The use oftotal hip0 arthroplasty is steadily increasing. The development of bone cement as a filler between bone and hip prosthesis was a revolutionary step in orthopedics in the 1960s since the short-term results were excellent with
consistent relief of pain and disability. However, long-term results revealed an increased rate of mechanical loosening in younger, active patients whereas the revision rate in older patients is significant lower. Improvement in
cementation techniques have reduced the incidence of mechanical loosening. The process of biologic ingrowth into porus metal surfaces has evolved as a possible solution for high-risk, younger, and heavierpatients. Under ideal cirumstances,
where
good bone quality exists and rigid initial implant stability is achieved, bone ingrowth will occur. However, failure to achieve solid bony fixation may be a source of thigh pain in cementless femoral stems and the clinical result of
cementless prosthesis was not better than that of cemented ones.
Synthetic hydroxyapative is highly biocompatible and has chemical and crystalline structuro same as the major mineral component of biologic apatite. Numerus experimental studies and several clinical datas tell us that bone has an
affinity
for
hydroxyaptite, resulting in raped and early bone boneing. The clinical and radiologic observation during short-term period revealed there was no significant difference between two groups. However, during early postop. period, clinical
results
of
HA-coting group were supirior than those of NON-HA coating group. HA coating may be effective on early bone ingrowth, resulting early weight bearing and less thigh pain.
|