The role of PET in a clinically silent and ultrasound negative synovitis in the course of rheumatoid arthritis - a case report.

We present a case report of a rheumatoid arthritis patient, who underwent a PET scan, which revealed inflammation of multiple joints, which was missed by both physical and ultrasound examinations. A 55-year old woman with a long-term rheumatoid arthritis, who had undergone arthroplasty of the left knee in the past, consulted with the rheumatologist for pain in the left knee. The physical examination revealed signs of inflammation in the left knee and right elbow. The inflammatory parameters were high. Ultrasound showed intraarticular effusion without signs of active synovitis in the left knee. The ultrasound assessment of the other joints (hands, wrists and feet) was also negative for active synovitis, while positron-emission tomography (PET) revealed increased glucose metabolism at the level of the medial side of the left knee, left radio-ulno-carpal joint, I-II-III metacarpo-phalangeal joints bilaterally, right II metatarso-phalangeal joint, and left II-III metatarso-phalangeal joints. This case report demonstrates that PET might be more sensitive than ultrasound in detecting subclinical joint inflammation.

Musculoskeletal manifestations as determinants of quality of life impairment in patients with systemic lupus erythematosus.

Objective The objective of this study was to identify determinants of health-related quality of life (HRQoL) impairment in patients with systemic lupus erythematosus (SLE). Methods Overall, 101 SLE patients were recruited; 37 healthy subjects and 35 rheumatoid arthritis (RA) patients served as controls. HRQoL was evaluated using three patient reported outcomes (PROs): the Short Form-36 version 2 (SF-36v2) health survey, the fatigue scale version 4 (FACITv4) and the Heath Assessment Questionnaire (HAQ). A large set of demographic and clinical variables, including SLE arthritis subtypes, was evaluated searching for factors independently associated with worse QoL. Multivariate models were applied to identify factors independently associated with outcomes. Bonferroni's corrected p values < 0.05 were considered significant. Results SLE patients showed worse results than healthy controls ( p < 0.01) in all SF-36v2 domains and, with reference to the mental QoL, also than RA patients ( p < 0.01). Jaccoud's deformities, active arthritis, and fibromyalgia were the only factors independently associated with worse results in both physical and mental components summary of the SF-36v2 ( p < 0.01) and FACITv4 fatigue scale ( p < 0.01). Fragility fractures, deformities, and active arthritis negatively affected disability perception measured by the HAQ ( p < 0.01). No statistically significant differences in perceived HRQoL were highlighted between patients with deforming and erosive arthritis. However, they had significantly worse results than patients with non-deforming non-erosive arthritis across all investigated PROs ( p < 0.01). Conclusion In order to limit musculoskeletal manifestations as a source of impaired QoL in SLE patients, therapeutic strategies targeted to successfully manage active arthritis and fibromyalgia and to prevent deforming damage are needed.