Jon Hyman MD Jon Hyman MD
  • Stanford University
  • Stanford University

X-Ray Library Patella

This section is intended to give you a little more detail about what your particular problem or injury looks like radiographically (by X-ray images).

The images on this page represent normal patellar (knee cap) anatomy as well as X-rays of knees with chondromalacia (thin and softening cartilage) and Degenerative Joint Disease (DJD). Some images show what the knee cap looks like if it 'pops' out of place (which is called subluxating/slipping or dislocating). There are a few images which demonstrate how some of these problems can be fixed.

image Neutral position
Neutral position

image Subluxated or tilted
Subluxated or tilted

image Full dislocation
Full dislocation

image Xray Position
Xray Position


image thick cartilage space
thick cartilage space

image thin space and bone spurs
thin space and bone spurs

image tilted alignments on top
tilted alignments on top

image lateral tilting
lateral tilting

image before / after lateral release
before / after lateral release

image at risk for slipping out <br>/ subluxating
at risk for slipping out
/ subluxating


image Fixed with a wire
Fixed with a wire

image Fixed with screws
Fixed with screws

image Fixed with Pins and wire <br>(tension band)
Fixed with Pins and wire


image Patella Fracture Patterns
Patella Fracture Patterns

image lateral release medial  repair
lateral release medial repair

image tibial tubercle transfer
tibial tubercle transfer

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