title: Inversion of the acetabular labrum triggers rapidly destructive osteoarthritis of the hip: representative case report and proposed etiology.
abstract: The pathophysiology of rapidly destructive osteoarthritis (OA) of the hip is unknown. This study documented cases of inversion of the acetabular labrum, which has clinicoradiologic features similar to those of initial-stage rapidly destructive hip OA. Our study was based on a prospective review of data for 9 patients with rapidly destructive hip OA. Intraoperative findings showed that the anterosuperior portion of the acetabular labrum had inverted into the articular space, along with many fragments of articular cartilage, in all patients. Subchondral insufficiency fractures of the femoral heads were seen just under the inverted labra in 8 of the 9 patients. Inversion of the acetabular labrum may be involved in rapid joint-space narrowing and subchondral insufficiency fracture in rapidly destructive hip OA.
authors: Department of Orthopaedic Surgery, Kanazawa Medical University, Kahoku-gun, Japan.
authors: Kiyokazu
authors: K
authors: Fukui
authors: Department of Orthopaedic Surgery, Kanazawa Medical University, Kahoku-gun, Japan.
authors: Ayumi
authors: A
authors: Kaneuji
authors: Department of Pathology and Medical Laboratory, Kanazawa Medical University, Kahoku-gun, Japan.
authors: Mana
authors: M
authors: Fukushima
authors: Department of Orthopaedic Surgery, Kanazawa Medical University, Kahoku-gun, Japan.
authors: Tadami
authors: T
authors: Matsumoto
mesh_terms: D000077:Acetabulum / Q000473:pathology*; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005270:Femur Head / Q000473:pathology*; D051445:Fibrocartilage / Q000473:pathology*; D015775:Fractures, Stress / Q000209:etiology; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology / Q000601:surgery; D011446:Prospective Studies; D011859:Radiography
keywords: acetabular labrum; inversion; joint-space narrowing; rapidly destructive osteoarthritis of the hip; subchondral insufficiency fracture