PMC4197906_01
Anteroposterior radiograph of the left hip. One of the screw breakages (black arrow head) 13 years after surgery (A). No trabeculae crossed the original joint space. The distal portion of the broken screw (black arrow) migrated into the pelvis 21 years after the surgery (B).
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Over the next 13 years, radiography of the hip joint revealed that one of the screws was broken and no trabeculae crossed the original joint space (Fig. 1A). The distal part of the broken screw gradually migrated medially and deep into the pelvis through the medial wall of the acetabulum 21 years after the surgery (Fig. 1B).
Computed tomography image and angiogram of the pelvis. The tip of the screw migrated into the pelvis (A). Angiogram of the iliac artery showing that the iliac artery was compressed (white arrow) by the tip of the migrating screw (B).
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Computed tomography of the pelvis demonstrated that the distal part of the screw migrated into the pelvis (Fig. 2A). Angiography of the iliac artery showed arterial compression by the screw (Fig. 2B).
Intraoperative photography. The distal tip of the screw was located between the iliac artery (white arrow) and vein (black arrow).
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The distal tip of the screw was located between the medial portions of the left external iliac vessels (Fig. 3).
Anteroposterior radiograph of the left hip. The distal portion of the broken screw was removed.
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Postoperative radiography of the pelvis showed removal of the medial piece of the broken screw (Fig. 4).