Criteria

MRI findings in OSD[13]

  • Normal

  • Early

    • Oedema at the tibial tubercle

  • Progressive

    • Partial avulsion of the secondary ossification centre, usually pulled proximally

  • Terminal

    • Complete separation of the avulsed secondary ossification centre

    • Swelling of the patellar tendon, indicating patellar tendonitis as a secondary pathological change in OSD

  • Healing

    • The separated fragment is either ossified into a separate ossicle, or healed back to the apophysis via ossification of a fibro cartilaginous bridge that spanned the gap between the apophysis and the fragment.

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