Experience of total knee arthroplasty using a novel navigation system within the surgical field.

Background: With the aim of improving component alignment and outcome in total knee arthroplasty (TKA), several computer-assisted devices (CAD) have been developed.

Methods: In February 2014, the present unit started to use a new imageless navigation system with accelerometric pods within the surgical field for all primary TKAs; there was no need for optical trackers or cameras. This paper presents the results of the first 72 TKAs using this iAssist system in 71 prospectively collected and retrospectively analyzed patients.

Chondrocalcinosis in an isolated suprapatellar pouch with recurrent effusion.

We report the case of a 45-year-old man with a long history of chondrocalcinosis and recurrent painless suprapatellar swelling. Over the 3 months before his admission, the swelling had become persistent and extended 10 cm proximal to the patella on the anterior aspect of the thigh. Magnetic resonance imaging revealed an enlarged suprapatellar pouch that was completely separated from the knee joint cavity by a suprapatellar membrane.