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Jansen's metaphyseal chondrodysplasia (JMC) is a disease that results from ligand-independent activation of the type 1 of the parathyroid hormone receptor, due to one of three reported mutations (activating mutation). [1] JMC is extremely rare, and as of 2007 there are fewer than 20 reported cases worldwide.
Metaphyseal dysplasia, or Pyle disease, [3] is a disorder of the bones. It is a rare disease in which the outer part of the shafts of long bones is thinner than normal and there is an increased chance of fractures .
Metaphyseal chondrodysplasia Schmid type is a type of chondrodysplasia associated with a deficiency of collagen, type X, alpha 1. [2] [3] [4]Unlike other "rickets syndromes", affected individuals have normal serum calcium, phosphorus, and urinary amino acid levels.
Such manifestations usually result from disruption of physeal growth especially that osteochondromas typically arise at the metaphyseal ends of long bones in close proximity to the physis. [ 1 ] [ 5 ] Intra-articular osteochondromas of the hip can induce limitation of range of motion, joint pain and acetabular dysplasia. [ 2 ]
Ghosal hematodiaphyseal dysplasia, is a rare, autosomal recessive disease, characterized by diaphyseal dysplasia and metaphyseal dysplasia of the long bones and refractory anemia. [ 2 ] [ 3 ] [ 1 ] It is associated with a deficiency of Thromboxane-A synthase , [ 4 ] which produces Thromboxane A2 .
Verloes Van Maldergem Marneffe syndrome, also known as microspherophakia-metaphyseal dysplasia is a very rare genetic disorder which is characterized by flattened and deformed vertebrae, developmental delay, dysplasia of the epiphyses and metaphyses, lens coloboma and dislocation, microspherophakia, nearsightedness, retinal detachment, and spinal stenosis.
Spondyloepimetaphyseal dysplasia, Strudwick type is an inherited disorder of bone growth that results in dwarfism, characteristic skeletal abnormalities, and problems with vision. [1] The name of the condition indicates that it affects the bones of the spine (spondylo-) and two regions near the ends of bones ( epiphyses and metaphyses ).
Metaphyseal tumors or lesions include osteosarcoma, chondrosarcoma, fibrosarcoma, osteoblastoma, enchondroma, fibrous dysplasia, simple bone cyst, aneurysmal bone cyst, non-ossifying fibroma, and osteoid osteoma. [5] One of the clinical signs of rickets that doctors look for is cupping and fraying at the metaphyses when seen on X-ray.