Figure 4. Use the M-mode marker to center the transducer over the space between the glenoid fossa and humeral head. With an 18–21 g, 3.5-inch spinal needle attached to a control syringe, advance the needle tip just parallel to the probe, just under the scapular spine.
Figure 4. Use the M-mode marker to center the transducer over the space between the glenoid fossa and humeral head. With an 18–21 g, 3.5-inch spinal needle attached to a control syringe, advance the needle tip just parallel to the probe, just under the scapular spine.
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