**3.9 Flexor digitorum profundus (FDP)**

The child may be sitting on a chair with the elbow supported on the table or a child lying supine arm on the side of the body in some abduction. Elbow should be completely flexed, forearm in the mid-prone position. Make a line proximally from the olecranon to the distal medial wrist crease (line 1). The needle entry point is the needle entry point in the proximal one-third to the distal two-thirds junction of the forearm, just anterior to the ulnar shaft or midpoint between the ulnar shaft and line 1. Here, it traverses through flexor carpi ulnaris. So, we are more distal. We may inject it into FCU. So, inject between proximal one-fourth to proximal one-third. Passive extension of distal interphalangeal (DIP) joints will elicit the best needle movement. Individual fascicles may be injected with expertise and US guidance (**Figure 18**).
