Heejin Park MD, Presenter: Nothing to Disclose

Chan-Sup Park MD, PhD, Abstract Co-Author: Nothing to Disclose

To evaluate the accuracy of magnetic resonance (MR) findings of peroneus tendon disorders by comparing with surgical findings.

Seventy patients (M: F=39:31, mean age, 36 years) with clinically suspected peroneal disease underwent MR imaging and surgery. Sagittal, coronal and axial T1-weighted spin-echo and T2-weighted fast spin-echo images were obtained in all patients. Two independent, blinded observers evaluated the MR images without clinical information and the results were compared with surgical findings. They were peroneal split, increased signal intensity, enlargement of tendon, fluid collection, superior peroneal retinaculum (SPR) injury and, dislocation of tendon.

On MR imaging, peroneus brevis (PB) tendon split was most common, followed by fluid collection of more than moderate grade and increased signal of PB tendon. Dislocation and SPR injuries were less common. On surgery, fluid collection and PB split and partial tears were relatively common. In PB injury, the increased signal intensity of the tendon was more sensitive (67%) and specific (95%). In peroneus longus (PL) injury, similar sensitivity and specificity between increased signal and swelling were noted. Peritendinal fluid collection was less sensitive (25%) but specificity was relatively high (90%). The incidence of unremarkable findings was about 40%. The unremarkable findings were more specific (96%) than sensitive (61%).

There was significant difference in the results between MR findings and surgical findings. The positive findings of the PB and the PL were more specific than sensitive and the positive findings of the PB were more sensitive than that of the PL, but specificities were similar.

the limit of MR evaluation of ankle

Park, H, Park, C, The Accuracy of the MR Findings of Peroneal Tendon Disorders: Comparison with Surgical Findings.  Radiological Society of North America 2010 Scientific Assembly and Annual Meeting, November 28 - December 3, 2010 ,Chicago IL. http://archive.rsna.org/2010/9008465.html