The study examines whether a mechanical arm ultrasound system provides diagnostic accuracy comparable to expert-performed full ultrasound for detecting key joint components and whether it can reduce acquisition variability without compromising accuracy, as measured by false-positive and false-negative rates.

Inclusion Criteria:

• Diagnosis of hemophilia A or B or other bleeding disorders
• Cooperative patients
• Previous study joint bleed (by history) or suspicion of an acute joint bleed

Exclusion Criteria:

• Co-morbid chronic illnesses causing osteoarticular findings
• MRI contraindications

De-identified participant-level data underlying published findings, along with related documents such as the study protocol and statistical analysis plan.

Beginning 1 month and ending 3 years after the publication of results

De-identified individual participant data (IPD) from this study will be made available to qualified researchers conducting independent, scientifically valid research, contingent upon obtaining any required approvals from an Institutional Review Board (IRB). Eligible researchers may access de-identified, coded participant-level data with no personal health information, along with supporting study documents. Access will occur through a controlled process in which researchers must submit a formal data request, and data-sharing agreements may be executed when needed.