Reliability of the TT-TG Index Versus TT-TG Distance on MRI: Morphometric Analyses in Asian Children and Adolescentsopen access
- Authors
- Park, Sin Hyung; Choi, Wonchul; Yoon, Siyeong; Rhie, Jeongbae; Ahn, Wooyeol; Oh, Jongbeom; Han, Dong Hun; Lee, Soonchul
- Issue Date
- Jun-2023
- Publisher
- SAGE Publications Inc.
- Keywords
- tibial tuberosity; trochlear groove; distance; index; morphometry
- Citation
- Orthopaedic Journal of Sports Medicine, v.11, no.6
- Journal Title
- Orthopaedic Journal of Sports Medicine
- Volume
- 11
- Number
- 6
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/25343
- DOI
- 10.1177/23259671221145228
- ISSN
- 2325-9671
- Abstract
- Background:The tibial tuberosity-trochlear groove (TT-TG) distance measured on magnetic resonance imaging (MRI) is commonly used to decide the treatment for patellar instability; however, the patient's joint size is not considered in this measurement. The TT-TG index has been proposed as a knee size-adjusted measurement for tibial tuberosity location. Purpose:To evaluate the reliability of the TT-TG index compared with the TT-TG distance by analyzing variations in measurement according to age and sex in a pediatric Asian population. Study Design:Cohort study (diagnosis); Level of evidence, 3. Methods:A total of 698 knee MRI scans were collected in patients between 4 and 18 years of age who did not have any patellofemoral problems. Patient age, sex, height, and weight were recorded. The scans were divided into 5 groups according to patient age (4-6 years, 46 scans; 7-9 years, 56 scans; 10-12 years, 122 scans; 13-15 years, 185 scans; and 16-18 years, 289 scans); MRI scans were also divided by sex (497 male, 201 female). Three independent observers measured the TT-TG distance and TT-TG index on each scan, and age- and sex-based differences in the measurements were evaluated after adjusting for body mass index (BMI). The reliability of the measurements was calculated with the intraclass correlation coefficient (ICC). Results:Good to excellent inter- and intraobserver agreement was found for TT-TG distance (ICC, 0.74) and TT-TG index (ICC, 0.88). The TT-TG distance was significantly different among the groups and increased with age, while variations in the TT-TG index were minimal between age groups and sexes. This finding was also consistent after compensating for the effect of BMI. Conclusion:The TT-TG distance changed with age, while the TT-TG index was relatively constant. Therefore, the TT-TG index may be more reliable and effective for diagnosing and planning treatment, especially in children and adolescents.
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Collections - College of Medicine > Department of Orthopedic Surgery > 1. Journal Articles
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