Fluid within the olecranon bursa and surrounding hyperaemia. Fluid forced out of the posterior joint on extension of the elbow from a flexed position.
Swollen, hypoechoic common extensor tendon origin, no neovascularisation (not shown). The pathological change extended across the width of the tendon complex. Note the slight concavity to the contour of the tendon, which may imply chronic change, and the pathological radial collateral ligament deep it.
Note the hypoechoic, fusiform thickening and deviation from the normal course of the right PIN compared to the left. There may be a small band of scar tissue at the right arcade of Frohse causing the entrapment, although this is not conclusive.
Hypoechoic change within the common flexor tendon origin. Minor amount of neovascularity (not shown) and point tenderness probably implying acute change.
The hypoechoic change spans the posterior half of the CFTO, thus involving all of the FCU and part of the FDS fibres.
The ulnar nerve is shown dislocating out of the cubital tunnel over the medial epicondyle on elbow extension bilaterally. There is minor oligofascicular change to the normal polyfascicular pattern of the nerve. Note the medial subluxation/dislocation of the triceps muscle over the olecranon and into the cubital tunnel helping force the ulnar nerve out.