title: Crystal-induced arthritis after arthroplasty: 7 cases.
abstract: OBJECTIVE
  To describe the occurrence in prosthetic joints of crystal-induced arthritis (CIA) defined as the deposition within the synovial membrane and/or joint cavity of calcium pyrophosphate dehydrate (CPPD) (chondrocalcinosis), sodium urate (gout), or hydroxyapatite.
  
  
  METHODS
  We retrospectively reviewed the 7 cases of prosthetic-joint CIA seen between 1993 and 2013 at a medical-surgical center specialized in the management of osteoarticular infections.
  
  
  RESULTS
  The 4 females and 3 males ranged in age from 67 to 79 years. Acute CIA occurred at the knee in 6 patients (5 with total knee arthroplasty and 1 with unicompartmental knee arthroplasty) and at the hip in 1 patient (with total hip arthroplasty). Time from arthroplasty to CIA varied from 7 days to 9 years. An abrupt onset was a consistent feature, with pain, complete loss of function, and local evidence of inflammation. A single patient had a fever and 6 patients had laboratory evidence of systemic inflammation. Joint aspiration showed hemarthrosis in 3 patients and inflammatory joint fluid with 20,000 to 79,000neutrophils/mm(3) in 6 patients. Joint fluid cultures were negative in 6 patients. CPPD crystals were evidenced in 5 patients, including 1 who also had hydroxyapatite crystals detected by electron microscopy after alizarin red staining. Monosodium urate crystals were found in 1 patient. The remaining patient had both CPPD crystals and positive cultures for Campylobacter fetus. In 5 patients, treatment with colchicine or a nonsteroidal antiinflammatory drug ensured prompt control of the symptoms and systemic inflammation. The patient with total hip arthroplasty underwent joint aspiration for hemarthrosis. In 1 patient, an intraarticular injection of triamcinolone hexacetonide improved the symptoms and systemic inflammation. The patient with Campylobacter fetus infection was treated with antibiotics, excision of the abscess, and synovectomy.
  
  
  CONCLUSIONS
  CIA may occur after arthroplasty, within synovial membrane remains or neosynovium developed around the prosthetic joint. CIA is a manifestation of a metabolic disease that persists and can reactivate after surgery. Routine testing for crystals is rarely performed in patients with sterile arthritis of a prosthetic joint, and crystals are difficult to detect in joints with hemarthrosis; consequently, the frequency of prosthetic-joint CIA may be underestimated. Although rare, CIA should be considered routinely when symptoms suggesting septic arthritis develop in a prosthetic joint, in order to avoid unnecessary prolonged antibiotic therapy and, in some cases, surgery. The treatment is usually simple.
authors.affiliation: Service de rhumatologie, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125, rue d'Avron, 75020 Paris, France.
authors.forename: Salim Ahmed
authors.initials: SA
authors.lastname: Yahia
authors.affiliation: Service de rhumatologie, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125, rue d'Avron, 75020 Paris, France; Service de chirurgie osseuse et traumatologique, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125, rue d'Avron, 75020 Paris, France; Centre de référence des infections ostéoarticulaires complexes, groupe hospitalier Diaconesses-Croix Saint Simon, 125, rue d'Avron, 75020 Paris, France.
authors.forename: Valérie
authors.initials: V
authors.lastname: Zeller
authors.affiliation: Service de biologie médicale, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125 rue d'Avron, 75020 Paris, France; Centre de référence des infections ostéoarticulaires complexes, groupe hospitalier Diaconesses-Croix Saint Simon, 125, rue d'Avron, 75020 Paris, France.
authors.forename: Nicole
authors.initials: N
authors.lastname: Desplaces
authors.affiliation: Service de rhumatologie, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125, rue d'Avron, 75020 Paris, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Chazerain
authors.affiliation: Service de chirurgie osseuse et traumatologique, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125, rue d'Avron, 75020 Paris, France; Centre de référence des infections ostéoarticulaires complexes, groupe hospitalier Diaconesses-Croix Saint Simon, 125, rue d'Avron, 75020 Paris, France.
authors.forename: Luc
authors.initials: L
authors.lastname: Lhotellier
authors.affiliation: Service de chirurgie osseuse et traumatologique, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125, rue d'Avron, 75020 Paris, France; Centre de référence des infections ostéoarticulaires complexes, groupe hospitalier Diaconesses-Croix Saint Simon, 125, rue d'Avron, 75020 Paris, France.
authors.forename: Simon
authors.initials: S
authors.lastname: Marmor
authors.affiliation: Service de rhumatologie, groupe hospitalier Diaconesses-Croix-Saint-Simon, 125, rue d'Avron, 75020 Paris, France; Centre de référence des infections ostéoarticulaires complexes, groupe hospitalier Diaconesses-Croix Saint Simon, 125, rue d'Avron, 75020 Paris, France. Electronic address: jmziza@hopital-dcss.org.
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Ziza
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D000070657:Crystal Arthropathies / Q000175:diagnosis / Q000209:etiology*; D005260:Female; D006621:Hip Joint; D006801:Humans; D007595:Joint Prosthesis / Q000009:adverse effects*; D007719:Knee Joint; D008297:Male; D012189:Retrospective Studies
keywords: Calcium pyrophosphate deposition disease; Chondrocalcinosis; Gout; Joint prosthesis; Prosthetic joint infection