An inconspicuous stabilizer of the subtalar joint: MR arthrographic anatomy of the posterior talocalcaneal ligament
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SCIENTIFIC ARTICLE
An inconspicuous stabilizer of the subtalar joint: MR arthrographic anatomy of the posterior talocalcaneal ligament Bahar Cankaya 1
&
Hayri Ogul 1
Received: 6 July 2020 / Revised: 4 September 2020 / Accepted: 16 September 2020 # ISS 2020
Abstract Objective The main function of the posterior talocalcaneal ligament (PTL) is to stabilize the posterior subtalar joint in the ankle. PTL is a potential source of pain in chronic subtalar instability. Our knowledge of the anatomy and function of PTL is limited and there are not many studies regarding its morphology. The aim of this study is to provide detailed information about imaging anatomy and morphology of PTL. Materials and methods This retrospective study included 197 ankle images of 184 patients (13 bilateral) obtained from MR arthrography (MRA) and conventional MRI between 2012 and 2019. The incidence of PTL was evaluated using both methods. The location of the ligament to the calcaneus, shape, and intraarticular extension was determined by MRA. In addition, thickness and lengths were measured in millimeters, and the presence of os trigonum, contrast agent extravasation into adjacent anatomical structures, was evaluated. The upper surface of the calcaneus was divided into nine regions in the axial view and three regions in the sagittal view. Results The incidence of PTL was 65.5% (n = 129). In axial view, the most common calcaneal attachment was in the 5th zone. The ligament was mostly fan-shaped (n = 104) and the extraarticular course was 87%. The average length was 15.9 mm and the average thickness was 1.1 mm. There were os trigonum in 18 cases. Conclusion Having knowledge of the morphology and variations of PTL and defining its relationship with adjacent anatomical structures can help evaluate subtalar instability. Keywords Posterior talocalcaneal ligament . Anatomy . MR arthrography
Introduction Posterior talocalcaneal ligament (PTL) is a short, straight, quadrangular ligament that starts from the lateral surface and apex of the posterolateral talar tubercle and adheres to the superior and medial surface of the calcaneus [1]. PTL is one of the three extrinsic ligaments that provide the stabilization of the posterior subtalar joint. PTL is accepted as an indirect stabilizatior of the hindfoot during dorsiflexion and also contributes to the preservation of the plantar arch [2]. The subtalar
* Bahar Cankaya [email protected] Hayri Ogul [email protected] 1
Department of Radiology, Medical Faculty, Ataturk University, Erzurum, Turkey
joint is a rather complex structure, and it provides ankle inversion and eversion. It has been reported that PTL may be a potential source of pain in chronic subtalar instability [3]. In the case of inferior tibiofibular syndesmosis injury, the anterior talofibular ligament and PTL show more resistance than other ligaments during internal and external ankle rotation [4]. Liu et al., who investigated the biomechanical effects of inferior tibiofibular syndesmosis injuries on the ankle in the neutral positi
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