Magnetic resonance imaging and miniarthroscopy of metacarpophalangeal joints: Sensitive detection of morphologic changes in rheumatoid arthritis

387

226

Objective. Magnetic resonance imaging (MRI) is capable of revealing synovitis and tendinitis in early rheumatoid arthritis (RA), as well as bone edema and erosion. These features are visible before radiographic joint damage occurs. We sought to examine whether MRI of one body region (the wrist) can be used to predict whole-body radiography scores reflecting joint damage at 6 years.Methods. We conducted a 6-year prospective study of a cohort of patients who fulfilled the criteria for RA at presentation, using clinical parameters, radiographs, and MRI scans of the dominant wrist. Of the 42 patients enrolled at baseline, full MRI, radiographic, and clinical data were available for 31 at 6-year followup. MRI scans were scored by 2 radiologists, using a validated scoring system. Radiographs of the hands and feet were graded using the modified Sharp scoring method. MRI and radiography scores obtained at baseline and 6 years were compared, and baseline MRI scores were examined for their ability to predict radiographic outcome at 6 years.Results. At 6 years, the total Sharp score correlated significantly with the total MRI score and the MRI erosion score (r ‫؍‬ 0.81, P < 0.0001 and r ‫؍‬ 0.79, P < 0.0001, respectively). The 6-year Sharp score also correlated with the baseline total MRI and MRI erosion scores (r ‫؍‬ 0.56, P < 0.0001 and r ‫؍‬ 0.33, P ‫؍‬ 0.03, respectively). MRI synovitis and bone edema scores remained constant for the group as a whole over 6 years, but bone erosion scores progressed (P ‫؍‬ 0.0001), consistent with radiographic deterioration. Erosions on 6-year MRI scans were frequently preceded by MRI bone edema at baseline (odds ratio 6.5, 95% confidence interval 2.78-18.1). Regression models indicated that the baseline MRI bone edema score was predictive of the 6-year total Sharp score (P ‫؍‬ 0.01), as was the C-reactive protein (CRP) level (P ‫؍‬ 0.0002). Neither shared epitope status nor swollen or tender joint counts predicted radiographic outcome in this cohort. A model incorporating baseline MRI scores for erosion, bone edema, synovitis, and tendinitis plus the CRP level and the erythrocyte sedimentation rate explained 59% of the variance in the 6-year total Sharp score (R 2 ‫؍‬ 0.59, adjusted R 2 ‫؍‬ 0.44). Conclusion. MRI scans performed at the first presentation of RA can be used to help predict future radiographic damage, allowing disease-modifying therapy to be targeted to patients with aggressive disease.

Section: Discussionmentioning

confidence: 99%

Bone edema scored on magnetic resonance imaging scans of the dominant carpus at presentation predicts radiographic joint damage of the hands and feet six years later in patients with rheumatoid arthritis

McQueen¹,

Benton²,

Perry³

et al. 2003

387

226

“…Relevant research topics include examination of the occurrence of MRI bone erosions in other diseases and in healthy controls, development and validation of evaluation systems, and comparison with reliable references (e.g., histopathology, miniarthroscopy, and computed tomography). Although preliminary data obtained by ultrasonography-guided biopsies (15) and miniarthroscopy (16) indicated that MRI erosions represent true bone damage, more data are warranted. Large followup studies are needed to confirm the prognostic value of MRI bone erosions in early RA and in early persistent polyarthritis.…”

Section: Discussionmentioning

confidence: 99%

New radiographic bone erosions in the wrists of patients with rheumatoid arthritis are detectable with magnetic resonance imaging a median of two years earlier

Østergaard¹,

Hansen²,

Stoltenberg³

et al. 2003

169

Objective. In a 5-year followup study, we investigated the temporal relationship between development of wrist joint erosions as visualized by magnetic resonance imaging (MRI) versus conventional radiography (CR), in patients with rheumatoid arthritis. We also evaluated the risk of erosive progression on CR associated with the presence of MRI erosions.Methods. In 10 patients with rheumatoid arthritis, MRI and CR of the dominant wrist were performed annually for 5 years. In each image set, each wrist bone (metacarpal bases, carpal bones, radius, and ulna) was assessed for the absence or presence of bone erosions.Results. Nine bones showed radiographic erosions at baseline. Twenty-seven new radiographic erosions developed during the 5-year followup period. Of these 27 new erosions, 21 were detected 1-5 years earlier by MRI than by CR, 3 were simultaneously detected by both methods, 2 were detected 1-2 years later by MRI than by CR, and 1 erosion (radiographically detected at 5-year followup) was not visualized with MRI. MRI detection of new radiographic erosions preceded CR detection by a median of 2 years. In bones with MRI erosions at baseline, the relative risk of radiographic erosions at 5-year followup was 4.5 (95% confidence interval [95% CI] 2.6-7.6), compared with bones without baseline MRI erosions. If bones with baseline radiographic erosions were excluded from the analysis, the relative risk was 4.1 (95% CI 2.2-7.5).Conclusion. Most new radiographic bone erosions (78%) were visualized at least 1 year earlier by MRI than by CR. This illustrates that the information on joint destruction provided by CR is considerably delayed compared with that provided by MRI. A significantly increased risk of progression of radiographic erosion in bones with baseline MRI erosions was observed, demonstrating a prognostic value of MRI with respect to long-term radiographic outcome.

“…In all patients, 3 serial arthroscopically guided synovial biopsies of the same index joint, at baseline, after 4 weeks of treatment, and at the end of the treatment period at 12 weeks were performed under local anesthesia (29). The joints subjected to the arthroscopic biopsy procedure were the knee joint (n ϭ 7), wrist joint (n ϭ 2), ankle joint (n ϭ 1), and MCP joint (n ϭ 1) (30,31).…”

Section: Methodsmentioning

confidence: 99%

Alefacept treatment in psoriatic arthritis: Reduction of the effector T cell population in peripheral blood and synovial tissue is associated with improvement of clinical signs of arthritis

Kraan

Kuijk

Dinant

et al. 2002

135

Objective. To investigate whether alefacept (a fully human lymphocyte function-associated antigen 3 [LFA-3]/IgG1 fusion protein that blocks the LFA-3/CD2 interaction) is able to reduce the signs and symptoms of joint inflammation in patients with active psoriatic arthritis (PsA).Methods. Eleven patients with active PsA were treated with alefacept for 12 weeks in an open-label and explorative study. Clinical joint assessment and laboratory assessments were performed at baseline and after 4, 9, 12, and 16 weeks of treatment. Serial synovial tissue (ST) biopsy specimens from an inflamed index joint (knee, ankle, wrist, or metacarpophalangeal joint) were obtained by arthroscopy at baseline and after 4 and 12 weeks of treatment.Results. At the completion of treatment, 6 of 11 patients (55%) fulfilled the Disease Activity Score (DAS) response criteria. Nine patients (82%) fulfilled the DAS response criteria at any point during the study. There was a statistically significant reduction in CD4؉ lymphocytes (P < 0.05), CD8؉ lymphocytes (P ‫؍‬ 0.05), and CD68؉ macrophages (P < 0.02) in the ST after 12 weeks of treatment compared with baseline. The ST and peripheral blood of those patients fulfilling the DAS response criteria contained more CD45RO؉ cells at baseline and displayed a significant reduction in these cells compared with nonresponding patients.Conclusion. The changes in ST, together with the improvement in clinical joint scores, after treatment with alefacept support the hypothesis that T cell activation plays an important role in this chronic inflammatory disease. Furthermore, since alefacept, a T cellspecific agent, led to decreased macrophage infiltration, the data indicate that T cells are highly involved in synovial inflammation in PsA.