Osteopetrosis, also known as marble bone disease, is a rare genetic disorder in which the bones become abnormally dense and hard due to defective bone remodeling. Normally, specialized cells called osteoclasts break down old bone tissue so that new bone can form. In osteopetrosis, osteoclasts do not function properly, causing excessive bone buildup.
Despite appearing stronger on X-rays, these bones are often brittle and prone to fractures.
Other symptoms may include frequent bone fractures, bone pain, short stature, delayed growth, dental abnormalities, hearing or vision problems, and recurrent infections. In severe forms, excessive bone growth can narrow the spaces within bones, affecting bone marrow function and leading to anemia, low platelet counts, and increased susceptibility to infections.
A family history of osteopetrosis and inheriting faulty genes from one or both parents increases the risk of getting this condition.
Management depends on the type and severity of the disease. Treatment may include supportive care, physical therapy, fracture management, and monitoring of vision, hearing, and blood counts. In severe infantile forms, hematopoietic stem cell transplantation (HSCT) may be considered, as it can improve osteoclast function and alter disease progression.
