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Lookup NU author(s): Dr Wee Han Lim, Oday Al-Dadah
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© The Author(s), under exclusive licence to Istituto Ortopedico Rizzoli 2025. Purpose: Magnetic resonance imaging (MRI) is often used to evaluate patients with patellar dislocations to facilitate diagnosis and management strategies. Many radiological parameters have been described in the literature. The aim of this study was to assess the significance of tibial-tubercle trochlear groove distance (TT-TG) distance and other MRI measurements in patients with and without patellar instability. Methods: This case-control study included 41 patients with recurrent patellar instability and 50 patients with stable knees, all of whom underwent MRI scans. A total of 19 radiological parameters were measured in both groups. Results: All measured MRI parameters had statistically significant differences between both groups (p < 0.05) apart from trochlear cartilage length. TT-TG distance. 20 mm had the strongest association with patellar instability (OR 53.3, p = 0.006, 95%CI [3.1- 927.4]) and the highest specificity (100%) but had the lowest sensitivity (34%) out of all the measured parameters. TT-TG. 13 mm had a higher sensitivity (68%) but lower specificity (72%) and weaker association with patellar instability (OR 5.5, p < 0.001, 95%CI [2.2. 13.7]). TT-TG/trochlear articular cartilage width ratio also had a strong association with patellar instability (OR 14.7, p < 0.001, 95%CI [4.5. 48.5]) with high specificity (92%) but lower sensitivity (56%). Conclusion: The cut-off values for TT-TG distance at 13 mm and 20 mm both had advantages and disadvantages which supports the concept of using patient-individualised ratios. Patellar instability is associated with many radiological abnormalities demonstrated on MRI scans. Selection of the most appropriate measurement is dependent on the philosophy and preference of the treating clinician.
Author(s): Lim W, Al-Dadah O
Publication type: Article
Publication status: Published
Journal: Musculoskeletal Surgery
Year: 2025
Volume: 109
Pages: 345-356
Print publication date: 01/09/2025
Online publication date: 05/02/2025
Acceptance date: 13/01/2025
ISSN (print): 2035-5106
ISSN (electronic): 2035-5114
Publisher: Springer Nature
URL: https://doi.org/10.1007/s12306-025-00884-y
DOI: 10.1007/s12306-025-00884-y
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