International Journal of Surgery and Surgical Sciences (IJSSS)
Correlation of Tibial Tuberosity - Trochlear Groove Distance with Knee Size in Indian Population
Abstract
Introduction: Tibial tuberosity- trochlear groove (TTTG) distance or the patellar tendon-trochlear groove distance (PTTG) is useful in conditions like patellofemoral instability (PFI). Both TTTG and PTTG are “distances”, and like any distance measurement in the body, theoretically, these distances may depend on the size of the patient. However, there are limited studies assessing this, with conflicting results. The present study was performed to determine if the size of the knee is associated with the TTTG distance and the PTTG distance, as measured on knee MRI.
Methods: It was a cross-sectional study performed on 60 archival MRI films of knee joint, including 20 scans of PFI patients and 40 non-PFI subjects. Trans-epicondylar distance (TED) was measured on axial sections to represent knee size, and the PTTG and TTTG distances were measured using standard methods. Pearson’s correlation coefficients between TED and TTTG distance as well as between TED and PTTG distance were calculated in the two groups separately.
Results: In the PFI patients, the mean TTTG and PTTG distances were 10.5 ±2.5 mm and 13.4 ±2.9 mm respectively. In the non-PFI subjects, the mean TTTG and PTTG distances were 7.0±4.4 mm and 7.8±4.1 mm respectively. In both the groups of subjects, no significant correlation was found between TED and TTTG distance or TED and PTTG distance.
Conclusion: Present study did not find any influence of knee size on the TTTG or PTTG distance, suggesting that the TTTG or PTTG distance can safely be used in treatment protocols without worrying about the potential effect of knee size.
Keywords
References
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