[Secondary changes in the hip joints of children with progressive muscular dystrophy]

Area of Science:

• Pediatric Orthopedics
• Neuromuscular Disorders
• Genetics

Background:

• Progressive muscular dystrophy (PMD) often presents with significant muscle hypotonia.
• Lower extremity muscle weakness in pediatric patients can affect skeletal development and joint stability.
• Spinal muscular atrophy, particularly Werdnig-Hoffmann disease, is a common cause of severe infantile hypotonia.

Purpose of the Study:

• To investigate the incidence of secondary femur dislocations and semi-dislocations in children with progressive muscular dystrophy.
• To determine the correlation between the severity of muscle hypotonia and the occurrence of hip joint instability.
• To highlight the orthopedic complications associated with neuromuscular disorders in pediatric populations.

Main Methods:

• Retrospective analysis of 32 pediatric patients diagnosed with progressive muscular dystrophy.
• Clinical examination to assess muscle tone and identify hip joint abnormalities.
• Radiographic evaluation for the detection of femur dislocations and semi-dislocations.

Main Results:

• Secondary dislocations and semi-dislocations of the femur were identified in 18 out of 32 patients (56.25%).
• The majority of affected patients had Werdnig-Hoffmann spinal amyotrophy, characterized by profound muscular hypotonia.
• A strong association was observed between gross muscular hypotonia and the development of hip joint instability.

Conclusions:

• Marked hypotonia in pediatric progressive muscular dystrophy significantly increases the risk of secondary femur dislocations.
• Early orthopedic monitoring and intervention are crucial for managing hip instability in children with neuromuscular diseases.
• Werdnig-Hoffmann disease is a critical condition to consider when evaluating hip dislocations in infants and children.