case_images: PMC11796310_01
case_images: The initial X-ray of the shoulder reveals a depression in the humeral head without any evidence of dislocation or fracture.. No associated cortical disruption or malalignment is noted. Therefore, this would indicate an impaction injury at the bone, which may be clinically relevant in shoulder instability.
case_images: cureus-0017-00000078464-i01.jpg
case_images: PMC11796310_01_cureus-0017-00000078464-i01.jpg
case_images: FIG1
case_images: The initial radiographic evaluation, including a shoulder X-ray, revealed a depression in the humeral head but did not show evidence of dislocation (Figure 1).
case_images: The CT scan of the shoulder shows an irregular depression to the subchondral bone of the anterosuperior humeral head, with the glenohumeral articulation remaining intact.. These findings indicate an impaction injury, which might be significant for shoulder stability and clinical management.
case_images: cureus-0017-00000078464-i02.jpg
case_images: PMC11796310_01_cureus-0017-00000078464-i02.jpg
case_images: FIG2
case_images: MRI of the shoulder reveals a large glenohumeral joint effusion suggesting spontaneous reduction following a posterior shoulder dislocation during an electrical event.. The findings would support a diagnosis of spontaneous reduction of a posterior shoulder dislocation, most likely secondary to an electrical event. There is no associated evidence of a rotator cuff tear or significant labral injury. Features of occult instability of electrically induced shoulder dislocations are shown.
case_images: cureus-0017-00000078464-i03.jpg
case_images: PMC11796310_01_cureus-0017-00000078464-i03.jpg
case_images: FIG3
case_images: Subsequent MRI findings include soft tissues with a large glenohumeral joint effusion (Figure 3).
case_images: MRI of the shoulder reveals an incomplete inferoanterior to posterior labral tear and reverse Hill-Sachs deformity associated with a previous posterior shoulder dislocation.. These findings suggest residual structural changes following posterior instability that may imply implications for shoulder function and future dislocation risk.
case_images: cureus-0017-00000078464-i04.jpg
case_images: PMC11796310_01_cureus-0017-00000078464-i04.jpg
case_images: FIG4
case_images: Concerning the bones and bone marrow, the anterior humeral head compression fracture is consistent, in this case, with the classic reverse Hill-Sachs deformity from the previous posterior shoulder dislocation (Figure 4).