Insall and Salvati Method
- in normal knees, constant relationship exists between length of patella (LP) and length of the patella tendon (LT);
- length of tendon (LT) is measured on its post surface from the lower pole of patella to its insertion on top of tibial tubercle;
- length of patella by definition is greatest diagonal length measured;
- ratio of LP to LT is 1:0, with less than 20% variation;
- hence, length of Patellar Tendon is approx. = to length of the patella;
- avg. ratio (LT/LP) = 1.02 w/ SD of 0.13;
- LP to LT ratio of less than 1:0 indicates possible Patella Alta;
- describes normal patellar ht. in relationship to Patellar Tendon;
- Aglietti, et al. (1983)
- 150 rt knees:
- LT/LP ratio: 1.04 (0.8 to 1.38) males = 1.01 vs females = 1.06
- Patellar pain and incongruence. I: Measurements of incongruence.
Observations on patellar height after proximal tibial osteotomy.
The modified Insall-Salvati ratio for assessment of patellar height.
Original Text by Clifford R. Wheeless, III, MD.
Last updated by Data Trace Staff on Friday, August 31, 2012 1:48 pm