Paprosky Classification (Acetabular Bone Loss)
Derives the Paprosky type (1, 2A to 2C, 3A or 3B) of acetabular bone loss before revision hip arthroplasty from the radiograph.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Hip center migration
- More than 2 cm (3 cm in the later description)
- Direction of migration
- Superolateral (up and out)
- Kohler line
- Intact
Result: Paprosky type 3A: severe loss of the walls and posterior column with superolateral ("up and out") migration; the Kohler line holds.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Hip center migration
- Direction of migration
- Kohler line (anterior column)
- Teardrop (medial wall)
- Ischium (posterior column)
How this is calculated
Citation
Paprosky WG, Perona PG, Lawrence JM. Acetabular defect classification and surgical reconstruction in revision arthroplasty. J Arthroplasty. 1994;9(1):33-44. Criteria as tabulated in Telleria JJM, Gee AO. Clin Orthop Relat Res. 2013;471(11):3725-3730. Read the sources: Paprosky 1994 ↗, Telleria 2013 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.