Imaging of Posterior Interosseous Neuropathy following Distal Biceps Repair: A Report of 3 Cases

Figure 1

Axial T1 ((a), (b)) and T2 fat saturated images (c) from patient 1. (a) demonstrates the PIN in the supinator tunnel just proximal to the exit point of the radial tunnel posterolaterally where it is clearly identified (white arrow). Slightly more distally, (b), artifact from the cortical fixation button obscures the plane of the PIN (circle). A pattern of muscle edema involving the ECU, EDC, EDM, and supinator muscles is consistent with injury to the PIN in (c).

(a)

(b)

(c)