1993 Fiscal Year Final Research Report Summary
Development of new type of surface total hip replacement
| Project/Area Number |
02404061
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Orthopaedic surgery
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
SUGIOKA Yoichi Kyushu University, Faculty of Medicine, Professor, 医学部, 教授 (30037361)
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| Co-Investigator(Kenkyū-buntansha) |
MIURA Hiromasa Kyushu University, Faculty of Medicine, Research Associate, 医学部, 助手 (10239189)
HAYASHI Kazuo Kyushu University, Faculty of Medicine, Associate Professor, 医学部, 助教授 (20180961)
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| Project Period (FY) |
1990 – 1993
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| Keywords | surface total hip replacement / biomechanics / finite element method / rigid-body spring model / hydroxyapatite |
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| Research Abstract |
Rigid fixation of a femoral componet is essential to achieve better results of surface total hip replacement. The basic concept of a new femoral component is to prevent stress shielding and avascular necrosis of the femoral head by minimizing the resurfaced area in comparison to the currently available surface replacement. A small peg is added to the center of the implant in order to provide the initial rigid fixation. Biomechanical analysis showed that optimal covering angle of the femoral component is 180 degrees and an acetabular comonent with 140 degrees of open angle does not tend to dislocate under physiological loading conditions. Animal experiments showed that hydroxyapatite coated titanium achieved better bone induction and fixation rigidity under loading conditions.
Implants for human were developed on the basis of the biomechanical and animal studies. Strength test of the femoral component under vertical compression force revealed adequate mechanical strength. Instruments were also developed for easy and precise operation. We are simulating the operation using plastic models made from CT of patients to improve the instruments. Clinical application of the new surface replacement will start after mechanical tests of the implant and development of the instruments are completed.
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