Table 2.

Formulas developed to obtain the patellar height value using the Insall–Salvati index on CT in extension (ISE), 20 degrees of flexion (ISF) and quadriceps contraction (ISC) in the presence of the Insall–Salvati index obtained at the radiographic assessment (R) supported by one foot only, in male and female patients.

	Patellar height conversion equations
	Male	Female
Extension	ISE = 0.11 + 0.78 × R	ISE = 0.03 + 0.84 × R
20 degrees of flexion	ISF = 0.12 + 0.85 × R	ISF = 0.02 + 0.95 × R
Quadriceps contraction	ISC = 0.14 + 0.84 × R	ISC = 0.02 + 0.96 × R