Hip Morphology in Mucolipidosis Type II.

Area of Science:

• Medical Imaging
• Genetics and Genetic Diseases
• Skeletal Dysplasias

Background:

• Mucolipidosis type II (MLII) is a rare lysosomal storage disorder.
• Defective lysosomal enzyme trafficking is the underlying cause of MLII.
• Severe skeletal abnormalities, particularly hip dysplasia, are characteristic of MLII.

Purpose of the Study:

• To characterize hip morphology in MLII patients.
• To investigate the natural progression of hip pathologies in MLII.
• To establish a baseline for evaluating future therapies.

Main Methods:

• Systematic evaluation of plain radiographs, ultrasounds, and MRI.
• Retrospective chart review of international, two-centered MLII patient data.
• Inclusion criteria: MLII diagnosis with at least one pelvic radiograph.

Main Results:

• Common radiographic findings included femoral cloaking, rickets/hyperparathyroidism-like changes, and supra-acetabular/femoral neck constrictions.
• Acetabular and migration indexes showed significant worsening in female patients.
• Overall, no substantial progression of acetabular dysplasia was observed across the study group.

Conclusions:

• Understanding MLII hip morphology is crucial for early diagnosis and management.
• This study provides insights into the natural history of hip disease in MLII.
• Findings can aid in assessing the skeletal impact of emerging MLII treatments.