Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514502
T. Chandy, C. P. Sharma
Chitosan, a natural polysaccharide, having structural characteristics similar to glycosaminoglycans seems to be non-toxic and bioadsorbable. The chitosan matrix has been extensively investigated in the author's laboratory for a variety of biomedical applications, such as the removal of bilirubin, haemodialysis membranes, for delivery of drugs, charcoal encapsulated chitosan beads (ACCB) for toxin removal, specific immunoadsorbent matrix, chitosan coated hydroxyapatite as orthopaedic and dental dialysis materials etc. Thus, chitosan is a viable material, which can be fabricated into various forms, such as beads, granules tablets, membranes etc, as per requirements. With all these variety of biomedical uses, it appears, chitosan may be a future promise for anchoring the tissue interfaces. This paper highlights the importance of this novel matrix for such biomedical applications.
{"title":"Resorbable chitosan matrix-a promising biomaterial for the future","authors":"T. Chandy, C. P. Sharma","doi":"10.1109/SBEC.1995.514502","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514502","url":null,"abstract":"Chitosan, a natural polysaccharide, having structural characteristics similar to glycosaminoglycans seems to be non-toxic and bioadsorbable. The chitosan matrix has been extensively investigated in the author's laboratory for a variety of biomedical applications, such as the removal of bilirubin, haemodialysis membranes, for delivery of drugs, charcoal encapsulated chitosan beads (ACCB) for toxin removal, specific immunoadsorbent matrix, chitosan coated hydroxyapatite as orthopaedic and dental dialysis materials etc. Thus, chitosan is a viable material, which can be fabricated into various forms, such as beads, granules tablets, membranes etc, as per requirements. With all these variety of biomedical uses, it appears, chitosan may be a future promise for anchoring the tissue interfaces. This paper highlights the importance of this novel matrix for such biomedical applications.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114963059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514432
J. Hanft, H. Hogan, D. Hood
A procedure for creating a three-dimensional finite element model of a horse's foot is presented. This procedure is applicable to a variety of complex biological structures including joints.
提出了一种建立马蹄三维有限元模型的方法。该程序适用于包括关节在内的各种复杂生物结构。
{"title":"Three-dimensional finite element modeling of the horse's foot","authors":"J. Hanft, H. Hogan, D. Hood","doi":"10.1109/SBEC.1995.514432","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514432","url":null,"abstract":"A procedure for creating a three-dimensional finite element model of a horse's foot is presented. This procedure is applicable to a variety of complex biological structures including joints.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131114892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514447
S. Moeini, W. Perry, J.R. Tamarapalli, J. Lemons, M. J. Wilkins, R. Meyer
A proposed alternative to existing "suboptimal" therapies or fusion available for the treatment of scapholunate dissociation is its replacement with a bone-ligament-bone unit transferred from the ankle. The objective of this study was to evaluate the biomechanical properties of ankle ligaments compared to wrist ligaments for their potentials as a bone-ligament-bone replacement. Based upon the mechanical strength and strain properties displayed by the ankle ligaments tested, a good biomechanical rationale exists for transferring either the anterior talofibular or anterior tibiofibular ligament for the clinical replacement of the scapholunate ligament.
{"title":"Biomechanics of bone-ligament-bone units for reconstruction of the scapholunate","authors":"S. Moeini, W. Perry, J.R. Tamarapalli, J. Lemons, M. J. Wilkins, R. Meyer","doi":"10.1109/SBEC.1995.514447","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514447","url":null,"abstract":"A proposed alternative to existing \"suboptimal\" therapies or fusion available for the treatment of scapholunate dissociation is its replacement with a bone-ligament-bone unit transferred from the ankle. The objective of this study was to evaluate the biomechanical properties of ankle ligaments compared to wrist ligaments for their potentials as a bone-ligament-bone replacement. Based upon the mechanical strength and strain properties displayed by the ankle ligaments tested, a good biomechanical rationale exists for transferring either the anterior talofibular or anterior tibiofibular ligament for the clinical replacement of the scapholunate ligament.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"682 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132518532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514496
H. Ranu
A continuous pressure-volume relation is determined within the nucleus pulposus of the human spinal disc by infusing saline solution. The data show that the nucleus pulposus has the properties of a tight hydraulic space in which a large pressure rise results from a small increase in volume and the opposite is also true.
{"title":"Pressure-volume studies in human lumbar spinal discs","authors":"H. Ranu","doi":"10.1109/SBEC.1995.514496","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514496","url":null,"abstract":"A continuous pressure-volume relation is determined within the nucleus pulposus of the human spinal disc by infusing saline solution. The data show that the nucleus pulposus has the properties of a tight hydraulic space in which a large pressure rise results from a small increase in volume and the opposite is also true.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116349173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514500
H. Ranu
The doctoral degree is an innovative development in the American health care arena and offers the opportunity to investigate health care within the national and interdisciplinary context. The study of health care requires an awareness of new forms of information and ability to synthesize material from a wide range of disciplines and to communicate outcomes. This program is designed to meet the objective of healthy people for the year 2000 and beyond. Topics discussed include admission requirements, criteria for student intake, core courses, elective courses and career opportunities.
{"title":"Development of a doctoral program in health care sciences","authors":"H. Ranu","doi":"10.1109/SBEC.1995.514500","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514500","url":null,"abstract":"The doctoral degree is an innovative development in the American health care arena and offers the opportunity to investigate health care within the national and interdisciplinary context. The study of health care requires an awareness of new forms of information and ability to synthesize material from a wide range of disciplines and to communicate outcomes. This program is designed to meet the objective of healthy people for the year 2000 and beyond. Topics discussed include admission requirements, criteria for student intake, core courses, elective courses and career opportunities.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134356484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514457
T. Yamamuro
Summary form only given. Apatite- and wollastonite-containing glass-ceramic (AG-GC) was synthesized in 1981 at Kyoto University, Japan to be used as a strong and bone-bonding artificial bone. It is a hybrid material consisting of three phases of apatite, wollastonite, and glass with a chemical composition of MgO 4.6, CaO 44.9, SiO/sub 2/ 34.2, P/sub 2/O/sub 5/ 16,3, CaF/sub 2/ 8.5 in weight ratio. Its compressive strength, bending strength and elastic modulus are higher than those of human cortical bone. It has excellent biocompatibility and became firmly bonded directly with bone by 8 weeks when it was implanted into the tibia of a rabbit or fixed on the surface of the cortex of a rabbit tibia. After obtaining favorable results in animal experiments where vertebral prostheses made of AW-GC were used to replace the lumbar vertebra of sheep, the authors prepared an AW-GC made vertebral prosthesis for clinical use in 1983. Since then, the vertebral prosthesis has been used in 1,070 clinical cases to replace vertebrae which were affected by malignant tumors, burst fracture, compression fracture, and fracture dislocation. The prosthesis was firmly fixed to the adjacent bone with either Zielke's instruments or a Kaneda device anteriorly, and if necessary, in combination with either Luque or Harrington rods posteriorly. The authors have not experienced, up to the present, dislocation, loosening, or breakage of the prosthesis. In 1987 the authors prepared an iliac crest prosthesis, a laminoplasty spacer, and a granular bone filler made of AW-GC. Since then, the iliac crest prosthesis has been used in 4,113 clinical cases to restore the shape of the iliac crest after harvesting a large bone graft from it. Patient satisfaction regarding appearance of the crest, pain, and foreign body feeling was excellent in 97% of the patients after two years postoperatively. New bone formation around the prosthesis progressed steadily, and one year after the operation, good new bone formation was observed in 90% of the patients.
{"title":"Development and clinical application of artificial bone and bioactive bone cement in Japan","authors":"T. Yamamuro","doi":"10.1109/SBEC.1995.514457","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514457","url":null,"abstract":"Summary form only given. Apatite- and wollastonite-containing glass-ceramic (AG-GC) was synthesized in 1981 at Kyoto University, Japan to be used as a strong and bone-bonding artificial bone. It is a hybrid material consisting of three phases of apatite, wollastonite, and glass with a chemical composition of MgO 4.6, CaO 44.9, SiO/sub 2/ 34.2, P/sub 2/O/sub 5/ 16,3, CaF/sub 2/ 8.5 in weight ratio. Its compressive strength, bending strength and elastic modulus are higher than those of human cortical bone. It has excellent biocompatibility and became firmly bonded directly with bone by 8 weeks when it was implanted into the tibia of a rabbit or fixed on the surface of the cortex of a rabbit tibia. After obtaining favorable results in animal experiments where vertebral prostheses made of AW-GC were used to replace the lumbar vertebra of sheep, the authors prepared an AW-GC made vertebral prosthesis for clinical use in 1983. Since then, the vertebral prosthesis has been used in 1,070 clinical cases to replace vertebrae which were affected by malignant tumors, burst fracture, compression fracture, and fracture dislocation. The prosthesis was firmly fixed to the adjacent bone with either Zielke's instruments or a Kaneda device anteriorly, and if necessary, in combination with either Luque or Harrington rods posteriorly. The authors have not experienced, up to the present, dislocation, loosening, or breakage of the prosthesis. In 1987 the authors prepared an iliac crest prosthesis, a laminoplasty spacer, and a granular bone filler made of AW-GC. Since then, the iliac crest prosthesis has been used in 4,113 clinical cases to restore the shape of the iliac crest after harvesting a large bone graft from it. Patient satisfaction regarding appearance of the crest, pain, and foreign body feeling was excellent in 97% of the patients after two years postoperatively. New bone formation around the prosthesis progressed steadily, and one year after the operation, good new bone formation was observed in 90% of the patients.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134275391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514482
N. F. MacLean, R. Rankin, M. Sherebrin, A. Fenster, M. R. Roach
Angioplasty is a common and successful technique for reopening stenosed arteries to blood flow. In spite of this achievement, a large number of patients restenose the site of angioplasty within only 6 months of the procedure. Clearly, the patient's response to angioplasty is not consistent but instead, appears to be unpredictable. Although angioplasty is often chosen over surgery, the mechanism by which angioplasty achieves luminal enlargement is not completely understood. The authors believe that the most important parameters that determines the response of a stenosed artery are the elastic properties of the artery and the composition of the plaque. Here, the authors examined the response of 4 isolated human common iliac arteries to balloon angioplasty. Aorto-iliac branches were harvested at autopsy from patients aged between 39 and 60 years. The specimens were cleaned of adipose tissue and were made pressure tight by tying-off side branches. The bifurcations were mounted in a high-resolution laboratory computed tomographic (CT) scanner and were studied at luminal pressures ranging from 8 to 24 kPa. Humidified air was used to pressurize the lumen because it kept the arteries moist during the experiment. Common iliac artery distensibility was measured from 2-dimensional (2D) cross-sectional slices obtained at seven pressures both pre- and post-angioplasty. The diameter of the balloon was chosen to be 1.2/spl times/the diameter of the normal common iliac diameter. Following the acquisition of the 2D images, a 3-dimensional volume image was obtained at a luminal pressure of 13.3 kPa. The authors found a considerable change in the mechanical properties of the iliac arteries they have studied. Luminal cross-sectional area increased linearly with arterial pressure prior to angioplasty but became nonlinear following angioplasty. The variation in area with pressure was shown to have 2 components: an initial linear increase at low pressure followed by a plateau at higher pressures. Distensibility was calculated from the slopes of the luminal perimeter versus pressure graphs and were found to be linear pre-angioplasty, but nonlinear post-angioplasty. The authors speculate that angioplasty increases luminal area by tearing elastin sheets but this remains to be proven.
{"title":"An investigation into the role of iliac artery distensibility in balloon angioplasty","authors":"N. F. MacLean, R. Rankin, M. Sherebrin, A. Fenster, M. R. Roach","doi":"10.1109/SBEC.1995.514482","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514482","url":null,"abstract":"Angioplasty is a common and successful technique for reopening stenosed arteries to blood flow. In spite of this achievement, a large number of patients restenose the site of angioplasty within only 6 months of the procedure. Clearly, the patient's response to angioplasty is not consistent but instead, appears to be unpredictable. Although angioplasty is often chosen over surgery, the mechanism by which angioplasty achieves luminal enlargement is not completely understood. The authors believe that the most important parameters that determines the response of a stenosed artery are the elastic properties of the artery and the composition of the plaque. Here, the authors examined the response of 4 isolated human common iliac arteries to balloon angioplasty. Aorto-iliac branches were harvested at autopsy from patients aged between 39 and 60 years. The specimens were cleaned of adipose tissue and were made pressure tight by tying-off side branches. The bifurcations were mounted in a high-resolution laboratory computed tomographic (CT) scanner and were studied at luminal pressures ranging from 8 to 24 kPa. Humidified air was used to pressurize the lumen because it kept the arteries moist during the experiment. Common iliac artery distensibility was measured from 2-dimensional (2D) cross-sectional slices obtained at seven pressures both pre- and post-angioplasty. The diameter of the balloon was chosen to be 1.2/spl times/the diameter of the normal common iliac diameter. Following the acquisition of the 2D images, a 3-dimensional volume image was obtained at a luminal pressure of 13.3 kPa. The authors found a considerable change in the mechanical properties of the iliac arteries they have studied. Luminal cross-sectional area increased linearly with arterial pressure prior to angioplasty but became nonlinear following angioplasty. The variation in area with pressure was shown to have 2 components: an initial linear increase at low pressure followed by a plateau at higher pressures. Distensibility was calculated from the slopes of the luminal perimeter versus pressure graphs and were found to be linear pre-angioplasty, but nonlinear post-angioplasty. The authors speculate that angioplasty increases luminal area by tearing elastin sheets but this remains to be proven.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128771618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514440
S. Phillips, A. Puckett, A. McKie
Summary form only received as follows: The objective of this study was to monitor the change in oxidation levels of radiation sterilized ultra high molecular weight polyethylene (UHMWPE) with time. Specimens of UHMWPE were packaged in air and sterilized at 2.5 megarads or 3.7 megarads using a commercial cycle. Control specimens from the same lot of material which were not sterilized were monitored over the same time period. Each sample was sectioned upon receipt to produce three 100 /spl mu/m thick specimens which were characterized using Fourier transform infrared (FTIR) microscopy. Spectra were collected at 100 /spl mu/m increments using a vernier stage and adjustable slit aperture. The initial surface oxidation levels were 300% greater than control samples for both radiation levels. After 12 months of storage, additional samples were prepared and examined. Samples irradiated at 3.7 megarads in air showed an additional 500% increase in surface oxidation which extended 200 /spl mu/m into the material. For the sample irradiated at 2.5 megarads a 300% additional increase in oxidation level was found on the surface but the oxidation level was only 170% greater at 200 /spl mu/m. These results suggest that radiation sterilized UHMWPE undergoes significant increases during storage. Oxidation of radiation sterilized UHMWPE implants may have a significant impact on the bearing properties of these materials.
摘要:本研究的目的是监测辐射灭菌超高分子量聚乙烯(UHMWPE)氧化水平随时间的变化。超高分子量聚乙烯标本在空气中包装，并使用商业循环在2.5兆加仑或3.7兆加仑灭菌。同一批次未灭菌材料的对照标本在同一时间段内进行监测。每个样品在收到后切片，产生三个100 /spl mu/m厚的样品，使用傅里叶变换红外(FTIR)显微镜进行表征。采用游标平台和可调狭缝孔径，以100 /spl μ m的增量采集光谱。在两种辐射水平下，初始表面氧化水平都比对照样品高300%。储存12个月后，准备并检查额外的样品。样品在空气中辐照3.7兆加仑时，表面氧化增加500%，向材料中扩展200 /spl μ l /m。在2.5 μ g辐照下，样品表面氧化水平增加了300%，而在200 μ g / m2辐照下，氧化水平仅增加了170%。这些结果表明，辐射灭菌的超高分子量聚乙烯在储存过程中会显著增加。辐射灭菌的超高分子量聚乙烯植入物的氧化可能对这些材料的承载性能产生重大影响。
{"title":"Oxidation level changes in radiation sterilized ultra high molecular weight polyethylene [medical implant material application]","authors":"S. Phillips, A. Puckett, A. McKie","doi":"10.1109/SBEC.1995.514440","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514440","url":null,"abstract":"Summary form only received as follows: The objective of this study was to monitor the change in oxidation levels of radiation sterilized ultra high molecular weight polyethylene (UHMWPE) with time. Specimens of UHMWPE were packaged in air and sterilized at 2.5 megarads or 3.7 megarads using a commercial cycle. Control specimens from the same lot of material which were not sterilized were monitored over the same time period. Each sample was sectioned upon receipt to produce three 100 /spl mu/m thick specimens which were characterized using Fourier transform infrared (FTIR) microscopy. Spectra were collected at 100 /spl mu/m increments using a vernier stage and adjustable slit aperture. The initial surface oxidation levels were 300% greater than control samples for both radiation levels. After 12 months of storage, additional samples were prepared and examined. Samples irradiated at 3.7 megarads in air showed an additional 500% increase in surface oxidation which extended 200 /spl mu/m into the material. For the sample irradiated at 2.5 megarads a 300% additional increase in oxidation level was found on the surface but the oxidation level was only 170% greater at 200 /spl mu/m. These results suggest that radiation sterilized UHMWPE undergoes significant increases during storage. Oxidation of radiation sterilized UHMWPE implants may have a significant impact on the bearing properties of these materials.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132506200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514497
G. Miller, C. Goll, W. Soscia, W. Petty, V. Choudry
Successful reconstruction of the knee involves appropriate patient selection, implant design, implant material and surgical technique. Although the performance and longevity of these arthroplasties continues to improve, their performance is not as long-lasting as we have come to expect from total hip arthroplasty. The work reported in this study depicts the preliminary results of the effect of femoral component varus/valgus position and flexion position using a real-time computerized pressure mapping system (TekScan) for three designs with different geometric congruities.
{"title":"Polyethylene contact stress and knee condylar design","authors":"G. Miller, C. Goll, W. Soscia, W. Petty, V. Choudry","doi":"10.1109/SBEC.1995.514497","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514497","url":null,"abstract":"Successful reconstruction of the knee involves appropriate patient selection, implant design, implant material and surgical technique. Although the performance and longevity of these arthroplasties continues to improve, their performance is not as long-lasting as we have come to expect from total hip arthroplasty. The work reported in this study depicts the preliminary results of the effect of femoral component varus/valgus position and flexion position using a real-time computerized pressure mapping system (TekScan) for three designs with different geometric congruities.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128755650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1995-04-07DOI: 10.1109/SBEC.1995.514448
P. Christakis, L.S. Popich, S. Cook, M. E. Brunet
This study addresses the effects of extensor mechanism realignment (EMR) on patellar tracking patterns in pathologic knees. Ten patients diagnosed with patellar maltracking, subluxation, or patellofemoral malalignment and requiring an EMR participated in the study. Lateral release and vastus medialis obliquus (VMO) advancement were performed unilaterally in all ten patients. Tibial tubercle transfer was conducted in five of these patients. Electromagnetic sensors were used to dynamically measure patellar and tibial motion relative to the femur in three dimensions. Patella flexion, rotation, tilt, and shift were measured as the knee was passively flexed from full extension to 90/spl deg/ knee flexion. Lateral release had little effect on patellar spin and flexion patterns, although it did increase net medial shift in seven of ten cases. Following VMO advancement the rate of patellar flexion and net medial patellar spin increased in seven cases. Net lateral patellar tilt increased in seven cases and medial shift increased in five cases. Due to a limited amount of data, conclusive observations could not be made regarding tibial tubercle transfer.
{"title":"Dynamic three-dimensional in vivo tracking of the abnormal extensor mechanism","authors":"P. Christakis, L.S. Popich, S. Cook, M. E. Brunet","doi":"10.1109/SBEC.1995.514448","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514448","url":null,"abstract":"This study addresses the effects of extensor mechanism realignment (EMR) on patellar tracking patterns in pathologic knees. Ten patients diagnosed with patellar maltracking, subluxation, or patellofemoral malalignment and requiring an EMR participated in the study. Lateral release and vastus medialis obliquus (VMO) advancement were performed unilaterally in all ten patients. Tibial tubercle transfer was conducted in five of these patients. Electromagnetic sensors were used to dynamically measure patellar and tibial motion relative to the femur in three dimensions. Patella flexion, rotation, tilt, and shift were measured as the knee was passively flexed from full extension to 90/spl deg/ knee flexion. Lateral release had little effect on patellar spin and flexion patterns, although it did increase net medial shift in seven of ten cases. Following VMO advancement the rate of patellar flexion and net medial patellar spin increased in seven cases. Net lateral patellar tilt increased in seven cases and medial shift increased in five cases. Due to a limited amount of data, conclusive observations could not be made regarding tibial tubercle transfer.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114666855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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