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Anatomical variations related to pathological conditions of the peroneal tendon: evaluation of ankle MRI with a 3D SPACE sequence in symptomatic patients

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Abstract

Objective

To evaluate anatomical variations in the lateral ankle and their relationships with pathological conditions of the peroneal tendon on magnetic resonance imaging (MRI) in symptomatic patients.

Materials and methods

Sixty-nine ankles MRIs of 60 adult patients with symptomatic ankles were included. The presence and sizes of peroneal tubercle and retrotrochlear eminence (RTE), the prevalence of peroneus quartus (PQ), os peroneum, and boomerang-shaped peroneus brevis (PB) tendon, the shape of the retromalleolar fibular groove (RMFG), and the location of the PB muscle–tendon junction were evaluated. The relationships of these variations with peroneal tendinopathies were assessed. The correlations between pathological peroneal conditions on MRI and clinical findings were evaluated.

Results

Peroneal tubercle (mean size, 3.2 mm) and RTE (mean size, 4.5 mm) were identified in 58 (84%) and 69 (100%) ankles respectively. PQ muscle, os peroneum, and boomerang-shaped PB tendon were found in 9 (13%), 7 (10%), and 24 (34.8%) ankles respectively. The RMFG was concave, flat, convex, and irregular in 14 (20.3%), 40 (58%), 13 (18.8%), and 2 (2.9%) ankles respectively. Sixteen (23.2%) patients had low-lying PB muscle belly. Only boomerang-shaped PB tendons showed a significant relationship with peroneal tendinopathies. MRI and clinical findings had a poor correlation in pathological peroneal conditions and both had low sensitivity in diagnosis.

Conclusion

Lateral ankle anatomical variations are common and cannot be attributed to pathological conditions of the peroneal tendon, except for boomerang-shaped PB tendons. Both clinical and MRI findings have low sensitivity in the diagnosis of peroneal tendinopathies, which are often incidental findings on MRI.

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Authors and Affiliations

  1. Department of Radiology, Gazi University Faculty of Medicine, Ankara, Turkey

    Elif Ersoz, Nil Tokgoz & Murat Ucar

  2. Department of Orthopedics and Traumatology, Gazi University Faculty of Medicine, Ankara, Turkey

    Ahmet Y. Kaptan & Akif M. Ozturk

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  1. Elif Ersoz
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  2. Nil Tokgoz
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  3. Ahmet Y. Kaptan
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  4. Akif M. Ozturk
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  5. Murat Ucar
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Correspondence to Elif Ersoz.

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Ersoz, E., Tokgoz, N., Kaptan, A.Y. et al. Anatomical variations related to pathological conditions of the peroneal tendon: evaluation of ankle MRI with a 3D SPACE sequence in symptomatic patients. Skeletal Radiol 48, 1221–1231 (2019). https://doi.org/10.1007/s00256-019-3151-5

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  • DOI: https://doi.org/10.1007/s00256-019-3151-5

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