Fracture around loose patellar component and good bone stock

These fractures are challenging to treat because the revision of the component with fracture fixation is difficult to achieve.

These fractures are classified by UCPF as V.34-B2.

Fall onto flexed knee.

There might be evidence of preceding pain and loss of function.

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.