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Reliability almost perfect between surgeons, radiologists in measuring TT-TG distance, TDI
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Recently published data indicated interobserver and intraobserver reliability was nearly perfect when measurements for tibial tubercle-trochlear groove distance and trochlear dysplasia index were taken by either an orthopedic surgeons or a radiologist.
Researchers retrospectively compared MRI data from 63 patients diagnosed with patellar instability with 53 healthy controls. Tibial tubercle–trochlear groove (TT-TG) distance and trochlear dysplasia index (TDI) were determined multiple times on each MRI by five blinded specialists (three radiologists and two orthopedic surgeons) with at least a week of separation between measurements. Intraobserver and interobserver reliability were determined via intraclass correlation coefficient (ICC).
Mean TT-TG distance and TDI were 18.2 mm and 2.1 mm, respectively, for the instability group and 13.7 mm and 4.6 mm, respectively, for the control group. No significant differences in intraobserver or interobserver reliability were observed between radiologists and orthopedic surgeons, according to the researchers. Additionally, intraobserver and interobserver reliability were nearly perfect in measurements of the TT-TG distance, as well as TDI. – by Christian Ingram
Disclosures: Skelley reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.
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