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Calcium Pyrophosphate Dihydrate and Hydroxyapatite Crystals in a Patient with Rheumatoid Arthritis: a Case Report Shereen R

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Calcium Pyrophosphate Dihydrate and Hydroxyapatite Crystals in a Patient with Rheumatoid Arthritis: a Case Report Shereen R Case report 91 Calcium pyrophosphate dihydrate and hydroxyapatite crystals in a patient with rheumatoid arthritis: a case report Shereen R. Kamel Department of Rheumatology and The association between rheumatoid arthritis (RA) and calcium pyrophosphate Rehabilitation, Minia University, Egypt dihydrate (CPPD) crystal deposits can now be easily identified by MSUS, which is a Correspondence to Shereen R Kamel, MD, noninvasive technique that can be applied to patients with painful joints and Department of Rheumatology and enthesis that are unexplained by rheumatoid activity. In this paper, we report an Rehabilitation, Minia University, Minia 6111, Egyptian case of a 51-year-old man who had rheumatoid arthritis since 7 years and Egypt ’ Tel: +20 106 580 0025; developed bilateral knee and heel pain of 1.5 months duration with gradual onset e-mail: [email protected] and progressive course. Radiography revealed features of RA in both hands, as well as features of severe osteoarthritis in both knees with no signs of Received 2 October 2016 Accepted 7 February 2017 chondrocalcinosis. Ultrasonography of the joints, Achilles tendon, and plantar fascia detected knee, Achilles tendon, and plantar fascia calcifications, which Egyptian Rheumatology & Rehabilitation 2017, 44:91–94 are characteristic of CPPD, and supraspinatus calcification, which is characteristic of hydroxyapatite (HA) deposition. Further investigations revealed no evidence of metabolic disorders. CPPD and HA crystals were identified in his synovial fluid. Subclinical affection with CPPD and HA crystals in RA can be easily detected by ultrasonography, which allows early management to prevent future attacks in RA patients that could lead to exacerbation of joint symptoms that may be missed as rheumatoid disease activity. Diet control and colchicine treatment may be more effective if started early before exacerbation. Keywords: calcium pyrophosphate dihydrate deposition, hydroxyapatite deposition, rheumatoid arthritis Egypt Rheumatol Rehabil 44:91–94 © 2017 Egyptian Society for Rheumatology and Rehabilitation 1110-161X years earlier. The patient fulfilled the 2010 ACR/ Introduction EULAR criteria for RA. The patient was on Calcium pyrophosphate dihydrate crystal deposition methotrexate, antimalarial, and NSAIDs for RA. He disease (CPPD) and hydroxyapatite (HA) CPPD had shown a good response to treatment in the previous are characterized by deposition of insoluble crystals years, but had been off treatment since 2 months. within the joints and periarticular soft tissues, initiating Physical examination confirmed arthritis in both inflammatory destructive reaction [1]. knees, plantar fasciitis, and Achilles tendinitis, in addition to symmetrical polyarthritis of the second Association between rheumatoid arthritis (RA) and and third proximal interphalangeal joints (PIPs) calcium pyrophosphate dihydrate (CPPD) crystal and metacarpophalangeal joints (MCPs) in both deposits is more frequent than previously believed hands, wrists, and elbows. Initial workup showed [2]. Gerster et al. [2] reported that CPPD crystals thrombocytosis, elevated erythrocyte sedimentation were present in 25.8% of RA patients and that a worse rate (95 mm/h), elevated level of C-reactive protein, clinical outcome was associated with the presence of positive rheumatoid factor, positive anticyclic these crystals. These observations support the notion citrullinated peptide, normal uric acid level, and that tissue injury caused by arthritis leads to crystal normal liver and kidney functions. Plain radiographs formation and that crystals may worsen the primary showed juxta-articular cysts at PIPs, subchondral cysts at arthritis. the second and third MCPs, multiple cysts at the carpal bones, narrowing of both radiocarpal joint space with In this paper, we report the case of an Egyptian male subchondral cysts, multiple cysts and erosions at the patient with RA with CPPD and HA crystals in his ulnar styloid processes, and narrowing of the medial synovial fluid. A short review of the literature is also side of both tibiofemoral joint space with subchondral presented. cysts. Subsequent workup showed normal parathyroid Case history A 51-year-old male patient complained of gradually This is an open access article distributed under the terms of the Creative ’ Commons Attribution-NonCommercial-ShareAlike 3.0 License, which progressing bilateral knee and heel pain of 1.5 months allows others to remix, tweak, and build upon the work duration. Patient consent was obtained. His medical noncommercially, as long as the author is credited and the new history was significant for RA, which was diagnosed 7 creations are licensed under the identical terms. © 2017 Egyptian Rheumatology & Rehabilitation | Published by Wolters Kluwer - Medknow DOI: 10.4103/1110-161X.205662 92 Egyptian Rheumatology & Rehabilitation, Vol. 44 No. 2, April-June 2017 hormone, normal calcium and phosphorous levels, and rhomboidal crystals) using polarized light microscopy normal magnesium and alkaline phosphatase. and hydroxyapatite crystals (nonbirefringent), which were identified with routine light microscopy and Ultrasonographic examination of the joints, Achilles staining of the fluid with alizarin red S. tendon, and plantar fascia revealed knee calcification [several thin hyperechoic spots (punctate pattern)] Aspiration of the knee joint followed by an intra- at the fibrous cartilage, Achilles tendon calcification articular steroid injection was performed, and low- (hyperechoic deposits within the fibrillar tendon dose oral colchicine (0.6 mg twice a day) was added structure not in continuity with the bone profile) of to the previous treatment. pattern I (multiple thin linear bands) (Fig. 1), and plantar fascia calcification (hyperechoic deposits in the Discussion superficial region of the insertional tract of the fascia, not RA is a chronic inflammatory disease determined by an in continuity with the bone profile) of pattern I (multiple inflammation of the synovial membrane leading to thin linear bands) (Fig. 2) – which are characteristic of destruction of cartilage and bone [3]. CPPD – and supraspinatus calcification (hyperechoic appearance) (Fig. 3) – which is characteristic of CPPD disease is confirmed as equally common in RA hydroxyapatite deposition. by synovial fluid and macroscopic skeletal examination [4]. Macrosopic examination of synovial fluid showed that synovial fluid viscosity was normal, aspect was clear, and The clinical features that should alert one to the likelihood its colorwas yellow.Microscopicexaminationofsynovial of CPPD arthropathy include the following: an unusually fluid was performed for identification of crystals and severe or destructive arthropathy, a history of other joint showed both CPPD (weakly positive birefringent involvement or of a previous joint operation, clinical Figure 1 evidence or a history of a disorder known to be associated with CPPD, and a family history of joint disease. There may also be evidence of chondrocalcinosis or other distinctive radiological signs of CPPD [5]. Doherty et al. [6] reported that when RA and CPPD coexist, atypical radiographic features reflecting a hypertrophic reparative response may occur. Our patient was an elderly man who had had RA since 7 years and developed bilateral knee and heel pain of 1.5 Longitudinal scan of Achilles tendon showing Achilles tendon calcifi- months’ duration with gradual onset and progressive cation (arrow) course. Physical examination revealed polyarticular Figure 3 Figure 2 Transverse scan of the right supraspinatus muscle showing supra- Longitudinal scan of plantar fascia showing plantar calcification spinatus calcification (arrow) characteristic of hydroxyapatite depo- (arrow) sition CPPD and HA crystals in RA Kamel 93 involvement of the knees, second and third PIPs, and CPDD is associated with age, trauma, osteoarthritis, and MCPs of both hands, wrists, and elbows, in addition some metabolic diseases such as hyperparathyroidism, to bilateral plantar fasciitis and Achilles tendinitis. hypomagnesemia, gout, hemochromatosis, hypo- Radiography revealed features of RA in both hands thyroidism, and hypophosphatasia [14]. Our patient and features of severe osteoarthritis in both knees with was old and had RA in addition to knee osteoarthritis, no signs of chondrocalcinosis. US of the joints, Achilles but had no evidence of metabolic disorders. tendon, and plantar fascia revealed knee, Achilles tendon, Thus, the tissue injury caused by arthritis can induce and plantar fascia calcifications−characteristic of CPPD − crystal formation as reported by Sun and Hanley and supraspinatus calcification − characteristic of [15]. hydroxyapatite deposition. Ultrasonography (US) is an emerging technique that Conclusion could be used for detection of the CPPD deposits CPPD and HA crystals could be detected in patients (hyperechoic deposits), particularly those that are too with RA. US is a useful indirect sign for the presence of small to be visible on plain radiographs [7]. CPPD and HA crystal deposition diseases, with the importance of searching for calcification both in In our case, plain radiography did not show any articular and periarticular tissues. US could allow calcifications either in Achillles tendon or in the early management of these cases to prevent future plantar fascia; however, the calcific structure of the attacks in RA patients that could lead to deposits was observed by US. This could be due to low exacerbation of joint symptoms that may be missed
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