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진공 혼합방법이 골 시멘트의 인장 강도에 미치는 영향에 대한 실험적 연구
손원용 ( WY Shon ),변영수 ( YS Byun ),이응주 ( EJ Lee ) 대한고관절학회 1993 Hip and Pelvis Vol.5 No.2
Recently as cemented arthroplasty becomes more popular, interest in the methods which may improve the strength of acrylic bone cement has increased. It has been reported that the mechanical properties of acrylic bone cement can be improved by reduction of porosity. The authors made 15 specimens of ASTM standard with acrylic bone cement by two methods; hand mixing and vacuum mixing. The specimens were evaluated for their porosity by nake eyes and densitometer, and the mechanical properties were examined. The results were as follows' The porosity of the vacuum mixed specimens was markedly reduced than that of hand mixed specimens. The ultimate tensile strength test showed 42.90 +- 1.4 Mpa for vacuum mixed specimens wit,h 22.4% improvement than 35. 04+-1. 5 Mpa in hand mixed specimens. In conclusion, vacuum mixing technique is able to reduce the porosity and incerase tensile strength of the acrylic bone cement.
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술전 방사선학적 평가로서 Dorr씨 법에 의한 근위 대퇴골의 분류에 대한 고찰
손원용 ( WY Shon ),이석현 ( SH Lee ),서승우 ( SW Suh ),전승주 ( SJ Jeon ) 대한고관절학회 1995 Hip and Pelvis Vol.7 No.1
The suitability of femoral stem to proximal femur is essential to total hip arthroplasty, especially non-comented femoral stem. 7herefore, 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. The results were as follows: 1. Qualitatively, 47 proximal femurs were type A bones, 41 were type B bones and 32 were type C bones. 2. 7ype 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 index) of each group were as follows: Type A: 4.325, 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 CFI and type C bone was vice versa. The CC ratio and CFI 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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