Haemophilia is a mostly inherited genetic disorder that impairs the body's ability to make blood clots, a process needed to stop bleeding. This results in people bleeding for a longer time after an injury, easy bruising, and an increased risk of bleeding inside joints or the brain. [Source: Wikipedia ]

OrphaNet reference
May Cause
Arthritis with new bone formation
Arthritis with osteoporosis
Atlantoaxial instability
Avascular necrosis
Bilateral large kidneys
Bleeding disorder with chronic hemarthrosis
Bleeding tendency
Body asymmetry
Broad tubular bones
Cerebral infarction
Displaced elbow fat pad
Enlarged distal femoral intercondylar notch
Enlarged epiglottis
Enlarged iliopsoas muscle
Epiphyseal necrosis
Flat femoral head
Fragmented femoral head
Fragmented or irregular femoral head
Gastrointestinal system bleeding
Generalized large epiphyses
Generalized osteoporosis
Humeral head deformity
Intra-articular calcification
Intracerebral hemorrhage
Intramural bowel hemorrhage
Intramural gastrointestinal tract hemorrhage
Intramural hemorrhage of small bowel
Joint effusion
Joint-crossing bone lesion
Large epiphysis
Limb asymmetry
Limited joint mobility
Localized bone overgrowth
Localized chronic pulmonary opacity
Localized periosteal reaction
Lytic skeletal lesion
Male-predominant arthritis
Multiple abnormal epiphyses
Multiple intra-articular filling defects
Multiple radiolucent bone lesions
Periarticular calcification
Pericardial effusion
Periosteal new bone formation in a child
Polyarticular joint disease
Polyostotic bone lesions in children
Premature osteoarthritis
Protrusio acetabuli
Pulmonary hemorrhage
Regional osteoporosis
Renal hemorrhage
Ring epiphyses
Shortened bone with premature growth-plate closure
Slipped capital femoral epiphysis
Soft-tissue mass with adjacent bone erosion
Subperiosteal hemorrhage
T2-hypointense intra-articular knee mass
Thick periosteal reaction along bone shaft
Thick tubular hand bones
Tibiotalar tilt
Unilateral large kidney
Urinary tract calculus
Widespread demineralization with coarse trabeculation
Widespread periosteal reaction