Comparison of standard radiography and magnetic resonance imaging in hand osteoarthritis

Standard radiography in direct projection is the “gold standard” in the diagnosis of hand osteoarthritis (HOA). However, the currently clinically most severe “erosive” or “inflammatory” phenotype of HOA is characterized by the presence of inflammatory symptoms such as bone marrow lession (BML), synovitis and tenosinovitis, which are not visible on the radiograph by the nature of the study due to the low optical density. In addition, X-ray examination is planar and has no possibility of multiplanar visualization. This dictated the need to search for a more informative visualization technique in HOA.

Aim – to compare the sensitivity and specificity of standard radiography and magnetic resonance imaging (MRI) techniques in determining the symptoms of osteoarthritis (OA) of the distal interphalangeal (DIP), proximal interphalangeal (PIP) and metacarpophalangeal (MCP) joints of the right hand; to determine the indications for the appointment of MRI in patients with HOA.

Materials and methods. The study included 64 women with clinically verified diagnosis of HOA according to ask criteria. For the first time, X-rays of the joints of the right hand in the anterior-posterior projection and MRI were performed for each of them. Each patient completed the AUSCAN questionnaire. X-rays were described according to the Kellgren and Lawrence systems, magnetic resonance imaging was analyzed according to the modified OHOA system. The sensitivity and specificity of the methods were compared based on the detection of 4 symptoms detected by radiography and MRI: joint space narrowing (JSN), osteophytes (OP), erosions and subluxations. The average age of the patients was 65.28±6.82 years, the age of onset was 48.81±7.73 years, the duration of the disease was 15.0 (10.0–19.5) years.

Results. Both methods showed approximately equal identification JSN symptom in DIP and PIP, 95% definition JSN in MCP. OP were detected in 88% of patients in DIP according to radiography and in 95% – using MRI (p>0.05). In PIP OP were observed in 70% of patients on radiographs and in 86% on magnetic resonance imaging, in MCP – in 45% and 66% of cases, respectively. Erosion in DIP were found in 41% of patients according to MRI and 34% as a result of X-ray examination, in PIP – in 27% and 13% of cases, in MCP – in 60% and 8% of cases, respectively. Subluxations were determined in DIP 23% on radiographs in 31% of cases by MRI, in PIP – in 8% and 6% (p>0.05), in MCP subluxations almost never met – in 3% of cases by conventional radiography.

Conclusions. MRI in HOA can be used in the detection of erosive process, differential diagnosis with other diseases of the joints, determination of inflammatory changes in the hands and assessment of their severity, but has no significant advantages over standard radiography in determining the symptoms of degenerative-dystrophic nature (JSN and OP). Subluxations of the MCP joints are not typical for the HOA.

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