Study Objectives\*
1. Provide a systematic evaluation of the treatment outcomes in patients with hemophilia A 2. Emphasize the importance and clinical benefits of rFVIII-Fc in joint and bone health. 3. Compare the clinical outcomes from 1 year before and after switching to EHL. 4. Exploratory: Identify biomarkers that could provide more useful and convenient evaluations of joint and bone health. (Time-saving and easy to monitor)
Patients with severe hemophilia A (all ages).
Patients with moderate type hemophilia A with hemophilic arthropathy.
Currently on rFVIIIFc regular prophylaxis and have previous medical record with regular prophylaxis with standard half-life product for one year
Able and willing to undergo joint and bone examinations
Participants of other interventional studies.
Patients with current inhibitors.
History of major neurological disease (eg. Stroke, Parkinson's disease, neuropathy, etc.)
History of major psychiatric disease (eg. Schizophrenia, bipolar disorder)