Pires Classification (Interprosthetic Femur Fracture)
Derives the Pires type of a femur fracture between a hip stem and a knee femoral component on the same side.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Knee femoral component
- Unstemmed knee femoral component
- Fracture site
- Closer to the hip stem
- Hip stem fixation
- Loose
- Knee component fixation
- Well fixed
Result: Pires type IB: a fracture closer to the hip stem than to the unstemmed knee component; the hip stem is loose and the knee component well fixed.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Knee femoral component
- Fracture site (needed when the knee component is unstemmed)
- Hip stem fixation
- Knee component fixation
- Bone between the implants (needed when the knee component is stemmed)
How this is calculated
Citation
Pires RES, et al. Interprosthetic femoral fractures: proposed new classification system and treatment algorithm. Injury. 2014;45(suppl 5):S2-S6. Gheewala RA, Young JR. Clin Orthop Relat Res. 2022;480(9):1666-1671. Read the sources: Pires 2014 ↗, Gheewala 2022 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.