Disclosed therein is a big
femoral head and
femoral head surface replacement, which are used for hip
osteoarthritis and vascular
necrosis of
femoral head. As a person get older and aged, the
weight bearing hip joint is indispensably changed to
osteoarthritis and sometimes showed
avascular necrosis of the femoral head with unknown
etiology. The deformed femoral head and hip joint should be replaced with the THA. Till now, the
total hip replacement is performed in such a way that the necrosed femoral head and a healthy
femoral neck are all removed and a
femoral stem is inserted into the marrow cavity, and in this case, a small femoral head causes a reduction of a
range of motion and
dislocation of the hip joint occasionally, and
osteolysis due to abrasion of plastic
acetabular liner. In case of a conventional femoral
head surface replacement (hereinafter, called “conventional FHSR”), a complication of
femoral neck fracture and could not
combined use with conventional THA. Recently, hard bearing
system such as
metal on
metal THA or
ceramic on
ceramic THA without using plastic has been introduced to solve the problem of
osteolysis due to abraded plastic particles generated when the THA is worn out as time goes. But there also have many problems as a limited
range of motion, resected normal
femoral neck and difficulties of rereplacement of the
femoral stem. Because of the big femoral head or the FHSR can increase the
range of motion and lower
dislocation rate these devices are gradually widespread in young active person and Asian peoples. This invented design of the
modularity gives the convenience to the surgeon and economically lower burden to patients to use of the FHSR and big femoral head
system. The related accessory showed
initial stability of the FHSR during operation and prevent from femoral neck fracture in follow-up periods.