Magnetic resonance imaging assessment of tibial tuberosity–trochlear groove distance: normal values for males and females

Abstract

The normal TTTG distance is 10 ± 1 mm with MRI being a reliable method of measurement. Literature supports a high degree of variability in reporting TTTG. This study establishes normal TTTG values, which will help in the assessment and treatment of patellofemoral disorders.

Management of traumatic patellar dislocation in a regional hospital in Hong Kong

“…25 The cut-off point of 20 mm above which tibial tubercle osteotomy is indicated has been well accepted by most orthopaedic surgeons. [26][27][28][29][30] One study has shown that 18% of recurrent patellar dislocators had TT-TG distances of >20 mm. 31 For patients with significant trochlear dysplasia, trochleoplasty procedures have been advocated.…”

Are metric parameters sufficient alone in evaluation of the patellar instability? New angular measuring parameters

“…If the threshold value is taken as 20 mm in general, even with the same measurement techniques, different values of TT-TG have been given in literature as the threshold value of instability. 2,12,21 In a study by Park et al 21 of patients with patellar dislocation, the mean TT-TG distance was found to be 13 mm. Although this value was found to be statistically significantly higher than that of the group without instability in that study, it was reported to be a much lower value than that of previous studies.…”

“…3,4,11,12,15,16 Despite its extensive use, in cases where the TT-TG distance is <20 mm, it may not be able to explain other cases seen to have instability. 17,18 In the current study, it was attempted to answer the following questions: (1) Are metric parameters alone sufficient in the evaluation of patellar instability?…”

“…2,5,[8][9][10] The decision for distal alignment surgery is currently made on the criteria of an increased tuberositas tibia-trochlear groove (TT-TG) distance measured in the computed tomography (CT) and magnetic resonance imaging (MRI) evaluation. 2,3,5,[11][12][13] Here, there is a significant problem of the anatomic landmarks to be used in the measurement of this distance, for which, to date, various measurement methods have been proposed. 11,14 Another significant problem is the limit value of the distance and standardization.…”

Plastik des medialen patellofemoralen Ligaments

“…Einen großen Einfluss auf das Patellatracking hat die TT-TG-Distanz, die physiologischerweise bei 10-15 mm liegt [23,27]. Eine TT-TG-Distanz von Eine Überkorrektur der TT-TG-Distanz auf neutrale oder sogar negative Werte führt im mittel-bis langfristigen Verlauf zu erheblichen retropatellaren Knorpelschäden [20] und ist zu vermeiden [11,27].…”