Patella alta

Case contributed by Dr M Mourits

Presentation

Bilateral knee pain

Patient Data

Age: 20 years
Gender: Female

Plain films both knees (AP and lateral)

X-ray

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

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