Modified Insall-Salvati ratio
Radiography (Lateral)
a : length of patellar tendon
b : lenght of articular surface of patella
Modified Insall-Salvati index = a / b
Patella alta >2
Synonyms: Grelsamer index
Biedert RM. Patellofemoral Disorders, Diagnosis and Treatment. Wiley. (2005).
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