Fracture around loose patellar component and poor bone stock

These are extremely challenging fractures because lack of bone of stock is a barrier to reimplantation of the component. Resection arthroplasty is often indicated.

These fractures are classified by UCPF as V.34-B3.

These fractures often occur with no or minimal trauma, including intraoperatively during revision arthroplasty surgery.

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.