Abstract
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Describe the proposed injury mechanisms leading to concurrent peroneal tendon dislocation and Achilles tendon rupture.
Explain the diagnostic advantages of dynamic sonography compared with magnetic resonance imaging (MRI) for detecting peroneal tendon dislocation.
Identify key clinical and imaging features that contribute to delayed or missed diagnosis of peroneal tendon dislocation associated with Achilles tendon rupture.
1. According to the article, what shared biomechanical mechanism contributes to both peroneal tendon dislocation and Achilles tendon rupture? A. Forced dorsiflexion with eversion and eccentric muscle contraction B. Repetitive inversion during weight bearing C. Chronic plantarflexion with concentric contraction D. Direct blunt trauma to the lateral malleolus
2. What structure detaches from the lateral malleolus to result in peroneal tendon dislocation? A. Inferior peroneal retinaculum B. Superior peroneal retinaculum C. Calcaneofibular ligament D. Posterior talofibular ligament
3. Which imaging modality allows real-time visualization of tendon instability during ankle movement? A. Computed tomography B. Radiography C. Magnetic resonance imaging (MRI) D. Sonography
4. According to the article, what clinical factor most commonly contributes to missed diagnosis of peroneal tendon dislocation when Achilles tendon rupture is present? A. Absence of ankle swelling B. Patient focus on gait disturbance from Achilles tendon rupture C. Immediate surgical intervention D. Presence of calcaneal fracture
5. What sonographic finding supported the diagnosis of peroneal tendon dislocation in patient case 2 when magnetic resonance imaging (MRI) findings were inconclusive? A. Tendon thickening at rest B. Hyperechoic scar tissue C. Dynamic dislocation of the peroneus longus tendon D. Calcification of the superior peroneal retinaculum
6. What ankle maneuver during sonographic examination can reproduce peroneal tendon dislocation? A. Dorsiflexion–eversion B. Neutral ankle positioning C. Passive eversion only D. Plantarflexion–inversion
7. According to the article, delayed diagnosis of peroneal tendon dislocation may lead to which outcome? A. Spontaneous symptom resolution B. Improved functional recovery C. Reduced need for surgical intervention D. Chronic instability and persistent symptoms
Footnotes
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