Frog-leg position

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Frog-leg position
seen in

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[A] Rheumatoid arthritis
[B] Cauda equina syndrome
[C] Intramedullary tumor of Spinal cord
[D] Caudal regression syndrome

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Conditions where frog-leg position is typically seen:

1. Rickets 🦴
   • Children with rickets often lie in a frog-leg position because of muscle weakness and soft bones, especially at the hips and knees.
   • It helps them feel more comfortable and reduces strain on weak lower limb muscles.
2. Developmental Dysplasia of the Hip (DDH) 👶
   • The frog-leg position is used both spontaneously by infants with hip laxity and deliberately in X-rays (frog-leg lateral view) to evaluate hip joints.
3. Neuromuscular Disorders (e.g., spinal muscular atrophy, poliomyelitis, myopathies)
   • Weakness of the hip and thigh muscles causes legs to fall outward into a frog-leg posture.
4. Cerebral Palsy (Hypotonic type)
   • Hypotonic infants may lie in a frog-leg position due to poor muscle tone and inability to hold legs together.

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✅ Classic Teaching

• Rickets → child lies in frog-leg posture.
• Infantile hypotonia / SMA / DDH → frog-leg position is a clue.
• Radiology → frog-leg lateral X-ray view of hips.

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Caudal regression syndrome – also called as

• • sacral agenesis
  • hypoplasia of the sacrum

Frog-leg position: child’s legs bend with their knees pointed outward and their feet in line with their hips.

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Can be seen in –

• Natural resting position for babies
• Caudal regression syndrome
• Hypotonia

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CC BY 2.0 https://creativecommons.org/licenses/by/2.0, via Wikimedia Commons

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Antero-posterior radiographic view, showing missing ribs, absent lumbosacral vertebrae, hypoplastic pelvis and “frog-like” position of the lower extremities.

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