Presentation
Polyarthralgia. Negative trauma. There is no significant past medical history.
Patient Data
There are degenerative changes in the left knee with medial and lateral meniscal chondrocalcinosis. The patellofemoral joint space narrowing is disproportionate to the femorotibial joint space narrowing degree. There is mild scalloping of the anterior femoral cortex. There are thin, linear, calcifications within the proximal gastrocnemius tendon.
There is diffuse bony osteopenia and a suprapatellar effusion.
Case Discussion
Features of calcium pyrophosphate dihydrate deposition disease (CPPD) in the left knee.
Typical findings suggestive of the diagnosis:
chondrocalcinosis involving both the medial and lateral menisci and hyaline cartilage
predominant patellofemoral osteoarthritis
anterior femoral cortical scalloping
proximal gastrocnemius tendon calcifications.
Chondrocalcinosis in the knee is more common in the lateral than the medial compartments1.
The Achilles, quadriceps and gastrocnemius tendons account for most tendon calcifications in CPPD while the rotator cuff, proximal and distal triceps tendons are the least involved1.
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