GOOD NEWS: We have fixed the DICOM uploading problem. New cases should work fine. More info

Patella alta

Case contributed by M Mourits
Diagnosis almost certain


Bilateral knee pain

Patient Data

Age: 20 years
Gender: Female

XR both knees AP & lateral


Length of patella ligament is 6.4 cm.

Diagonal length of patella is 4.0 cm.

Case Discussion

This case demonstrates a patella alta, confirmed by Insall-Salvati ratio:

- length of patella ligament = diagonal length of patella;
- variations of more than 20% are considered abnormal

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.