Tibial Tuberosity-Posterior Cruciate Ligament Distance.

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.

Patellofemoral arthroplasty in the athlete.

Patellofemoral arthritis is multifactorial and more prevalent in women and in those with high patellofemoral loading (eg, from athletics and obesity). More patients are presenting with end-stage patellofemoral arthritis at earlier ages, which is increasingly being treated with patellofemoral arthroplasty. However, these patients often desire to continue with some level of sporting activities.