Thessaly's test is used to assess for a meniscal tear in the knee.
Performing the Test
With patient standing, knee flexed to 20°, have them rotate their femur on tibia internally and externally 3 times
Positive: joint line pain, locking, or catching
Sensitivity: ≥89%; specificity: ≥96%
Magee D. Orthopedic Physical Assessment. 1st ed. Philadelphia:Saunders; 1986.