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Tibial tubercle-trochlear groove patellar, trochlear width predicted recurrent instability in knees
Recently published results showed tibial tubercle-trochlear groove patellar width and tibial tubercle-trochlear groove trochlear width was a more effective predictor of recurrent instability compared with use of the tibial tubercle-trochlear groove distance alone.
Researchers calculated the tibial tubercle-trochlear groove (TT-TG) distance, TT-posterior cruciate ligament distance, sagittal patellar length, sagittal trochlear length, axial patellar width and axial trochlear width from the MRI scans of 59 knees with patellar instability. Patients were categorized as those with either a single dislocation or those with multiple dislocations, according to researchers.
Aaron J. Krych
Overall, results showed 20% of knees had a single dislocations and 80% had multiple dislocations. According to results, a TT-TG distance of 20 mm or more was predictive of recurrent instability and had a sensitivity of 21% and a specificity and positive predictive value of 100%. Although the odds ratio for TT-TG distance of 20 mm or greater was 5.38, researchers found the highest odds ratios for recurrent instability for a TT-TG patellar width of 0.4 mm or greater and a TT-TG trochlear width of 0.5 mm or greater. Results showed a TT-TG patellar width of 0.4 mm or greater had a sensitivity of 62%, a specificity of 83% and a positive predictive value of 94%, and a TT-TG trochlear width 0.5 mm or greater had a sensitivity of 45%, a specificity of 92% and a positive predictive value of 95%. – by Casey Tingle
Disclosure: Camp reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.