Neurology
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B. J. Kim, MD, PhD, S. B. Koh, MD, PhD, K. W. Park, MD, PhD, S. J. Kim, MD, PhD and J. S. Yoon, MD, PhD

From the Departments of Neurology (B.J.K., S.B.K., K.W.P.) and Rehabilitation Medicine (S.J.K., J.S.Y.), College of Medicine, Korea University, Seoul.


Figure 117
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  		Figure 1 Angle of the elbow when the ulnar nerve was dislocated

The ulnar nerve (*) moved onto the tip of the medial epicondyle when the elbow was flexed and finally dislocated at 125 degrees of flexion.

 

Figure 217
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  		Figure 2 Stimulation points for the short-segment ulnar nerve conduction study

The black dots represent the stimulation points for the ulnar nerve located in the ulnar groove (marked without prime). The ragged dots indicate the stimulation points for the dislocated ulnar nerve tracked by ultrasonography (marked with a prime). P = midpoint in the ulnar groove between the tip of the medial epicondyle and the olecranon. P2 = 2 cm proximal to point P. D2 = 2 cm distal to point P. P' = the closest ulnar nerve point from the tip of the medial epicondyle tracked by ultrasonography. MET = medial epicondyle tip.

 

Figure 317
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  		Figure 3 Example of short-segment ulnar nerve conduction study

Conduction block on the point P2 with traditional site (black dots in figure 2) stimulation was transformed to normal waves by stimulation with ultrasound-guided nerve localization (ragged dots in figure 2).

 




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