Morshed S, Bhandari M: Clinical trial design in fracture-healing research: meeting the challenge. J Bone Joint Surg Am 90(suppl 1): 55, 2008.
Donken CC, Al-Khateeb H, Verhofstad MH, et al: Surgical versus conservative interventions for treating ankle fractures in adults. Cochrane Database Syst Rev 8: CD008470, 2012.
Wei SY, Okereke E, Winiarsky R, et al: Nonoperatively treated displaced bimalleolar and trimalleolar fractures: a 20-year follow-up. Foot Ankle Int 20: 404, 1999.
Kerkhoffs GM, Rowe BH, Assendelft WJ, et al: Immobilisation for acute ankle sprain: a systematic review. Arch Orthop Trauma Surg 121: 462, 2001.
Chu A, Weiner L: Distal fibula malunions. J Am Acad Orthop Surg 17: 220, 2009.
Dabash S, Elabd A, Potter E, et al: Adding deltoid ligament repair in ankle fracture treatment: is it necessary? a systematic review. Foot Ankle Surg 25: 714, 2019.
Kellam PJ, Dekeyser GJ, Haller JM, et al: Predicting syndesmotic injury in OTA/AO 44-B2.1 (Danis-Weber B) fractures. J Orthop Trauma 35: 473, 2021.
Dhillon MS, Rajnish RK, Patel S, et al: Osteoporotic ankle fractures: a narrative review of management options. J Clin Orthop Trauma 11: 380, 2020.
Ramos LS, Gonçalves HM, Freitas A, et al: Evaluation of the reproducibility of Lauge-Hansen, Danis-Weber, and AO classifications for ankle fractures. Rev Bras Ortop 56: 372, 2021.
Müller ME, Nazarian S, Koch P, et al: The Comprehensive Classification of Fractures of Long Bones, Springer Science & Business Media, Berlin, 2012.
Rammelt S, Manke E: Syndesmosis injuries at the ankle [in German]. Unfallchirurg 121: 693, 2018.
Bastias GF, Filippi J: Acute deltoid ligament repair in ankle fractures. Foot Ankle Clin 25: 597, 2020.
Pakarinen HJ, Flinkkilä TE, Ohtonen PP, et al: Anterior inferior tibiofibular ligament exploration and repair in Weber B-type ankle fracture: a comparative retrospective study. Eur J Orthop Surg Traumatol 21: 593, 2011.
Faqi MK, AlJawder A, Alkhalifa F, et al: Weber B fracture of the lateral malleolus with concomitant anterior talofibular ligament injury following an ankle supination injury. Case Rep Orthop 2016: 8035029, 2016.
Zhou L, Lin Y, Zhai X, et al: Finite element analysis of the influence of anterior talofibular ligament injury on Hook test results. Injury 48: 1499, 2017.
Zhou L, Lin J, Wang B, et al: Biomechanical effect of anterior talofibular ligament injury in Weber B lateral malleolus fractures after lateral plate fixation: a finite element analysis. Foot Ankle Surg 26: 871, 2020.
Xia S, Zhang Y, Wang X, et al: Computerized virtual surgery planning for ORIF of proximal humeral fractures. Orthopedics 38: e428, 2015.
Öner K, Durusoy S, Özer A: Is the fracture morphology in the sagittal plane important in determining the ideal placement of the lag screw in intertrochanteric femoral fractures? ideal lag screw placement in intertrochanteric fractures in the sagittal plane. Injury 52: 562, 2021.
Li J, Wei Y, Wei M: Finite element analysis of the effect of talar osteochondral defects of different depths on ankle joint stability. Med Sci Monit 26: e921823, 2020.
Zhao Z, Yan T, Guo W, et al: Is double-strut fibula ankle arthrodesis a reliable reconstruction for bone defect after distal tibia tumor resection? a finite element study based on promising clinical outcomes. J Orthop Surg Res 16: 230, 2021.
Doty JF, Dunlap BD, Panchbhavi VK, et al: Deltoid ligament injuries associated with ankle fractures: arguments for and against direct repair. J Am Acad Orthop Surg 29: e388, 2021.
Richter J, Schulze W, Clasbrummel B, et al: The role of the tibiofibular syndesmotic and the deltoid ligaments in stabilizing Weber B type ankle joint fractures: an experimental investigation [in German]. Unfallchirurg 106: 359, 2003.
Hintermann B, Knupp M, Pagenstert GI: Deltoid ligament injuries: diagnosis and management. Foot Ankle Clin 11: 625, 2006.
Malakoutikhah H, Latt LD: Disease-specific finite element analysis of the foot and ankle. Foot Ankle Clin 28: 155, 2023.
Kim JW, Oh CW, Kim BS, et al: Structure-mechanical analysis of various fixation constructs for basicervical fractures of the proximal femur and clinical implications; finite element analysis. Injury 54: 370, 2023.
Behforootan S, Chatzistergos P, Naemi R, et al: Finite element modelling of the foot for clinical application: a systematic review. Med Eng Phys 39: 1, 2017.
Fushimi K, Miyagawa T, Iwai C, et al: Transforaminal lumbar interbody fusion with double banana cages: clinical evaluations and finite element model analysis. Global Spine J [March 21, 2023].
Huang G, Chen K, Wang Y, et al: Finite element analysis of the Union Plate in treating elderly acetabular fracture patients. J Orthop Surg Res 17: 56, 2022.
Wierer G, Winkler PW, Pomwenger W, et al: Transpatellar bone tunnels perforating the lateral or anterior cortex increase the risk of patellar fracture in MPFL reconstruction: a finite element analysis and survey of the International Patellofemoral Study Group. Knee Surg Sports Traumatol Arthrosc 30: 1620, 2022.
Yano S, Matsuura Y, Hagiwara S, et al: Determinants of fracture type in the proximal femur: biomechanical study of fresh frozen cadavers and finite element models. Bone 158: 116352, 2022.
Lee S, Lin J, Hamid KS, et al: Deltoid ligament rupture in ankle fracture: diagnosis and management. J Am Acad Orthop Surg 27: e648, 2019.
Gougoulias N, Sakellariou A: When is a simple fracture of the lateral malleolus not so simple? how to assess stability, which ones to fix and the role of the deltoid ligament. Bone Joint J 99-B: 851, 2017.
Lampridis V, Gougoulias N, Sakellariou A: Stability in ankle fractures: diagnosis and treatment. EFORT Open Rev 3: 294, 2018.
Bejarano-Pineda L, Guss D, Waryasz G, et al: The syndesmosis: part I. Anatomy, injury mechanism, classification, and diagnosis. Orthop Clin North Am 52: 403, 2021.
Hermans JJ, Beumer A, de Jong TA, et al: Anatomy of the distal tibiofibular syndesmosis in adults: a pictorial essay with a multimodality approach. J Anat 217: 633, 2010.
Kortekangas T, Flinkkilä T, Niinimäki J, et al: Effect of syndesmosis injury in SER IV (Weber B)-type ankle fractures on function and incidence of osteoarthritis. Foot Ankle Int 36: 180, 2015.
Kohake MBJ, Wiebking U, O’Loughlin , et al: Mid-to long-term outcomes after Weber B-type ankle fractures with and without syndesmotic rupture. In vivo 33: 255, 2019.
Michelson J, Solocoff D, Waldman B, et al: Ankle fractures: the Lauge-Hansen classification revisited. Clin Orthop Relat Res (345): 198, 1997.
Gardner MJ, Demetrakopoulos D, Briggs SM, et al: The ability of the Lauge-Hansen classification to predict ligament injury and mechanism in ankle fractures: an MRI study. J Orthop Trauma 20: 267, 2006.
Egol KA, Amirtharajah M, Tejwani NC, et al: Ankle stress test for predicting the need for surgical fixation of isolated fibular fractures. J Bone Joint Surg Am 86: 2393, 2004.
Broos PL, Bisschop AP: Operative treatment of ankle fractures in adults: correlation between types of fracture and final results. Injury 22: 403, 1991.
Background: Distal fibula fractures at the ankle level are common and are usually accompanied by ligament injuries. This study aims to evaluate the effects of ankle ligament ruptures on ankle joints, fracture instability, and plate stress after distal fibula fracture fixed with a plate created by finite element analysis modeling and loading applied to ligament rupture models that may accompany this fracture.
Methods: A finite element model consisting of three-dimensional fibula, tibia, foot bones, and ankle ligaments was designed to investigate the effects of ligament injuries accompanying plate-detected AO type 44B2.1 fractures on fracture detection, fixation material, and ankle joints. Then, the results were evaluated by modeling ligament rupture in six different ways.
Results: In the modeling where the deltoid and talofibular ligaments are broken together, instability is highest in the ankle (2.31 mm) and fracture line (0.15 mm). The rupture of the anterior and posterior tibiofibular ligaments associated with syndesmosis caused less instability in the fracture and ankle than the single-ligament rupture models of both the deltoid and talofibular ligaments.
Conclusions: In the finite element modeling of AO type 44B2.1 fractures detected with plate, the importance and potential effects of often-overlooked ankle ligament injuries are pointed out. Note that when treating ankle injuries, the ankle should be treated as a whole, with both bone and soft tissue. In some cases, the fracture may represent the visible tip of the iceberg.