PMC7446554_01
Anteroposterior radiographs of whole spine.
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She had congenital scoliosis, for which she had undergone spinal arthrodesis as a junior high school student (Figure 1).
(a) Right side and (b) Left side. Bilateral anterioposterior radiographs show hypoplasia of the humeral trochlea and medial epicondyle and slight medial shift of the olecranon. The carrying angles of both sides were 9 .
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The carrying angle of bilateral elbows was 9  (Figure 2(a) and (b)).
(a and b) Ulnar nerve groove view of radiographs of bilateral elbows showed hypoplasia of the ulnar nerve groove.
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Axial view of computed tomography showing hypoplasia of the ulnar nerve groove.
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Axial view obtained using ultrasonography shows hypoplasia of the medial epicondyle and the ulnar nerve groove (arrowheads) and ulnar nerve luxation to anterior and enlargement of cross-sectional area of ulnar nerve proximal to the origin of the FCU (arrow).
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It also showed enlargement of the cross-sectional area of ulnar nerve proximal to the origin of the FCU (Figure 5).
(a) Intermuscular septum of upper arm and Osborn's ligament were absent. The ulnar nerve was identified proximally, anterior at the upper arm. The ulnar nerve was compressed by the fibrous bundle over the flexor carpi ulnaris (FCU) (arrow). (b) Decompression was performed by releasing the fibrous band and FCU fascia and deep flexor-pronator aponeurosis. Neuroedema of the ulnar nerve caused by compression was found at the proximal position of the fibrous bundle (arrow). (c) The ulnar nerve (arrow) was covered by a pedunculated fat flap.
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Neuroedema of the ulnar nerve caused by compression was found at the proximal position of the fibrous bundle (Figure 6(a)). Decompression was performed by releasing the fibrous band and FCU fascia and deep flexor-pronator aponeurosis (Figure 6(b)). The ulnar nerve was covered by a pedunculated fat flap (Figure 6(c)).