Sonography of the knee in normal and abused infants

Area of Science:

• Pediatric Radiology
• Musculoskeletal Imaging

Background:

• Infant knee sonography offers excellent visualization of non-ossified cartilage and soft tissues.
• Normal sonographic anatomy is characteristic and readily learned.
• Radiographic findings in infants require careful interpretation to distinguish abuse from other conditions.

Purpose of the Study:

• To highlight the utility of sonography in evaluating infant knee abnormalities.
• To differentiate between findings suggestive of child abuse and those related to metabolic bone disease.
• To emphasize the importance of accurate diagnosis in cases of suspected non-accidental trauma.

Main Methods:

• Sonographic examination of infant knees.
• Correlation of sonographic findings with radiographic and clinical data.
• Review of cases involving suspected child abuse and metabolic bone disease.

Main Results:

• Sonography effectively visualizes normal infant knee anatomy.
• Ultrasound can confirm subtle or questionable radiographic abnormalities in abused infants.
• Sonography aids in detecting occult epiphyseal fractures in infants with metabolic bone disease.
• Metaphyseal abnormalities from neonatal rickets can be identified and differentiated from abuse.

Conclusions:

• Infant knee sonography is a valuable, accessible tool for diagnosing knee abnormalities.
• It plays a critical role in evaluating suspected child abuse and metabolic bone disease.
• Distinguishing rickets from abuse-related injuries is essential for appropriate clinical management.