially or fully unstable pelvic ring injuries is an important element when stabilizing the anterior pelvic ring. Currently, open reduction and internal fixation (ORIF) by means of plating represents the gold standard treatment. Advances in percutaneous fixation techniques have shown improvements in blood loss, surgery time, and scar length. Therefore, this approach should also be adopted for treatment of symphyseal injuries. The technique could be important since failure rates, following ORIF at the symphysis, remain unacceptably high. The aim of this biomechanical study was to assess a semi-rigid fixation technique for treatment of such anterior pelvic ring injuries versus current gold standards of plate osteosynthesis. METHODS An anterior pelvic ring injury type III APC according to the Young and Burgess classification was simulated in eighteen composite pelvises, assigned to three groups (n = 6) for fixation with either a single plate, two orthogonally positioned plates, or the semi-rigid technique using an endobutton suture implant. Biomechanical testing was performed in a simulated upright standing position under progressively increasing cyclic loading at 2 Hz until failure or over 150,000 cycles. Relative movements between the bone segments were captured by motion tracking. RESULTS Initial quasi-static and dynamic stiffness, as well as dynamic stiffness after 100,000 cycles, was not significantly different among the fixation techniques (p ≥ 0.054).). The outcome measures for total displacement after 20,000, 40,000, 60,000, 80,000, and 100,000 cycles were associated with significantly higher values for the suture technique versus double plating (p = 0.025), without further significant differences among the techniques (p ≥ 0.349). Number of cycles to failure and load at failure were highest for double plating (150,000 ± 0/100.0 ± 0.0 N), followed by single plating (132,282 ± 20,465/91.1 ± 10.2 N), and the suture technique (116,088 ± 12,169/83.0 ± 6.1 N), with significantly lower values in the latter compared to the former (p = 0.002) and no further significant differences among the techniques (p ≥ 0.329). CONCLUSION From a biomechanical perspective, the semi-rigid technique for fixation of unstable pubic symphysis injuries demonstrated promising results with moderate to inferior behaviour compared to standard plating techniques regarding stiffness, cycles to failure and load at failure. This knowledge could lay the foundation for realization of further studies with larger sample sizes, focusing on the stabilization of the anterior pelvic ring.
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Affiliation(s)
- Till Berk
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland.
- Department of Trauma, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland.
| | - Ivan Zderic
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Peter Varga
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | | | - Karlyn Berk
- Harald-Tscherne Laboratory for Orthopedic and Trauma Research, University of Zurich, Sternwartstrasse 14, 8091, Zurich, Switzerland
| | - Niklas Grüneweller
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
- Department of Trauma Surgery and Orthopedics, Protestant Hospital of Bethel Foundation, University Hospital OWL of Bielefeld University, Campus Bielefeld‑Bethel, Burgsteig 13, 33617, Bielefeld, Germany
| | - Tatjana Pastor
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
- Department of Plastic and Hand Surgery, Inselspital University Hospital Bern, University of Bern, Freiburgstrasse 15, 3010, Bern, Switzerland
| | - Sascha Halvachizadeh
- Department of Trauma, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
- Harald-Tscherne Laboratory for Orthopedic and Trauma Research, University of Zurich, Sternwartstrasse 14, 8091, Zurich, Switzerland
| | - Geoff Richards
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Boyko Gueorguiev
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Hans-Christoph Pape
- Department of Trauma, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
- Harald-Tscherne Laboratory for Orthopedic and Trauma Research, University of Zurich, Sternwartstrasse 14, 8091, Zurich, Switzerland
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Tape suture constructs for instabilities of the pubic symphysis: is the idea of motion preservation a suitable treatment option? A cadaver study. Arch Orthop Trauma Surg 2022; 143:3111-3117. [PMID: 35831608 DOI: 10.1007/s00402-022-04547-6] [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: 04/05/2022] [Accepted: 07/03/2022] [Indexed: 11/02/2022]
Abstract
INTRODUCTION Current gold standard for the treatment of symphyseal disruptions includes anterior plating, almost entirely prohibiting symphyseal mobility and resulting in an iatrogenic arthrodesis followed by high rates of implant failure. Minimally invasive tape suture constructs have been found to maintain the micro mobility of ligamentous injuries, yet still providing sufficient biomechanical stability. Recently, this technique has been primarily investigated for symphyseal disruptions on synthetic pelvic models. Therefore, the aim of this study was to examine the feasibility of this novel flexible osteosynthesis on cadaveric pelvic models based on the following hypothesis: tape suture constructs ensure sufficient biomechanical stability without inhibiting micro mobility of the pubic symphysis for the treatment of symphyseal disruptions and maintain stability during long-term loading. MATERIALS AND METHODS 9 cadaveric anterior pelvic rings were used in this study and a symphyseal disruption was created in every specimen. The specimens were then exposed to short- and long-term vertical and horizontal cyclic loading after treatment with a tape suture construct in criss-cross technique. The mean maximum displacement (mm) during cyclic loading and the corresponding stiffness (N/mm) were measured and compared. RESULTS Regarding both displacement (mm) and corresponding stiffness (N/mm), the tape sutures displayed a significant difference between short- and long-term loading for cranial and caudal vertical loading (p < 0.01) but differences remained non-significant for horizontal loading (p > 0.05). No tape suture suffered from implant failure during long-term loading. CONCLUSIONS The tape suture construct displayed sufficient biomechanical stability without exceeding the physiological mobility of 2 mm of the pubic symphysis; however, also maintained the desired micro mobility of the affected joint necessary to prevent an iatrogenic arthrodesis. Further, all tape sutures maintained stability throughout long-term loading.
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Cavalcanti Kußmaul A, Schwaabe F, Kistler M, Gennen C, Andreß S, Becker CA, Böcker W, Greiner A. Novel minimally invasive tape suture osteosynthesis for instabilities of the pubic symphysis: a biomechanical study. Arch Orthop Trauma Surg 2022; 142:2235-2243. [PMID: 34052913 PMCID: PMC9381629 DOI: 10.1007/s00402-021-03968-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Accepted: 05/18/2021] [Indexed: 01/13/2023]
Abstract
INTRODUCTION Open book fractures are challenging injuries oftentimes requiring surgical treatment. The current treatment of choice is symphyseal plating, which requires extensive surgery and entirely limits physiological movement of the symphyseal joint, frequently resulting in implant failure. Therefore, we investigated the biomechanical properties of a semi-rigid implant (modified SpeedBridge™) as a minimally invasive tape suture construct for the treatment of open book fractures and evaluated the superiority of two techniques of implementation: criss-cross vs. triangle technique. MATERIALS AND METHODS Nine synthetic symphyseal joints were dissected creating an open book fracture. The different osteosynthesis methods (plating, modified SpeedBridge™ in criss-cross/triangle technique) were then applied. All constructs underwent horizontal and vertical loading, simulating biomechanical forces while sitting, standing and walking. For statistical analysis, dislocation (mm) and stiffness (N/mm) were calculated. RESULTS Symphyseal plating for the treatment of open book fractures proved to be a rigid osteosynthesis significantly limiting the physiological mobility of the symphyseal joint (dislocation: 0.08 ± 0.01 mm) compared to the tape sutures (dislocation: triangle technique 0.27 ± 0.07 mm, criss-cross technique 0.23 ± 0.05 mm) regarding horizontal tension (p < 0.01). Both modified SpeedBridge™ techniques showed sufficient biomechanical stability without one being superior to the other (p > 0.05 in all directions). Considering vertical loading, no statistical difference was found between all osteosynthesis methods (caudal: p = 0.41; cranial: p = 0.61). CONCLUSIONS Symphyseal plating proved to be the osteosynthesis method with the highest rigidity. The modified SpeedBridge™ as a semi-rigid suture construct provided statistically sufficient biomechanical stability while maintaining a minimum of symphyseal movement, consequently allowing ligamental healing of the injured joint without iatrogenic arthrodesis. Furthermore, both the criss-cross and the triangle technique displayed significant biomechanical stability without one method being superior.
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Affiliation(s)
- Adrian Cavalcanti Kußmaul
- grid.411095.80000 0004 0477 2585Department of General Trauma and Reconstructive Surgery, University Hospital LMU Munich, Munich, Germany
| | - Fanny Schwaabe
- grid.411095.80000 0004 0477 2585Department of General Trauma and Reconstructive Surgery, University Hospital LMU Munich, Munich, Germany
| | - Manuel Kistler
- grid.411095.80000 0004 0477 2585Department of Orthopedics, Physical Medicine and Rehabilitation, University Hospital LMU Munich, Munich, Germany
| | - Clara Gennen
- grid.411095.80000 0004 0477 2585Department of Obstetrics and Gynecology, University Hospital LMU Munich, Munich, Germany
| | - Sebastian Andreß
- grid.411095.80000 0004 0477 2585Department of General Trauma and Reconstructive Surgery, University Hospital LMU Munich, Munich, Germany
| | - Christopher A. Becker
- grid.411095.80000 0004 0477 2585Department of General Trauma and Reconstructive Surgery, University Hospital LMU Munich, Munich, Germany
| | - Wolfgang Böcker
- grid.411095.80000 0004 0477 2585Department of General Trauma and Reconstructive Surgery, University Hospital LMU Munich, Munich, Germany
| | - Axel Greiner
- grid.411095.80000 0004 0477 2585Department of General Trauma and Reconstructive Surgery, University Hospital LMU Munich, Munich, Germany
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