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Tibial tuberosity-trochlear groove distance higher on unstable knee
Recently published results revealed higher lateral patellar tilt, bisect offset and tibial tuberosity-trochlear groove distance on the unstable side in patients with unilateral patellar instability.
Researchers identified 25 patients with a history of recurrent unilateral patellofemoral instability through a review of dynamic CT scans performed from 2008 to 2013. Researchers noted patients performed active knee extension against gravity during the scans with both knees imaged simultaneously. Researchers measured lateral patellar tilt and bisect offset to assess tracking and tibial tuberosity-trochlear groove (TT-TG) to assess alignment in full extension, maximum flexion and in approximately 10° increments.
Andrew J. Cosgarea
Results showed lateral patellar tilt, bisect offset and TT-TG distance were highest in extension, but decreased with flexion. Compared with asymptomatic knees, symptomatic knees had higher measurements, according to researchers, with significant differences identified at 5° and 15° for lateral patellar tilt, bisect offset and TT-TG distance. Tibial tuberosity-trochlear groove distance also showed significant differences at 25° and 35°, according to results. Researchers found an association between TT-TG distance and lateral patellar tilt and bisect offset. – by Casey Tingle
Disclosures: Williams reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.