The role of ultrasound and magnetic resonance imaging in the assessment of musculoskeletal involvement in systemic lupus erythematosus: A review of recent advances and insights.

Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by diverse manifestations, with musculoskeletal (MSK) involvement being one of the most prevalent and debilitating. Traditional perceptions of SLE arthritis as mild and primarily non-erosive are increasingly challenged by advanced imaging techniques, such as ultrasound and magnetic resonance imaging (MRI). These modalities have revealed subclinical inflammatory changes, structural damage, and peri-articular soft tissue involvement in both symptomatic and asymptomatic patients. Ultrasound is highly sensitive in detecting synovitis, tenosynovitis, and entheseal abnormalities, also in patients without clinical arthritis, offering insights into subclinical disease activity that would otherwise remain undiagnosed. MRI, while less commonly used due to cost and accessibility, remains the gold standard for detecting bone marrow oedema, subtle erosions, and inflammatory changes. Recent studies demonstrate that subclinical synovitis and tenosynovitis, identified through imaging, may precede clinical symptoms in some patients, emphasizing the potential prognostic value of these findings. Bone erosions, once thought rare in SLE, are now observed across various arthropathy subtypes, challenging traditional classifications. Imaging has also revealed the presence of entheseal and muscle involvement, expanding the understanding of SLE-related MSK pathology. This review highlights the transformative role of ultrasound and MRI in diagnosing, monitoring, and managing MSK involvement in SLE. Incorporating imaging findings into routine practice and updated classification criteria may enable early intervention and personalized treatment. While significant advancements have been made in imaging technologies for detecting musculoskeletal involvement in SLE, challenges remain in standardizing protocols and correlating findings with disease activity and outcomes. Further research is needed to address these challenges and further explore the prognostic significance of imaging findings.