A total of 47 non-walking patients (52 hips) with severe cerebral palsy and with a mean age of 14 years, (9 to 27) underwent a Dega-type pelvic osteotomy after closure of the triradiate cartilage, together with a derotation varus-shortening femoral osteotomy and soft-tissue correction for hip displacement which caused pain and/or difficulties in sitting. The mean follow-up was 48 months (12 to 153). The migration percentage improved from a pre-operative mean of 70% (26% to 100%) to 10% (0% to 100%) post-operatively. In five hips the post-operative migration percentage was greater than 25%, which was associated with continuing pain in two patients. Three patients had persistent hip pain and a migration percentage less than 25%. In five hips a fracture through the acetabulum occurred, and in another there was avascular necrosis of the superior acetabular segment, but these had no adverse effect on functional outcome. We conclude that it is possible to perform a satisfactory pelvic osteotomy of this type in these patients after the triradiate cartilage has been closed.

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http://dx.doi.org/10.1302/0301-620X.88B7.17506DOI Listing

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Article Synopsis
  • The study aimed to explore the relationship between pelvic parameters, specifically pelvic incidence (PI), and skeletal maturity as measured by the modified Oxford Hip Score (mOHS).
  • Data from CT scans of 193 children and adolescents were analyzed, revealing significant positive correlations between age and all mOHS components, with weak correlations between mOHS and PI.
  • The research concluded that while there is a weak correlation between mOHS and PI, the triradiate cartilage and lesser trochanter cartilage status may be important anatomical factors for future studies.
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Acetabular rim syndrome revisited.

Bone Joint J

December 2024

Scottish Rite for Children, Dallas, Texas, USA.

Aims: There has been limited literature regarding outcomes of acetabular rim syndrome (ARS) with persistent acetabular os in the setting of acetabular dysplasia. The purpose of this study was to characterize a cohort of adolescent and young adult patients with ARS with persistent os and compare their radiological and clinical outcomes to patients with acetabular dysplasia without an os.

Methods: We reviewed a prospective database of patients undergoing periacetabular osteotomy (PAO) for symptomatic acetabular dysplasia between January 1999 and December 2021 to identify hips with preoperative os acetabuli, defined as a closed triradiate cartilage but persistence of a superolateral os acetabulum.

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The acetabular triradiate cartilage is the main structure that determines the development of the acetabulum. Furthermore, the paucity of data in the literature and lack of consensus amongst physicians following diagnosis regarding whether to treat these fractures operatively or non-operatively places the physician with a challenging choice. Here, we report a case of a 13-year-old boy who suffered a triradiate cartilage fracture from a high-energy motorcycle crash and presented with a displaced, left T-type acetabulum fracture.

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Background: While often used, Hilgenreiner's line may not always be a reliable reference plane following triple innominate pelvic osteotomy or trauma to the triradiate cartilage. The inferior sacral-iliac line is a horizontal line connecting the sclerotic corners of the inferior sacral-iliac joints. This is a consistent landmark in the ossifying infant pelvis as well as the fully developed adult pelvis.

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Abnormal hip bone morphologies are associated with various diseases of the hip joint. Weight bearing, especially during growth, may be important to achieve normal acetabulum development. This study aimed to investigate whether hip bone morphologies were affected by hindlimb suspension (HS) in 4 week-old rats.

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