Brachydactyly Mononen Type, also called Mononen-Karnes-Senac syndrome, is a rare combination of birth defects, or a syndrome. This syndrome is characterized by short fingers and toes, short stature, and overgrowth of the fibula (a bone in the calf). People with this condition may also exhibit mild bowleggedness, which is a condition in which the knees stay wide apart when you stand with your feet together. Brachydactyly Mononen Type has only been seen in two males, their mothers, and a maternal aunt, and so this condition is believed to be X-linked (maternal) dominant. In the cases seen, males are affected more severely than females. This syndrome is treated on a case-by-case basis.