Clin Orthop Surg.  2016 Mar;8(1):123-126. 10.4055/cios.2016.8.1.123.

Osteochondroma Arising from Anterior Inferior Iliac Spine as a Cause of Snapping Hip

Affiliations
  • 1Department of Orthopaedic Surgery, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, Korea. mozart13@khu.ac.kr
  • 2Department of Orthopaedic Surgery, Icheon Hospital, Gyeonggi Provincial Medical Center, Icheon, Korea.

Abstract

Snapping hip syndrome is a relatively common problem that can be easily managed with conservative treatment. This syndrome can be divided into external, internal and intra-articular types. Internal snapping hip syndrome is the rarest amongst these and its etiology is not well understood. We report a unique case of osteochondroma arising from the anterior inferior iliac spine (AIIS), which caused the internal snapping hip syndrome with hip pain and restriction of activity. This rare case of snapping hip syndrome from the AIIS was treated surgically and the symptoms completely disappeared after excision of the tumor.

Keyword

Osteochondromas; Ilium; Hip Joint/physiopathology; Tendons/physiopathology

MeSH Terms

Adult
*Bone Neoplasms
Female
*Hip Joint/diagnostic imaging/physiopathology
Humans
*Ilium/diagnostic imaging/physiopathology
*Joint Diseases/etiology/physiopathology
*Osteochondroma

Figure

  • Fig. 1 The anteroposterior view of pelvis (A) shows abnormal bony contour around the right acetabular roof and the internal oblique view (B) demonstrates an irregularly calcified, pedunculated lesion arising from the right ilium. It presents as a peripheral outgrowth with its cortex in continuity with the ilium (arrow).

  • Fig. 2 Three-dimensional computed tomography scans show a pedunculated exostotic mass about 3.3 cm × 2.8 cm × 2.0 cm in size.

  • Fig. 3 Low signal on T1- and T2-weighted images and T2 fat suppression sagittal images show the thin cartilaginous cap over exostosis as band of high signal intensity (arrowheads). The displaced and compressed iliopsoas musculotendinous junction is seen on the T1-weighted image (arrow).

  • Fig. 4 (A) Gross appearance of the specimen after removal is typical with an osteochondroma. (B) Photomicrograph of the cartilage cap at the margin of the exostosis demonstrates the reflected layer of the periosteum over the exostosis and irregularity of the chondrocytes within the cartilage cap. Endochondral ossification is apparent at the base of the cap (H&E, × 40).


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