Joint imaging in regional migratory osteoporosis

Area of Science:

• Rheumatology
• Nuclear Medicine
• Radiology

Background:

• Regional migratory osteoporosis (RMO) is a rare condition characterized by recurrent episodes of localized bone loss.
• Diagnosis can be challenging due to non-specific symptoms and delayed radiographic findings.

Observation:

• Four patients (3 males, 1 female; ages 25-59) presented with RMO, experiencing multiple episodes of periarticular osteoporosis.
• Affected joints included ankles (3), hips (2), and knees (2). Notably, two patients exhibited involvement of small foot joints.
• Initial presentations in two cases mimicked septic arthritis.

Findings:

• Technetium-99m methylene diphosphonate (99mTc-MDP) joint imaging revealed abnormalities, including small joint involvement, in two patients.
• Joint imaging confirmed clinical suspicion in two patients prior to the appearance of radiological signs of osteoporosis.
• No specific laboratory markers are associated with RMO.

Implications:

• Joint imaging, particularly 99mTc-MDP scans, can aid in the early diagnosis of RMO.
• This imaging modality is valuable for detecting RMO before characteristic radiological changes develop.
• Prompt diagnosis through imaging may facilitate timely management and prevent misdiagnosis, such as with septic arthritis.