These are rare injuries and can often be treated nonoperatively if the extensor mechanism is intact.
These fractures are classified by UCPF as V.4-A.
Avulsion fractures e.g. avulsion of the tibial tubercle.
Plain X-rays remain the first line of investigation.
CT scan can be used to assess the size and position of fragments, implant stability, and bone stock.
Comparison with previous X-rays is useful.