Bone fragmentation in the rheumatoid wrist: radiographic and pathologic considerations

Area of Science:

• Rheumatology
• Orthopedic Surgery
• Pathology

Background:

• Rheumatoid arthritis (RA) commonly affects joints, leading to bone and cartilage destruction.
• Wrist involvement is frequent in RA, often causing pain, deformity, and functional loss.
• Specific patterns of bone fragmentation in RA are not well-characterized.

Purpose of the Study:

• To describe a peculiar pattern of wrist bone fragmentation observed in rheumatoid arthritis patients.
• To investigate the potential pathogenesis and clinical significance of this fragmentation pattern.
• To discuss the differential diagnosis of this finding in the context of rheumatoid arthritis.

Main Methods:

• Radiographic and gross pathological examination of wrists from 50 rheumatoid arthritis patients.
• Identification and characterization of specific bone fragmentation features.
• Review of literature concerning rheumatoid arthritis-related bone changes and fistulous rheumatism.

Main Results:

• A distinct pattern of wrist bone fragmentation was identified in 16% of patients.
• This pattern included erosion of the navicular, distal radius and ulna, carpal fusion, demineralization, and elongated bony spicules.
• Similar findings were observed in rheumatoid cadavers, supporting the association with RA.

Conclusions:

• The described bone fragmentation pattern is a notable complication in rheumatoid arthritis.
• Potential contributing factors include pannus proliferation, osseous compression, and fracture.
• Further investigation is needed to clarify the fate of detached spicules and their relation to fistulous rheumatism.