The trunk of the corpus callosum lies between the splenium and the genu. It is also used to correct a coxa vara, genu valgum, and genu varum. It is continuous around the genu of the corpus callosum with the indusium griseum. It can cause bone deformity including short stature and genu varum (bow-leggedness). Bow legs or genu varum is one of these deformities. The development of genu recurvatum may lead to knee pain and knee osteoarthritis. Sometimes a part of the caudate nucleus is referred to as the "knee" ("genu"). Idiopathic genu valgum is a form that is either congenital or has no known cause. Developmental also known as idiopathic genu valgum is usually self-limiting and resolves during childhood. Lesions of the genu of the internal capsule affect fibers of the corticobulbar tract. The "genu" is the flexure of the internal capsule. These are the rostrum, the genu, the trunk or body, and the splenium. The genu subregion is larger in males. At birth, Jackson suffered from genu varum, or "bowed legs".