Reports on healing of erosions in rheumatoid arthritis are rare. However, it is expected that repair of erosions should be seen more often during the period of extensive use of disease modifying antirheumatic drugs, especially in patients who experience sustained remission. Two such cases are described.
- rheumatoid arthritis
- disease modifying antirheumatic drugs
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Bone erosions in joints have generally been considered as irreversible end state changes in rheumatoid arthritis (RA). Accordingly, reports on healing of erosions are rare. In the cases described here, joint repair was associated with suppression of inflammation.1-4 During the period of more extensive use of disease modifying antirheumatic drugs (DMARDs), especially during clinical remission, healing of erosions can be expected to be seen more frequently. Here we describe two cases with such a phenomenon.
A 27 year old car mechanic had tenderness in his feet in summer 1991. June 1992 he was admitted to our rheumatology clinic owing to morning stiffness, tenderness, and swelling in the small joints of his hands and feet, which had lasted for four months. Rheumatoid factor was positive, erythrocyte sedimentation rate (ESR) 25 mm/1st h, and C reactive protein (CRP) 8 mg/l. A Larsen grade 25 erosion was seen only in the left fifth metatarsophalangeal (MTP) joint. The disease met the American College of Rheumatology Criteria (ACR-87) for RA.6 DMARD treatment was started with sulfasalazine 2 g daily. Six months later the patient was in clinical remission. In June 1994 he discontinued sulfasalazine because he had no symptoms of RA. Three months later, however, the symptoms returned, and sulfasalazine was restarted.
In April 1995 he was admitted to the clinic with a flare of RA. ESR was 41 mm/1st h and CRP 27 mg/l. Radiographic examination showed erosions in several MTP joints. Intramuscular (IM) gold was added to the sulfasalazine. Nevertheless, his RA remained active.
In February 1996, his ESR was 80 mm/1st h, CRP 62 mg/l, and erosions in the MTP joints had increased. IM gold was replaced by methotrexate 10 mg weekly, and sulfasalazine was continued. During the following months, the weekly dose of methotrexate was increased to 20 mg. During 1997 he went into remission and was still in remission by March 1999, when no tender or swollen joints were found, ESR was 11 mm/1st h, and CRP 5 mg/l. Healing of MTP erosions was recorded (fig 1). The patient has never been treated with systemic or local glucocorticoids.
Palindromic RA7 of a 49 year old woman became chronic in the joints of the hands, feet, and knees in March 1989. She met the ACR-87 criteria for seronegative RA. In June 1989 her ESR was 44 mm/1st h, CRP 46 mg/l, and no erosions in radiographs of the hands and feet were found. Both knees and second to fifth proximal interphalangeal (PIP) joints in both hands were tender and swollen, whereas only tenderness was recorded in both feet. IM gold treatment was started. In three months the patient developed allergic dermatitits, and IM gold was replaced by auranofin. In January 1990 she was in clinical remission with no swollen or tender joints; her ESR was 6 mm/1st h. However, in April 1990 erosions of the PIP joints were seen in plain radiographs. Auranofin was discontinued in August 1993 owing to clinical remission, continuing still in May 1997. The erosive changes in the PIP joints had healed (fig 2). Systemic or local glucocorticoids were not used.
Healing of erosive changes in RA includes formation of new bone, recortication of erosions, and secondary osteoarthrosis.1Healing of erosions is associated with disappearance of inflammation in the joints affected, and with complete clinical remission of RA in most cases. Rau and Herborn described six,1 and McCarty and Carrera nine patients2 who had been treated with IM gold or combinations of DMARDs, while in other patients whose erosions had been repaired, methotrexate or IM gold has been used.3 ,4Controlled clinical trials show that several individual DMARDs,8 or their combinations,9 ,10 slow the progression of erosions in RA in the short term, and some longitudinal observational studies indicate that the use of DMARDs can retard progression of radiographic joint damage in RA also in the long term.8 ,11-13 Preliminary, so far unpublished, reports of the anti-erosive efficacy of biological treatments are also promising.14-16 Until now, however, reports on healing of erosions have been rare (more extensively discussed in reference1). None the less, reports on this phenomenon ought to re-encourage rheumatologists to treat their patients with RA with all available DMARDs to the point of “no evidence of disease”17 rather than to tolerate signs of disease activity.
Longitudinal observations of clinical patients offer a better opportunity to study healing in RA than do short term clinical trials. However, to document healing, patients must be assessed regularly and radiographs taken also during clinical remission. We regard this healing phenomenon as a hopeful sign for the rheumatology community in the fight against RA.