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C-0199 - The clinical J-sign, trochlear dysplasia and the tibial tuberosity-trochlear groove (TT-TG) distance

D. Nizić1, M. Pervan2, M. Simunovic1, M. Jelić1, M. Rados1; 1 Zagreb/HR 2 ZAGREB/HR Type: Scientific Exhibit
Area of Interests: Musculoskeletal system, Extremities, Bones
Imaging Technique: CT
Procedure: Diagnostic procedure
Special Focus: Athletic injuries
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Aims and objectives: A severe lateral subluxation of the patella at active terminal extension of the knee is called the J-sign [1, 2] or J-tracking [3]. It is a straightforward clinical sign, sometimes shortly referred to as “dislocation in extension” [4]. A positive J-sign might suggest patellar maltracking [5], and po[...]

Methods and materials: After obtaining approval from the institutional review board (class: 8.1-16/47-2, Nr.: 02/21 AG, April 11, 2016), in our retrospective cross-sectional review study (Fig. 1), 2 raters mutually assessed the type of trochlear dysplasia (Fig. 2) and separately measured the TT-TG distance at 4-week inter[...]

Results: No significant association was detected when the clinical record of J-sign was compared to various variables, such as age (P=.127), sex (P=.329), laterality (P=.383), presence of trochlear dysplasia (P=.999) and severe trochlear dysplasia (P=.651), or TT-TG values obtained by both methods, whether n[...]

Conclusion: Our data failed to corroborate the diagnostic relationship of the J-sign with the most prominent indicators of patellofemoral instability—trochlear dysplasia and the TT-TG distance. The clinical manifestation of the J-sign, considered a dynamic marker of patellofemoral instability [11], has been f[...]

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References: 1. Callaghan JJ, Rosenberg AG, Rubash HE, Simonian PT, Wickiewicz TL (eds). The adult knee. Volume I. Philadelphia, PA: Lippincott Williams & Wilkins, 2003; 330. 2. Luhmann SJ, Schoenecker PL, Dobbs MB, Eric Gordon J. Adolescent patellofemoral pain: implicating the medial patellofemoral ligame[...]

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