• Title/Summary/Keyword: menisci

Search Result 41, Processing Time 0.034 seconds

MRI Diagnosis of the Tear Pattern of Menisci (반월상 연골판 파열 양상의 자기공명영상 진단)

  • Ahn, Jin Hwan;Ha, Chul Won;Ahn, Joong Mo;Kim, Sang Hyun
    • Journal of the Korean Arthroscopy Society
    • /
    • v.2 no.2
    • /
    • pp.151-154
    • /
    • 1998
  • In the diagnosis of the meniscal tear of the knee, the high accuracy of the MRI diagnosis is well-known, but the accuracy of the MRI in the diagnosis of the very pattern of the tear of menisci is not well-established. The purpose of this study is to give some informations to consider in the diagnosis and therapeutic planning of torn menisci. The authors performed a retrospective study comparing the MRI and arthroscopic findings of 141 knees which had undergone arthroscopic surgery from Mar. 1997 to Mar. 1998. The results are as follows. In the diagnosis of tear of the menisci, MRI had sensitivity of 91%, specificity of 96%, accuracy of 95%. The mismatch of the tear patterns of the menisci between MRI and arthroscopic findings was identified in 59%, especially high in flap tear(100%), complex tear(84%), peripheral tear(55%). In conclusion, MRI is very accurate in the diagnosis of the tear of menisci, but the tear patterns of the menisci cannot be accurately determined by MRI. In the cases of flap tears, complex tears and peripheral tears, it is more difficult to determine the tear patterns of the menisci by MRI. False-negative rate of MRI was especially high(44%) in the peripheral tear type. So, other clinical correlations should be made in determination of the presence of the tear in the diagnosis of peripheral tear of the menisci.

  • PDF

Geometry Effects of Capillary on the Evaporation from the Meniscus (모세관 단면 형상에 따른 계면 및 증발 특성)

  • Choi, Choong-Hyo;Jin, Songwan;Yoo, Jung-Yul
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.31 no.4
    • /
    • pp.313-319
    • /
    • 2007
  • The effect of capillary cross-section geometry on evaporation is investigated in terms of the meniscus shape, evaporation rate and evaporation-induced flow for circular, square and rectangular cross-sectional capillaries. The shapes of water and ethanol menisci are not much different from each other in square and rectangular capillaries even though the surface tension of water is much larger than that of ethanol. On the other hand, the shapes of water and ethanol menisci are very different from each other in circular capillary. The averaged evaporation fluxes in circular and rectangular capillaries are measured by tracking the meniscus position. At a given position, the averaged evaporation flux in rectangular capillaries is much larger than that in circular capillary with comparable hydraulic diameter. The flow near the evaporating meniscus is also measured using micro-PIV, so that the rotating vortex motion is observed near the evaporating ethanol and methanol menisci except for the case of methanol meniscus in rectangular capillary. This difference is considered to be due to the existence of corner menisci at the four comers.

Medial Discoid Meniscus - A Report of Two Patients - (내측 원판형 연골 - 2명 보고 -)

  • Koh, Hae Seok;Park, Beom Seok;Choi, Seing Pil;Kang, Do Jun
    • Journal of the Korean Arthroscopy Society
    • /
    • v.16 no.1
    • /
    • pp.60-65
    • /
    • 2012
  • Although the lateral discoid meniscus has been observed frequently, the medial discoid meniscus is an extremely rare anomaly. The incidence of lateral discoid menisci ranges from 1.4% to 15.5% and the incidence of medial discoid menisci ranges from 0.06% to 0.3%. We present 1 patient of bilateral medial discoid menisci with tear on left side and 1 patient of unilateral medial discoid meniscus with tear, that were diagnosed by magnetic resonance imaging (MRI) and arthroscopy. We performed partial meniscectomy on 2 cases of symptomatic medial discoid menisci under arthroscopy and meniscus-related symptoms were relieved. We report 3 cases of 2 patients with medial discoid meniscus.

  • PDF

Biomechanical evaluation of menisectomy using finite element method (유한요소 해석법을 이용한 반월상 연골 절제술의 생체역학적 평가)

  • Bae, Ji-Yong;Park, Jin-Hong;Song, Eun-Kyoo;Park, Sang-Jin;Jeon, In-Su
    • Proceedings of the KSME Conference
    • /
    • 2008.11a
    • /
    • pp.1471-1472
    • /
    • 2008
  • To analyze biomechanical effects of various types of menisectomy in the knee joint, the contact area and pressure distribution of intact the knee joint and the operated by various menisectomies were studied by using finite element method their results are compared with each other. In this study, the femur, the tibia, the articular cartilage and the menisci were three dimensionally reconstructed using MR Images of healthy knee joint in full extension of 26 years old male. Also, three dimensional finite element model of the knee joint was constructed including the models of ligaments and tendons on the reconstructed three dimensional model. Bones were considered to be rigid, articular cartilage and menisci were considered as homogeneous, isotropic and linearly elastic materials and ligaments and tendons were modeled as hyperelastic materials. Based on the results, the effects of various types of menisectomy on the knee joints are clearly elucidated.

  • PDF

Microvasculature of Human Menisci (정상 반월상 연골의 혈관 분포)

  • Kim Sang Hoon;Cho Hong Sik;Lee Han Young;Lee Ki-Bum;Min Byung-Hyun
    • Journal of the Korean Arthroscopy Society
    • /
    • v.7 no.1
    • /
    • pp.52-57
    • /
    • 2003
  • Purpose : To evaluate the morphologic measurement and microvasculature of the normal human meniscus in Korean and to compare the difference of microvasculature according to the age and anatomical location. Materials and methods : Menisci of 21 cadavers divided into 3 groups according to the age. Each meniscus was divided into 10 parts of which the width and area of microvasculature were measured. Results : The average width of the medial and lateral menisci were $10.49{\pm}02.92mm$ and $10.55{\pm}2.05mm$, respectively. The average area of the microvasculature measured $20.29{\pm}8.44\%$ in the medial meniscus and $18.99{\pm}7.03\%$ in the lateral meniscus. The microvasculature of the medial meniscus was most abundant in the anterior horn and least abundant in the posterior horn (p<0.05). The lateral meniscus showed the most vessels in the posterior horn (p<0.05). The microvasculature of popliteal hiatus was not avascular but hypovascular. The area of microvasculature decreased with increasing age in all parts of the medial meniscus and body and posterior horn of the lateral meniscus (p<0.05). Conclusion : Differences in the anatomical distribution of the vessels were noted of both the medial and lateral menisci. The area of microvasculature generally decreased proportionally with increasing age in both medial and lateral meniscus.

  • PDF

Meniscal Repair with Meniscal Arrows (반월상연골 화살을 이용한 반월상연골 봉합술)

  • Kim Jung-Man;Oh In-Soo
    • Journal of Korean Orthopaedic Sports Medicine
    • /
    • v.1 no.2
    • /
    • pp.124-130
    • /
    • 2002
  • Purpose: The results of meniscal repair of peripheral tear of meniscus with meniscal arrow was analysed. Materials and Methods: Peripheral tears of posterior 1/2 of menisci of 25 cases including 18medial, 6 lateral and 1 both menisci were repaired with meniscal arrows. One to six meniscal arrows were used for each meniscus according to the length of tears. Concurrent tears of ACL were noted in14 cases. The follow-up period was 3.4 years in average. The findings of physical examination and MRI which were taken once or twice in 1$\~$5 years after operation were evaluated. Results: Healing of the tear was achieved in all cases. However, a vertical longitudinal tear of body occurred in two medial menisci along the line of insertion of arrows. An arrow migrated subcuta-neously in two cases, respectively. Conclusions: The meniscal arrow was effective in the treatment of the peripheral tear of menicus. However, there was a chance of occurrence of longitudinal tear of the meniscus in case of insertion of arrows in a row. Migration of the arrow may occur.

  • PDF

Failure Study for Knee Joint Through 3D FE Modeling Based on MR Images (자기공명영상 기반 3차원 유한요소모델링을 통한 무릎관절의 파손평가)

  • Bae, Ji-Yong;Park, Jin-Hong;Song, Seong-Geun;Park, Sang-Jin;Jeon, In-Su;Song, Eun-Kyoo
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.22 no.6
    • /
    • pp.533-539
    • /
    • 2009
  • In this study, the femur, the tibia, the articular cartilage and the menisci are three dimensionally reconstructed using MR images of healthy knee joint in full extension of 26-year-old male. Three dimensional finite element model of the knee joint is fabricated on the reconstructed model. Also, the FE models of ligaments and tendons are attached on the biologically suitable position of the FE model. Bones, articular cartilages and menisci are considered as homogeneous, isotropic and linear elastic materials, and ligaments and tendons are modeled as truss element and nonlinear elastic springs. The numerical results show the contact pressure and the von Mises stress distribution in the soft tissues such as articular cartilages and menisci which can be regarded as important parameters to estimate the failure of the tissues and the pain of the patients.

Simultaneous Medial and Lateral Discoid Meniscus in one Knee joint (한쪽 슬관절에서 내측 및 외측에 동시에 발생한 원판형 연골 - 1예 보고 -)

  • Cho, Young-Ho;An, Hyug-Su;Chang, Se-Ang;Nam, Seung-Oh
    • Journal of the Korean Arthroscopy Society
    • /
    • v.10 no.1
    • /
    • pp.95-98
    • /
    • 2006
  • Most of discoid menisci are lateral and medial discoid meniscus is very rare. There is no report about simultaneous medial and lateral discoid meniscus in one knee joint. A 15-year-old male patient was diagnosed as having a complete medial discoid meniscus with horizontal tear and intact incomplete lateral discoid meniscus by means of magnetic resonance image and arthroscopy. The patient was treated by arthroscopic partial meniscectomy for both discoid menisci.

  • PDF

Treatment Principles of Anterior Cruciate Ligament Injury (전방십자인대 손상의 치료 원칙)

  • Ha, Kwon-Ick
    • Journal of the Korean Arthroscopy Society
    • /
    • v.1 no.1
    • /
    • pp.36-40
    • /
    • 1997
  • Anterior Cruciate Ligament (ACL) plays an important biomechanical role for the stability of knee joint. ACL injury often leads to injuries of articular cartilage, menisci, or other supporting structures, and subsequent development of degenerative arthritis. Controversies still exist in the best treatment modalities of ACL injuries. hut the author considers it most important to make the appropriate patient selection for operative reconstruction or nonoperative treatment. and describes the treatment principles of ACL injury, including diagnosis, patient selection and the treatment modalities for successful treatment of ACL injury.

  • PDF

Histological studies on the development of the stifle joint in Korean cattle (한우의 무릎관절 발생에 관한 조직학적 연구)

  • Paik, Young-ki;Lee, Han-kyoung;Yang, Hong-hyun;Kim, In-shik
    • Korean Journal of Veterinary Research
    • /
    • v.33 no.1
    • /
    • pp.7-21
    • /
    • 1993
  • The morphogenesis of the stifle joint in Korean cattle embryos and fetuses was observed by radiography, alizarin red S stain and light microscopy. Fourty-eight(48) embryos and fetuses, ranging from 11mm to 160mm in crown-rump length (C-R L), were used for this study. The experimental samples were divided into twelve separate groups according to their C-R L. The first to the nineth group ranged from 11-100mm in C-R L, spaced at 10mm intervals. The tenth to the twelfth group ranged in C-R L from 101mm to 160mm, and were spaced at 20mm intervals. The results were as follows; 1. The first appearance of the interzone between the femur and tibia was formed in the second experimental group. The patellar ligament and cruciate ligament appeared in the third group and the patella, menisci and synovial cavity appeared in the fourth group. 2. The lateral and medial menisci were first obseved in the fourth group, and these structures showed crescent shape in the fifth group of the fetuses. 3. The first appearance of the femoro-tibial joint cavity was in the third group. The fifth group contained the first appearance of the patello-femoral cavity. Also, the femoro-tibial cavity was divided into two cavities by the anterior and posterior cruciate ligament.

  • PDF