The J-sign is when the kneecap subluxes laterally each time the knee moves into terminal extension.
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CLINICAL PUBLICATIONS
Q-angle and J-sign: Indicative of Maltracking Subgroups in Patellofemoral Pain. Sheehan FT, Derasari A, Fine KM, Brindle TJ and Katharine E. Alter KE. Clin Orthop Relat Res. 2010 Jan; 468(1): 266–275.
Clinical Accuracy of J-Sign Measurement Compared to Magnetic Resonance Imaging. Beckert MW, Albright JC, Zavala J, Chang J and Albright JP. Iowa Orthop J. 2016; 36: 94–97.
See also -
- Patellar instability
- Patella alta
- Patellar brace
- Patellar dislocation
- Patellar subluxation
- Trochlear dysplasia
- TT-TG Distance
