The suitability of femoral stem to proximal femur is essential to total hip arthroplasty, especially non-comented femoral stem. Therefore, it is important to assess the bone quality and morphology of proximal femur preoperatively. We performed
the
radiographic evaluation of 120 normal Korean proximal femurs which were consist of 60 males and 60 females with age range from 20 years old to 80 years old. We obtained the both hip AP and lateral view from each person, who was supine position
and
applicated the brace which consistently made the both feet into 15。 internal rotation and 15。abduction.
Qualitatively, we classified the proximal femurs into type A,B,C and quantitatively calculated the calcar-to-canal isthmus ratio(CC ratio) on AP view and cortical index (CI) on AP and lateral view in the use of method reported by Dorr.
@ES The results were as follows:
@EN 1. Qualitatively, 47 pro9ximal femurs were type A bones, 41 were type B bone and 32 were type C bones.
2. Type A bone had average CC ratio 0.61, CI on AP view 0.62 and CI on lateral view 0.58
Type B bone had average CC ratio 0.62, CI on AP view 0.49 and CI on lateral view 0.47.
Type C bone had average CC ratio 0.68, CI on AP view 0.36 and CI on lateral view 0.43
3. CFI (canal flare inedex) of each group were as follows:
Type A: 4.235, Type B:3.806, Type C: 3.16
4. Type A bone was more commonly seen in younger persons and had smaller CC ratio and larger CFL and type C bone was vice versa. The CC ratio and CFA showed significant inversional corre lationship statistically (r=-0.552. p<0.05)
5. Our study showed that preoperative radiographic evaluation for total hip arthroplasty needs not only quantitative assessment of proximal femur but also qualitative assessment because morpho logic endosteal geometry of proximal femur is not
always
correlated with the bone quality. On this point of view, radiological classification as described by Dorr was thought to be one of the useful method for preoperative radiological evaluation of total hip arthroplasty.
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