Adolescent patellar instability: current concepts review.

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Abstract

[Indexed for MEDLINE] 20. Curr Rev Musculoskelet Med. 2018 Jun;11(2):261-265. doi: 10.1007/s12178-018-9481-4. Use of TT-PCL versus TT-TG. Brady JM(1), Rosencrans AS(2), Shubin Stein BE(3). Author information: (1)Oregon Health and Science University, 3181 SW Sam Jackson Park Rd., Mail code OP 31, Portland, OR, 97239, USA. munch@ohsu.edu. (2)Oregon Health and Science University, 3181 SW Sam Jackson Park Rd., Mail code OP 31, Portland, OR, 97239, USA. (3)Hospital for Special Surgery, 535 E 70th St, New York, NY, 10021, USA. PURPOSE OF REVIEW: The tibial tubercle-to-trochlear groove (TT-TG) distance and tibial tubercle-to-posterior cruciate ligament (TT-PCL) distance have both been proposed for use in the evaluation of patients with patellofemoral instability. RECENT FINDINGS: While the TT-TG value may be confounded by several factors, including age, gender, body mass index, and varying degrees of knee flexion on cross-sectional imaging, recent literature supports its utility for differentiation of patients with and without patellofemoral instability, and stratification of patients with and without coronal malalignment. The TT-PCL describes pure lateralization of the tibial tubercle, and may be used in conjunction with the TT-TG to better understand the path taken by the extensor mechanism of the knee joint. The TT-TG measurement is superior to the TT-PCL measurement for differentiating patients with patellofemoral instability from their stable counterparts, though TT-PCL may be useful in conjunction with TT-TG for better understanding the path of the extensor mechanism across the knee joint. DOI: 10.1007/s12178-018-9481-4 PMCID: PMC5970116