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DOI: 10.1055/s-0035-1564732
Tibial Tuberosity—Posterior Cruciate Ligament Distance
Publication History
10 July 2015
26 August 2015
Publication Date:
28 October 2015 (online)
![](https://www.thieme-connect.de/media/jks/201606/lookinside/thumbnails/10-1055-s-0035-1564732_150061oa-1.jpg)
Abstract
When trochlear dysplasia is present, it is difficult to measure the tibial tuberosity to trochlear groove (TT–TG) distance. A new measurement to assess tuberosity position was recently described by Seitlinger et al, which avoids the difficulty of identifying the TG as it references the posterior cruciate ligament (PCL). To evaluate the reproducibility of the Seitlinger et al findings, 42 knees in 41 patients with a documented history of recurrent patellar instability and 84 knees in patients with no history of patellar instability or patellofemoral symptoms were evaluated with magnetic resonance imaging. The TT–PCL distance was increased in the instability group (mean, 21.6 mm) compared with the control group (mean, 19.0 mm). The TT–PCL distance is an independent risk factor for patients with recurrent patellar instability. Its role in surgical planning remains to be determined.
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