arthrokatadysis

ar·thro·ka·tad·y·sis

(ar'thrō-kă-tad'i-sis), Significant erosion of the concave surface of a joint; results in migration of the convex surface medially.
See also: Otto disease.
[arthro- + G. katadysis, a dipping under, a setting, fr. dyō, to make sink]

Otto,

Adolph W., German surgeon, 1786-1845. Otto disease - characterized by an inward bulging of the acetabulum into the pelvic cavity, resulting from arthritis of the hip joints. Synonym(s): arthrokatadysis; Otto pelvis; protrusio acetabuliOtto forcepsOtto pelvis - Synonym(s): Otto disease