Reliability of the Clinical Tibiofibular Line Technique for Open Syndesmosis Reduction Assessment
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1 Reliability of the Clinical Tibiofibular Line Technique for Open Syndesmosis Reduction Assessment Christopher W. Reb, DO Daniel C. Herman, MD, PhD Gregory C. Berlet, MD
2 Christopher W. Reb, DO Reliability of the Clinical Tibiofibular Line Technique for Open Syndesmosis Reduction Assessment Our disclosures are in the Final AOFAS Mobile App. There is a potential conflict with this presentation due to: Consultant, Wright Medical Technologies, Inc. (GCB); Research Grant, DJO Global (GCB)
3 Introduction When intraoperative CT is unavailable, open syndesmosis assessment is a universally available safe alternative that is more accurate than radiographic assessment. However, it has a documented malreduction rate of up to 16%. This may be improved by a validated technique for assessing the accuracy of the open syndesmosis reduction. No such technique currently exists.
4 Purpose The tibiofibular line (TFL) was described as a tangential line between the flat anterolateral surface of the distal fibula and the anterolateral tubercle of the distal tibia as viewed on ankle axial CT images 10 millimeters (mm) above the plafond (Fig 1a). The purpose of this study was to assess the feasibility of adapting the CT-based TFL method into a reliable intraoperative open technique.
5 Methods This was an IRB-exempt study utilizing 10 cadaveric lower limbs. Three observers were instructed to clinically simulate the TFL by using two surgical rulers. The axial plane was marked 10 mm above the tibial plafond (Fig. b-c). The first ruler was held tangent to the flat anterolateral surface of the fibula (Fig. d). Then, it was advanced anteromedially until it either contacted or overhung the anterior tibial tubercle (Fig. e). A second ruler was used to measure the narrowest distance between the first ruler and anterior tibial tubercle (Fig. f).
6 Methods Sagittal plane fibula displacement randomized to 0, +/- 2.5mm, or +/- 5mm per measurement series. Four measurement series conducted. Three observers repeated measurements 3 times per series. Total of 1080 clinical TFL measurements obtained.
7 Intraclass Correlation Coefficients Results Intraobserver and Interobserver Reliability Observer 1 Observer 2 Observer 3 All Observers Series Series Series Series Legend: Excellent Good Mean intraobserver reliability was 0.88 (range, 0.72 to 0.98). Mean interobserver reliability was 0.75 (range, 0.68 to 0.93).
8 Results Observer Reliability by Fibula Displacement Magnitude Intraclass Correlation Coefficients 0mm +/-' 2.5mm +/-' 5mm Observer Observer Observer All Observers Legend: Excellent Good Observer reliability was highest for 0mm displacement and generally lower with greater fibula displacement magnitudes.
9 Discussion Intraoperative computed tomography is the gold standard for syndesmosis reduction assessment but its availability is limited due to feasibility and cost constraints. The importance of the current study is the concept of translating the objectivity of a CT-based technique into the otherwise highly subjective open technique.
10 Discussion The present study demonstrated excellent to near perfect intraobserver and good to excellent interobserver reliability for the clinical tibiofibular line technique. Although severely limited by the lack of the CT TFL measurements needed to assess the accuracy of clinical TFL measurements, it appears that future work is merited to address this
11 References 1. Gardner MJ, Demetrakopoulos D, Briggs SM, Helfet DL, Lorich DG. Malreduction of the tibiofibular syndesmosis in ankle fractures. Foot Ankle Int. 2006;27(10): Miller AN, Carroll EA, Parker RJ, Boraiah S, Helfet DL, Lorich DG. Direct visualization for syndesmotic stabilization of ankle fractures. Foot Ankle Int. 2009;30(5): Sagi HC, Shah AR, Sanders RW. The functional consequence of syndesmotic joint malreduction at a minimum 2-year follow-up. J Orthop Trauma. 2012;26(7): Rasi AM, Kazemian G, Omidian MM, Nemati A. Syndesmotic Malreduction after Ankle ORIF; Is Radiography Sufficient?. Arch Bone Jt Surg. 2013;1(2): Davidovitch RI, Weil Y, Karia R, Forman J, Looze C, Liebergall M, Egol K. Intraoperative syndesmotic reduction: three-dimensional versus standard fluoroscopic imaging. J Bone Joint Surg Am. 2013;95(20): Harper MC, Keller TS. A radiographic evaluation of the tibiofibular syndesmosis. Foot Ankle. 1989;10(3): Pneumaticos, SG; Noble, PC; Chatziioannou, SN; Trevino, SG: The effects of rotation on radiographic evaluation of the tibiofibular syndesmosis. Foot Ankle Int. 23: , Beumer A, van HemertWL, Niesing R, Entius CA, Ginai AZ, Mulder PG, Swierstra BA. Radiographic measurement of the distal tibiofibular syndesmosis has limited use. Clin. Orthop , Marmor M, Hansen E, Han HK, Buckley J, Matityahu A. Limitations of standard fluoroscopy in detecting rotational malreduction of the syndesmosis in an ankle fracture model. Foot Ankle Int. 2011;32(6): Yang Y, Zhou J, Li B, Zhao H, Yu T, Yu G. Operative exploration and reduction of syndesmosis in Weber type C ankle injury. Acta Ortop Bras. 2013;21(2): Gifford PB, Lutz M. The tibiofibular line: an anatomical feature to diagnose syndesmosis malposition. Foot Ankle Int. 2014;35(11): Koenig SJ, Tornetta P, Merlin G, et al. Can We Tell if the Syndesmosis Is Reduced Using Fluoroscopy? J Orthop Trauma. 2015;29(9):e Croft S, Furey A, Stone C, Moores C, Wilson R. Radiographic evaluation of the ankle syndesmosis. Can J Surg. 2015;58(1): Summers HD, Sinclair MK, Stover MD. A reliable method for intraoperative evaluation of syndesmotic reduction. J Orthop Trauma. 2013;27(4):
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