• 제목/요약/키워드: acetabulum

검색결과 48건 처리시간 0.027초

유한요소법을 이용한 인공 고관절의 접촉응력 해석에 관한 연구 (A Study on the Contact Stress Analysis of the Artificial Hip Joint Using Finite Element Method)

  • 김청균;윤종덕
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1996년도 제24회 추계학술대회
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    • pp.189-194
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    • 1996
  • The modern orthopaedics frequently uses the total hip replacement in the artificial hip joint. The wear in this joint requires the re-replacement of the hip joint beacuse it is under the severe load and friction conditions. To solve these problems the previous studies have been mainly focused on the development of the new materials. The research of new material, however, needs much time and effort since it should be experimented for its bio-compatibility, friction, and wear characteristics. To reduce the work, in this study, the finite element analysis is applied to find the new combination of the materials in the total hip replacement which has the excellent contact characteristics. The finite element uses MARC and the 5-node aximetric element. The results show that in case of acetabulum UHMWP has good characteristics, in femoral head, the $Al_2O_3$, and in stem, Ti6Al4V.

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Numerical analysis of crack propagation in cement PMMA: application of SED approach

  • Ali, Benouis;Abdelkader, Boulenouar;Noureddine, Benseddiq;Boualem, Serier
    • Structural Engineering and Mechanics
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    • 제55권1호
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    • pp.93-109
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    • 2015
  • Finite element analysis (FEA) combined with the concepts of linear elastic fracture mechanics (LEFM) provides a practical and convenient means to study the fracture and crack growth of materials. In this paper, a numerical modeling of crack propagation in the cement mantle of the reconstructed acetabulum is presented. This work is based on the implementation of the displacement extrapolation method (DEM) and the strain energy density (SED) theory in a finite element code. At each crack increment length, the kinking angle is evaluated as a function of stress intensity factors (SIFs). In this paper, we analyzed the mechanical behavior of cracks initiated in the cement mantle by evaluating the SIFs. The effect of the defect on the crack propagation path was highlighted.

대퇴골두 무혈성괴사의 치료에서 전방 회전 절골술의 조기 추시 결과 (The Early Result of Anterior Rotational Osteotomy in the Treatment of Osteonecrosis of the Femoral Head)

  • 김세동;신덕섭;장우석
    • Journal of Yeungnam Medical Science
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    • 제11권2호
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    • pp.284-292
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    • 1994
  • 1992년 12월부터 1994년 6월까지 영남대학교 의과대학 부속병원 정형외과에 내원한 대퇴골두무혈성 괴사 환자 28명, 31 고관절에 대해 시행한 경전자간 회전 절골술의 결과는 다음과 같다. 1. 대상 환자는 한명을 제외하고는 모두 남자였으며, 평균 연령은 44.3세로 삼, 사십대가 대부분이었다. 2. 무혈성 괴사의 원인은 과다한 음주에 의한 것이 18례로 가장 많았고, 괴사의 정도는 Ficat와 Arlet의 분류에 의하면 II a가 16례로 가장 많았다. 3. 절골술 후 고정 방법으로는 screw가 15례, DHS가 16례였고, 고정 방법에 따른 대퇴경간각의 변화로는, screw를 사용한 경우는 술전에 비해 내반고 되는 경향을 보였고, DHS를 사용한 경우는 외반고 되는 경향을 보였다. 4. 술전 대퇴골두 측면 방사선 사진에서 측정한 대퇴골두 전체 관절면에 대한 건전한 관절면의 비는 1/3이하가 8례, 1/3 이상이 23례(74%)이었다. 5. 술후 고관절의 전후면 방사선 사진에서 측정한 비구의 체중 부하면에 대한 전위된 건전한 대퇴골두의 관절면 비는 36% 이상이 24례(78%), 21-35%가 6례, 20% 이하가 1례였다.

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개의 전배측 고관절 탈구에서 변형된 외골격 고정 적용 5례 (Modified External Skeletal Fixation for Craniodorsal Coxofemoral Luxation in 5 Dogs)

  • 정창수;임지혜;변예은;김완희;윤정희;권오경
    • 한국임상수의학회지
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    • 제24권4호
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    • pp.631-635
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    • 2007
  • Luxation of the hip is the most common luxation seen in small animals. Luxations are classified by the direction in which the femoral head lies in relation to the acetabulum and craniodorsal luxations are the most common type. Recommendations for treatment are based on the presence of preexisting disease, the type and duration of luxation and severity of concurrent injuries. In this study modified external skeletal fixation was used for craniodorsal coxofemoral luxation in 5 dogs. Luxated head Joint was reduced and fixator pins were applied into the greater trochanter, the middle point of iliac body and the lateral surface of sacroiliac joint in a closed fashion. Reduction was successful in 4 of the 5 operated limbs. Complications noted in this study included pin tract drainage, pin loosening and secondary fracture at the pin insertion site.

맞춤형 인공관절 설계를 위한 인체 고관절의 3차원 형상 정보 추출 (Extracting 3D Geometry Parameters of Hip Joint for Designing a Custom-Made Hip Implant)

  • 서정우;전용태
    • 한국CDE학회논문집
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    • 제13권3호
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    • pp.200-208
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    • 2008
  • Total Hip Replacement(THR) is a surgical procedure that replaces a diseased hip joint with a prosthesis. A plastic or metal cup forms the socket, and the head of the femur is replaced by a metal ball on a stem placed inside the femur. Due to the various types and shapes of human hip joint of every individual, a selected commercial implant sometimes may not be the best-fit to a patient, or it cannot be applied because of its discrepancy. Hence extracting geometry parameters of hip joint is one of the most crucial processes in designing custom-made implants. This paper describes the framework of a methodology to extract the geometric parameters of the hip joint. The parameters include anatomical axis, femoral head, head offset length, femoral neck, neck shaft angle, anteversion, acetabulum, and canal flare index. The proposed system automatically recommends the size and shape of a custom-made hip implant with respect to the patient's individual anatomy from 3D models of hip structures. The proposed procedure creating these custom-made implants with some typical examples is precisely presented and discussed in this paper.

소아에서 다발성으로 나타난 저등급 골육종 - 1예 보고 - (Multiple Low-grade Osteosarcoma in Children - A Case Report -)

  • 김태승;박용욱
    • 대한골관절종양학회지
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    • 제15권2호
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    • pp.171-177
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    • 2009
  • 저등급 골육종은 전형적 골육종에 비해 발생 빈도가 훨씬 드물고, 호발 연령도 전형적 골육종에 비해 높은 것으로 나타나 있다. 본 교실에서는 12세 여아에서 좌측 경골, 대퇴골 경부 및 간부, 그리고 좌측 비구에 발생한 다발성 저급성 골육종 1예를 경험하였다. 본 증례는 예외적으로 소아에 발생하였고, 그리고 다발성 소견을 나타내어 동시성(synchronous) 혹은 이시성(metachronous) 전이의 양상을 띠고 있었다. 더욱이 저급성 골육종은 일반적으로 느린 성장 과정을 보이기 때문에, 본 증례에서 보이는 전이의 양상에 대해서는 희귀하여 문헌고찰과 함께 보고하는 바이다.

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Efficacy of Intra-articular Steroid Injection in Patients with Femoroacetabular Impingement

  • Park, Jung Sun;Jang, Young Eun;Nahm, Francis Sahngun;Lee, Pyung Bok;Choi, Eun Joo
    • The Korean Journal of Pain
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    • 제26권2호
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    • pp.154-159
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    • 2013
  • Femoroacetabular Impingement (FAI) arises from morphological abnormalities between the proximal femur and acetabulum. Impingement caused by these morphologic abnormalities induces early degenerative changes in the hip joint. Furthermore, FAI patients complain of severe pain and limited range of motion in the hip, but a guideline for treatment of FAI has not yet been established. Medication, supportive physical treatment and surgical procedures have been used in the treatment of the FAI patients; however, the efficacies of these treatments have been limited. Here, we report the diagnosis and treatment for 3 cases of FAI patients. Intra-articular (IA) steroid injection of the hip joint was performed in all three patients. After IA injection, pain was reduced and function had improved for up to three months.

Effect of Complex Traditional Korean Medicine Treatment and Rehabilitation on Acetabular Fracture: A Case Report

  • Young Han Nam;Choong Hyun Han;Young Kyung Kim;Youn Young Choi;Eun Sol Won;Hwa Yeon Ryu;Hyun Lee;Jae Hui Kang
    • Journal of Acupuncture Research
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    • 제40권3호
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    • pp.272-280
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    • 2023
  • This report presents the clinical progress of a 50-year-old male diagnosed with a left acetabular fracture and left rib fracture after falling from a height of 3 m. The patient was treated nonsurgically and underwent complex traditional Korean medicine (TKM) treatment and rehabilitation, including acupuncture, electroacupuncture, pharmacopuncture, bee venom, herbal medicine, physiotherapy, and moxibustion. Patient progress was assessed using the numerical rating scale (NRS), manual muscle test (MMT), and modified Harris Hip Score (mHHS). During 113 days of hospitalization, the NRS score decreased from 7 to 3, and the MMT grade increased to normal in the hip, knee, and ankle joints. The mHHS score increased from 26 to 99 points. Radiographs and computed tomography scans of the left acetabulum were obtained periodically, and fracture union was successfully achieved. To our knowledge, this is the first case report of complex TKM treatment and rehabilitation of acetabular fractures.

Analysis of the Importance of Sacroiliac Joint Fractures as a Prognostic Factor of the Patients with Pelvic Fractures

  • Ju, Yeon-Uk;Cho, Jun-Min;Kim, Nam-Ryeol;Lee, Kyung-Bum;Kim, Jin-Kak;Oh, Jong-Keon
    • Journal of Trauma and Injury
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    • 제31권1호
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    • pp.6-11
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    • 2018
  • Purpose: The diagnosis of pelvic fractures pattern has become to be essential in the decision making of treatment modality and reducing morbidity and mortality in multiple trauma patients. Sacroiliac joint (SIJ) disruption can cause life-threatening massive arterial bleeding. This study aimed to determine a method of predicting the prognosis and treatment direction with pelvis X-ray alone in the emergency room. We investigated whether SIJ disruption can be used alone as a poor prognostic factor. Methods: We analyzed the medical records and radiologic examination results of 167 patients with pelvic fractures from January 1, 2015 to December 31, 2016 retrospectively. Patients with pathologic fractures, thoraco-abdominal bleeding, and acetabulum fractures and pediatric patients (n=63) were excluded. Factors related to the clinical manifestations and treatments, such as transfusion and surgery, were statistically compared. Results: The cross-sectional analysis showed that there was no correlation between SIJ injury and sex; there were statistically significant relationships between occurrences of shock, conjoined fractures, transfusion, and surgeries. The hospitalization period and partial thromboplastin time and prothrombin time values increased. The logistic regression analysis showed that when an SIJ injury occurred, blood transfusion and hypotension possibilities increased. Conclusions: When pelvic fractures occur near the SIJ, blood transfusion and shock possibilities increase. Physicians must be aware of the high severity and poor prognosis of such fractures when these are diagnosed in the emergency room. And furthermore, the physician has to predict and prepare the intensive care and multidisciplinary approaches.

Numerical modeless of the damage, around inclusion in the orthopedic cement PMMA

  • Mohamed, Cherfi;Smail, Benbarek;Bouiadjra, Bachir;Serier, B.
    • Structural Engineering and Mechanics
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    • 제57권4호
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    • pp.717-731
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    • 2016
  • In orthopedic surgery and more especially in total arthroplastie of hip, the fixing of the implants generally takes place essentially by means of constituted surgical polymer cement. The damage of this materiel led to the fatal rupture and thus loosening of the prosthesis in total hip, the effect of over loading as the case of tripping of the patient during walking is one of the parameters that led to the damage of this binder. From this phenomenon we supposed that a remain of bone is included in the cement implantation. The object of this work is to study the effect of this bony inclusion in the zones where the outside conditions (loads and geometric shapes) can provoke the fracture of the cement and therefore the aseptic lousing of the prosthesis. In this study it was assumed the presence of two bones -type inclusions in this material, one after we analyzed the effect of interaction between these two inclusions damage of damage to this material. One have modeled the damage in the cement around this bone inclusion and estimate the crack length from the damaged cement zone in the acetabulum using the finite element method, for every position of the implant under the extreme effort undergone by the prosthesis. We noted that the most intense stress position is around the sharp corner of the bone fragment and the higher level of damage leads directly the fracture of the total prosthesis of the hip.