Knee / Patella

Nail-Patella Disease (Fong disease, many other names)

• Disease of mesoderm and ectoderm origins

• Presentation

  • Hypoplastic/absent nails

  • Recurrent knee dislocations

  • Flexion contractures

• Imaging Findings

  • Basically any patella abnormality with likely recurrent patella dislocations

  • Hypoplastic radial head/capitulum with likely recurrent elbow dislocations

  • Bilateral posterior iliac horns (Fong prongs)

  • Flared iliac crest with protuberant iliac spines

  • Apparently if you are shown the iliac horns alone that is enough to diagnose, don’t need to see the patellas

Sinding-Larsen-Johansson

• Basically osgood-schlatter but for the inferior aspect of the patella from chronic repetitive tugging by the proximal aspect of the patellar tendon

• Seen in kids (10-14 typically - have to be active enough to get this)

• In adults = jumpers knee

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