ArticleOrthopaedic journal of sports medicine2026
Overcoming Limitations in Tibial Tubercle-Trochlear Groove Distance Measurement: A Study of Its Reproducibility and Reliability in High-Grade Trochlear Dysplasia.
Article in Orthopaedic journal of sports medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: In cases of high-grade trochlear dysplasia, identifying the reference point of the trochlear groove can be challenging when measuring the tibial tubercle-trochlear groove (TT-TG) distance. Purpose/Hypothesis: The purpose of this study is to evaluate the reliability of TT-TG measurements obtained at different trochlear reference levels. It was hypothesized that TT-TG measurements would remain feasible even in cases of high-grade trochlear dysplasia when alternative trochlear reference levels are used. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A retrospective analysis of magnetic resonance imaging scans from patients presenting with patellar instability between 2019 and 2023 was performed. For each patient, the TT-TG distance was measured at 3 levels on axial magnetic resonance imaging: high ( Results: A total of 136 knees were included, of which 64% presented with high-grade trochlear dysplasia (37 Dejour type B and 50 type D). No statistically significant differences were observed between TT-TG measurements obtained at the 3 reference levels. The Conclusion: TT-TG measurements remained feasible and reproducible in this cohort of patients with patellar instability, including a high proportion of high-grade trochlear dysplasia, when a slightly more distal trochlear reference level was used. TT-PCL remains a potential alternative although its interobserver reliability was lower than that of TT-TG in the present study.
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