You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Beaded ribs with epiphysial swelling is a feature of: and explain in detail?
Rickets is characterized by the continued formation of the collagen matrix of bone, but incomplete mineralization results in soft, pliable bones. 
In osteomalacia, demineralization of pre-existing bones increases their susceptibility to fracture. Insufficient exposure to daylight and/or deficiencies in vitamin D consumption occur predominantly in infants and the elderly. 
Vitamin D deficiency is more common in the northern latitudes, because less vitamin D synthesis occurs in the skin as a result of reduced exposure to ultraviolet light. 
Loss-of-function mutations in the vitamin D receptor result in hereditary vitamin D-deficient rickets.
Vitamin D deficient rickets leads to epiphyseal swelling with beaded ribs known as Rachitic rosary.

Key Concept:
Vitamin D deficient rickets leads to epiphyseal swelling with beaded ribs known as Rachitic rosary.
Ref: Lippincott’s illustrated reviews for biochemistry, 7th edition.