Juliana Constantino Campos MD, Presenter: Nothing to Disclose

Brady Kirk Huang MD, Abstract Co-Author: Nothing to Disclose

Christine Chung BA, Abstract Co-Author: Nothing to Disclose

Mini Nutan Pathria MD, Abstract Co-Author: Nothing to Disclose

Hydroxyapatite crystal deposition disease (HADD) typically involves periarticular soft tissues,particularly tendons and ligaments.The shoulder is the most commonly involved and studied site.There are few descriptions of symptomatic HADD at the knee.The aim of the study is to describe the clinical and imaging findings of symptomatic HADD of the medial collateral ligament (MCL).

Physiopathology of periarticular HADD. Clinical and imaging findings in patients with symptomatic HADD in the MCL. Differential diagnosis of medial knee pain/calcification.

We present 18 patients with acute medial knee pain and calcification about the MCL.2 patients had minor trauma,the remaining had no injury history.In all cases,calcific deposits were located at or near the femoral attachment of an otherwise intact MCL.The deposits had variable appearance on radiographs and consisted of lobulated low signal intensity foci on MR,associated with surrounding inflammatory changes.Interval change in the character of calcification was documented in 4 cases.HADD is an uncommon cause for intense medial knee pain.Imaging findings overlap those seen in Pellegrini-Stieda,but the absence of trauma and acute symptoms are typical of active HADD.Increased awareness of active inflammatory HADD helps to guide appropriate therapy in patients with acute medial knee pain.

Campos, J, Huang, B, Chung, C, Pathria, M, Hydroxyapatite Crystal Deposition Disease of the Medial Collateral Ligament of the Knee .  Radiological Society of North America 2012 Scientific Assembly and Annual Meeting, November 25 - November 30, 2012 ,Chicago IL. http://archive.rsna.org/2012/12030773.html