• Title/Summary/Keyword: bone plate

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Numerical Stress Analysis of bone plate System using 3-dimensional finite element method (3차원 유한 요소법을 이용한 골절판의 응력 해석)

  • Kim, Hyun-Su;Kwon, Young-Soo
    • Proceedings of the KOSOMBE Conference
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    • v.1991 no.05
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    • pp.74-78
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    • 1991
  • Conventional compression bone fracture plates sometimes cause osteoporosis under the plate due to their high rigidity which in turn transfer physiological load mostly through the plates and screws. In order to prevent the osteopenia we have designed a system which have a viscoelastic washer between plate and screw head. The washer is made of a biocompatible ploymer (untra high molecular weight polyethylene, UHMWPE). Three-dimensional finite element meshes of the human femur with the conventional and new concept bone plate ere generated and the comparative stress analyses are performed with static half-stance loading condition. The results of analyses showed that could reduce the stress shielding effect compared with the conventional plate.

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Spontaneous bone regeneration in resected non-continuous mandible due to medication-related osteonecrosis of the jaw

  • Esen, Alparslan;Gurses, Gokhan;Akkulah, Sebne
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.47 no.6
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    • pp.465-470
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    • 2021
  • Few cases of spontaneous bone regeneration after extensive resection of the jaw bone have been reported, but it is more common in young adults or children. In this case, we report spontaneous bone healing in a 73-year-old female patient. On radiological examination, necrotic regions were seen in the right mandible. She was diagnosed with medication-related osteonecrosis of the jaw due to previous bisphosphonate use. After segmental resection, stabilization achieved using a reconstruction plate. The periosteum was preserved during the procedure. Twelve months later, panoramic radiography was taken and bone formation was seen both horizontally and vertically around the plate. If the periosteum is preserved and stabilization is achieved after resection in benign lesions, the bone may regenerate spontaneously regardless of age. Therefore, instead of simultaneous autogenous bone application, such patients may be followed to determine whether spontaneous bone healing will occur. This should improve patient comfort and reduce surgical cost.

Usefulness of Silicone Plate for Sellar Floor Reconstruction (터어키안 저부 재건술시 실리콘 판의 유용성)

  • Kim, Sung Bum;Kim, Jae Min;Yi, Hyeong Joong;Bak, Koang Hum;Kim, Choong Hyun;Oh, Suck Jun;Lee, Seoung Hwan
    • Journal of Korean Neurosurgical Society
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    • v.29 no.9
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    • pp.1204-1208
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    • 2000
  • Objectives : At the closure of the transsphenoidal approach(TSA), the proper sellar floor reconstruction plays an important role in preventing postoperative complications. The septal cartilage, perpendicular plate of nasal septum, and the sphenoid sinus bone are usually used to repair the sellar floor as a bone splint. The authors evaluate the usefulness of a silicone plate as a substitute for bone splint to close a defect of the sellar floor. Materials and Methods : A silicone plate was used to repair the sellar floor in 7 patients with sellar lesions which included four pituitary adenomas, two Rathke's cleft cysts and one metastatic tumor. Among seven cases, five cases underwent a standard TSAs and two received a extended TSAs. The trajectories of the approach were sublabial in four cases and endonasal routes in three cases. The silicone plate for implantation was cut to a size of slightly larger than that of bone window and inserted with a three-pronged fork, and then adjusted precisely. Results : In six patients, there were no complications which related to sellar floor reconstruction. A postoperative cerebrospinal fluid(CSF) rhinorrhea was observed in one patient with pituitary macroadenoma. Conclusions : From the authors' experience, the advantages of the silicone plate are its simplicity of molding to fit any size of sellar floor defects, and easy detection of previously created bone window at reoperation.

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A Study on the Prediction of Bone Remodeling of Plated-Human Femur using 3-Dimensional Finite Element Method (3차원 유한요소법을 이용한 골절판에 대한 인체 대퇴골의 골재형성에 관한 연구)

  • 김현수
    • Journal of Biomedical Engineering Research
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    • v.13 no.4
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    • pp.353-362
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    • 1992
  • The stress distribution of bone is altered by the rigid bone plate, sometimes resulting in unfavorable osteoporosis. The rigidity and the biocompatibility are important factors for the design of prosthesis. However, it is also necessary to consider the effect on the bone remodeling. In this paper, it is attempted to establish an approximate and simple method to predict the trend of the configuration of surface bone remodeling for the case of a bone plate using stress analysis. Thus, three dimensional finite element model of plated-human femur is generated and simulated. In addition. the stress difference method (SDM) is introduced and attempted to demonstrate the configuration of surface bone remodeling of the plated-human femur. The results are compared with those of invivo tests and the feasibility of the stress difference method is discussed.

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Operative Treatment of the Clavicular Midshaft Fractures in Adult - A Comparison between Intramedullary Multiple Steinmann Pins Fixation and Reconstruction Plate Fixation - (성인 쇄골 간부 골절의 수술적 치료-골수강내 다발성 Steinmann핀 고정술과 재구성 금속판 고정술과의 비교-)

  • Lee Young Kuk;Gu Hae Seo
    • Clinics in Shoulder and Elbow
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    • v.2 no.1
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    • pp.14-20
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    • 1999
  • Purpose: Despite of the popular use of the reconstruction plate for the fixation of clavicular shaft fractures, some disadventages have been raised such as long period of immobilization, long skin incision, loosening of plate and screws, and increased chance of nonunion due to severe periosteal injury. Thus, the authors have performed intramedullary multiple Steinmann pins fixation that could reduce the disadvantages of plate fixation in order to compare the treatment results between the two groups. Materials & Methods: From 1994. Jan. to 1997. Dec. the department of orthopaedic surgery of the Kwak's hospital treated operatively for 56 cases of the clavicular shaft fractures in adult. 39 cases of them were treated with the plate fixation and 17 cases with the intramedullary multiple Steinmann pins fixation(SP group). Reconstruction plates(Plate group) were used for 26 out of 39 patients treated with plate fixation. Among the Plate group and SP group, each 15 cases were selected by age and sex and compared each other according to the bone union time, union rate, complication, and functional results. The follow-up period was 12 months at the shortest and 48 months at the longest and the average was 16 months. Results: The Plate group showed that the bone union time was 7 weeks and the bone union rate was 93%. The SP group showed 6.5 weeks and 100% respectively. In complication, the Plate group had 1 case of loosening of plate and screws and delayed union; SP group had 1 case of pin migration. The functional results according to Kang's criteria, 87% of the Plate group and 93% of the SP group showed good or excellent. Conclusion : The SP group showed very comparable results in terms of the bone union time, bone union rate, complication, and functional results comparing to the Plate group. The intramedullary multiple Steinmann pins fixation showed several advantages over the reconstruction plate fixation, which were simple operative technique, easy removal of pins, being able to perform immediate postoperative full range of motion exercise. Therefore, the intramedullary multiple Steinmann pins fixation is thought to be one of the useful operative techniques in treatment of the clavicular shaft fractures in adult.

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COMPARATIVE HISTOMORPHOMETRIC ANALYSIS OF MANDIBLE AND ILIAC BONE ON BONE DENSITY (하악골과 장골의 조직형태계측 비교)

  • Yoo, So-Jeong;Chung, Moon-Kyu
    • The Journal of Korean Academy of Prosthodontics
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    • v.38 no.1
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    • pp.12-25
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    • 2000
  • To demonstrate possible influences of general bone density on the mandible, histomorphometric analysis was carried out in mandibles and iliac bones and the correlation of the two bone densities was tested. Comparison of bony density in women and men over 60 years in the mandible was carried out too. Quantitative computed tomography(QCT) was taken in cross-section of mandibles at the same site where histomorphometric analysis was peformed to evaluate the reliability of QCT. The analysis included 40 cadavers with no known diseases affecting the bones. The subjects consisted of 15 females and 25 males with a mean age of 60.3 years. Spearman correlation analysis and Wilcoxon rank sum test was performed. The results were as follows. 1. There was statistically no correlation between the mandible and iliac bone in the values of corrected cortical width(CCW), cortical porosity(POR) in cortex, and total bone volume(TBV), mean trabecular plate thickness(MTPT), mean trabecular plate density(MTPD), and mean trabecular plate separation(MTPS) in trabecular bone. 2. Comparison of women and men over 60 years, men had statistically higher bone density than women except fir POR of buccal and lingual cortex, and WTPD of alveolar trabeculae in mandible. 3. There was statistically significant correlation between TBV of trabecular bone and CT No., but not between POR and CT No. in mandible. According to the results above, there was no correlation between mandible and iliac bone density and between mandibular bony density and age. Further studies are required to support the results. A more noninvasive method to be able to measure the bone density of mandible should be developed and it is necessary to accumulate data on the normal values of bone density of mandible according to age and sex. Further study should be carried out about QCT to measure mandibular bony density using QCT.

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Effect of Cortical Bone on Acoustic Properties of Trabecular Bone in Bovine Femur In Vitro (생체 외 조건의 소 대퇴골에서 해면질골의 음향특성에 대한 피질골의 효과)

  • Hwang, Kyo Seung;Lee, Kang Il
    • The Journal of the Acoustical Society of Korea
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    • v.32 no.2
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    • pp.181-189
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    • 2013
  • The purpose of the present study is to investigate the effect of cortical bone on acoustic properties of trabecular bone, such as speed of sound (SOS) and normalized broadband ultrasound attenuation (nBUA), in bovine femur in vitro. Twelve trabecular bone samples and three cortical bone plates with thicknesses of 1.00, 1.47, and 2.00 mm were extracted from the proximal end of two bovine femurs. The correlations between acoustic properties and trabecular apparent bone density were also examined before and after attaching a cortical bone plate to the trabecular bone samples. SOS increased linearly with increasing thickness of the cortical plate attached to one side of ultrasonic incidence of the trabecular bone samples, whereas nBUA showed a nonlinear dependence on the thickness of the cortical plate. All the SOS (r = 0.95-0.97) and nBUA (r = 0.53-0.73) measurements with and without the cortical bone plate with various thicknesses were found to exhibit high correlations with the trabecular apparent bone density. These results imply that the acoustic properties measured in the femur with lateral cortical layers in vitro can be useful indices for the prediction of trabecular bone mineral density.

ILIAC BONE GRAFT REPLACING TANTALUM PLATE FOR GUNSHOT WOUND OF MANDIBLE (총상으로 인한 하악골 결손 부위의 Tantalum plate 대치를 위한 장골이식에 관한 증례)

  • Kim, Soo-Nam;Lee, Bong-Zae;Han, Bo-Kuoon
    • The Journal of the Korean dental association
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    • v.15 no.5
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    • pp.359-364
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    • 1977
  • Orthognathic surgery, ie, the surgical correction of congenital and acquaired anormalities of the jaws, is currently a field of vigorous activity among oral surgeons. Surgical correction of maxillofacial deformities benefits the patient both psychologically and functionally. Facial mutilation may precipitate adverse psychologic effects. Function is frequently impaired by malrelation of the jaws. In addition, speech, specifically articulation, is often handicapped in patient with severe jaw deformities. Therefore, in dealing with these patient, above mentioned problem should be considered deliberately. In this regard, the authors have treated 2 cases of mandible defect caused by gunshot and explosives with iliac bone graft. In both cases, the patient had Tantalum plate on defect area. But it became lose and gave functional disturbances. So, the authors have removed Tantalum plate and performed bone transplantation with autogenous soild iliac bone graft on that area with good results.

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One-Stage Treatment of Chronic Calcaneal Osteomyelitis with Bone Morphogenetic Protein 2 and Local Antibiotic Delivery in a Cat

  • Kim, Hyungkyoo;Jeong, Heejun;Park, Chul;So, Kyung-Min;Park, Jiyoung;Jeong, Seong Mok;Lee, Haebeom
    • Journal of Veterinary Clinics
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    • v.33 no.5
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    • pp.300-303
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    • 2016
  • An age-unknown, 4.8 kg, male, wild, domestic short-hair cat was presented for left hindlimb lameness. A physical examination revealed a draining tract which was suspected of bite on left calcaneal bone. The left tarsal joint was markedly swollen and exudates were observed around the draining tract. Sequestrum at left calcaneus bone, and osteolysis were identified by radiography. The sequestrum and its surrounding exudative tissue were debrided during surgery and the tissue was submitted for bacterial culture and sensitivity test. The debridement caused a bone defect ($1.5cm{\times}0.5cm{\times}0.5cm$) on the medial left calcaneal bone. Plate and screw fixation was performed to the calcaneus bone as buttress plate. Recombinant human bone morphogenetic protein-2 (rhBMP-2) loaded hydroxyapatite was implanted in the bone defect. Furthermore, Amikacin-impregnated collagen sponges were also placed around bone plate to deliver local antibiotics. A systemic antibiotic treatment regimen based on bacterial culture and sensitivity test results was administered for 4 weeks. The wound properly healed without any signs of infection, and the bone healing was confirmed by radiography. The patient showed normal weight bearing ambulation at 18 weeks after surgery. The use of rhBMP-2 and local antibiotic delivery system is a good surgical option for the one-stage treatment of chronic osteomyelitis.