Grelsamer classification of sagittal patellar morphology

Last revised by Henry Knipe on 30 Oct 2023

Citation, DOI, disclosures and article data

Citation:

Knipe H, Grelsamer classification of sagittal patellar morphology. Reference article, Radiopaedia.org (Accessed on 09 May 2024) https://doi.org/10.53347/rID-177833

DOI:

https://doi.org/10.53347/rID-177833

Permalink:

https://radiopaedia.org/articles/177833

rID:

177833

Article created:

25 Oct 2023, Henry Knipe ◉

Disclosures:

At the time the article was created Henry Knipe had the following disclosures:

Integral Diagnostics, Shareholder (ongoing)
Micro-X Ltd, Shareholder (ongoing)

These were assessed during peer review and were determined to not be relevant to the changes that were made.

View Henry Knipe's current disclosures

Last revised:

30 Oct 2023, Henry Knipe ◉

Disclosures:

At the time the article was last revised Henry Knipe had the following disclosures:

Integral Diagnostics, Shareholder (ongoing)
Micro-X Ltd, Shareholder (ongoing)

These were assessed during peer review and were determined to not be relevant to the changes that were made.

View Henry Knipe's current disclosures

Revisions:

1 time, by 1 contributor - see full revision history and disclosures

Systems:

Musculoskeletal

Tags:

cases, case3

The Grelsamer classification of sagittal patellar morphology has some relevance regarding measuring patellar height.

Classification

The Grelsamer classification is based on the ratio of total patellar length to patellar articular surface length on a lateral knee x-ray. Greslamer divided sagittal patellar morphology into three types ^1,2:

type I
- rounded lower pole
- total patellar length:patellar articular surface length between 1.2-1.5
type II
- elongated lower pole (Cyrano nose)
- total patellar length:patellar articular surface length >1.5
- can lead to underestimation of patellar height using the Insall-Salvati ratio ³
type III
- flattened power pole
- total patellar length:patellar articular surface length <1.2