• Journal of Acupuncture Research
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• v.19 no.6
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• pp.221-233
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• 2002

Background and Purpose : MRI(Magnetic Resonance Imaging) has become one of the most sensitive diagnostic tool no evaluate problems of the knee, because it enables us to identify not only osseous tissue but also soft tissues including muscle, fascia, tendon, ligament, meniscus and fat around the knee joint. Objective : To compare between MRI reading and pain, duration, physical examination in patients with pain of knee joint. Methods : 20 patients with pain of knee joint included in this study. This study researched pain-degree, duration, physical examination with pain of knee joint. Using MRI(Horizon Lx 1.0T-GE), we obtained the results. Results : 1. In the distribution of sex; Female rate was 80.0% and male rate was 20.0%. In the distribution of age, above sixty group was the largest group by each 55.0%. 2. In the distribution of MRI reading; 'Meniscus horm tear' was 70.0%, 'Osteoarthritis' was 55.5%, 'ACL partial tear' was 15.0%, 'Bone bruise at tibia, femur' was 15.0%. 3. Correlation between duration of pain and MRI reading showed that acute and subacute stage related various MRI reading, that chronic stage related 'Osteoarthritis' and 'Meniscus horn tear' by each 69.2%, 92.3%. 4. Correlation between pain and MRI reading showed that severe pain(GVI) related 'ACL partial tear, PCL partial tear' by each 100%, that mild pain(GII) related 'Osteoarthritis, Meniscus horn tear' by each 70.0%, 80.0%. 5. Correlation between physical examination and MRI reading showed that Drawer test related ACL partial tear by each 60.0%, that McMurray test related 'Meniscus horn tear' by each 75.0%. 6. Correlation between effect of treatment and MRI reading showed that 'Osteoarthritis, Meniscus horn tear' related good effect, that ACL partial tear related poor effect. Conclusions : These results suggest that acute and sever pain relate 'ACL partial tear, PCL partial tear', that chronic and mild pain related 'Osteoarthritis, Meniscus horn tear'. So it is responsibility to use MRI as a sensitive diagnostic tool in the knee problems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.6
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• pp.490-496
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• 2014

The thickness of knee joint cartilage causes most diseases of knee. Therefore, an articular cartilage segmentation of knee magnetic resonance imaging (MRI) is required to diagnose a knee diagnosis correctly. In particular, fully automatic segmentation method of knee joint cartilage enables an effective diagnosis of knee disease. In this paper, we analyze a well-known level-set based segmentation method in brain MRI, and apply that method to knee MRI with solving some problems from different image characteristics. The proposed method, a fully automatic segmentation in whole process, enables to process faster than previous semi-automatic segmentation methods. Also it can make a three-dimension visualization which provides a specialist with an assistance for the diagnosis of knee disease. In addition, the proposed method provides more accurate results than the existing methods of articular cartilage segmentation in knee MRI through experiments.

• Journal of radiological science and technology
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• v.33 no.2
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• pp.93-96
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• 2010

This study evaluates usefulness of the developed assistant device by taking projection of patellofemoral joint in emergency patients who were doubt posterior cruciate ligament injury in knee joint. The subjects of experiment were patients who visited Eul-Ji University Hospital due to knee injury from January 2006 to December 2006. Seventeen patients, who took the Knee post stress view, Knee merchant view, Knee Seo's view to use assistant device and Knee MRI. To make assistant device of $170{\times}50{\times}70\;cm$, we evaluated its usefulness by measuring posterior dislocation of tibia. Seo's view is more accurate to make judgment of posterior cruciate ligament injury than original knee post stress view. Interval difference of posterior dislocation of original knee post stress view is $6.17{\pm}3.04$ and Seo's view is $8.74{\pm}4.47$. The results show injury of patellofemoral joint, vertical fracture of patella and posterior cruciate ligament injury by taking a projection using Seo's view. Therefore, it is useful to take projection earlier than talometer and MRI in emergency patients who were doubt posterior cruciate ligament injury in knee joint.

• Journal of the Korean Arthroscopy Society
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• v.10 no.1
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• pp.108-111
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• 2006

We present a case of double medial plica that developed on right knee joint. There has been no documented case of double medial plica of the knee joint. In a general way, double medial plica syndrome is very difficult to diagnose because it does rarely develop and symptoms are non-specific or not present. It is difficult to distinguish between pain originating from the medial plica and from other internal derangement of the knee. This patient had symptoms including aggravating right knee pain with sitting position or knee flexion for 3 months. We performed MRI and arthroscopy for more accurate diagnosis. MRI T1, T2 images showed typical double medial plica and we had performed arthroscopic excision of symptomatic medial plica in right knee joint. Arthroscopic resection provided satisfactory relief of symptom.lasting and satisfactory relieve of symptom.

• The Korean Journal of Pain
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• v.36 no.2
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• pp.208-215
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• 2023

Background: To evaluate the feasibility, inter-reader reliability, and intra-reader reliability for various morphological features reported to be related to iliotibial band friction syndrome (ITBFS) on knee magnetic resonance imaging (MRI). Methods: A total of 145 patients with a clinical diagnosis and knee MRI findings consistent with ITBFS were included in the "study group" and 232 patients without knee pathology on both physical examination and MRI were included in the "control group". Various morphologic features on knee MRI were assessed including the patella shape, patella height, lateral epicondyle anterior-posterior (AP) width, lateral epicondyle height, ITB diameter (ITB-d), and ITB area (ITB-a). Results: Patients in the study group had significantly higher lateral epicondyle height (13.9 mm vs. 12.92 mm, P = 0.003), ITB-d (2.9 mm vs. 2.0 mm, P = 0.022), and ITB-a (38.5 mm² vs. 23.8 mm², P < 0.001) than the control group. ITB-a showed higher area under the curve index (0.849 with 74.1% sensitivity and 72.4% specificity at a 30.3 mm² cutoff) than ITB-d (0.710 with 70.8% sensitivity and 61.2% specificity at 2.4 mm cutoff) and lateral epicondyle height (0.776 with 72.4% sensitivity and 67.8% specificity at 13.4 mm cutoff). However, only the inter-reader agreement for ITB-a (intraclass correlation coefficient = 0.65) was moderate, while the agreements for other morphologic features were good or excellent. Conclusions: Lateral epicondyle height seems to be a reliable and feasible morphologic feature for diagnosis of ITBFS.

• Journal of the Korean Society of Radiology
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• v.81 no.1
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• pp.2-20
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• 2020

MRI is a valuable imaging technique for the evaluation of intraarticular diseases. Accurate interpretation of joint MRI necessitates sound knowledge of anatomy. In the field of joint anatomy, in addition to the discovery of new structures, previously reported joint components of unexplained function are also detected. In this review, joint anatomy researched actively over the last decade is discussed. Joint components including the rotator cable and the superior capsule of the shoulder, posterolateral corner and the anterolateral ligament complex of the knee, and the distal tibiofibular syndesmosis of the ankle joint are introduced and correlated with their MRI features.

• Journal of the Korean Arthroscopy Society
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• v.11 no.1
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• pp.13-19
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• 2007

Purpose: We investigated the natural history of acute, isolated posterior cruciate ligament injuries treated conservatively. Materials and Methods: Between February 1999 and October 2006, we evaluated retrospectively the results of acute, isolated posterior cruciate ligament injuries treated conservatively. The subjects consisted of 21 patients. At initial and follow up visits physical examination, $KT-2000^{TM}$ arthrometer and MRI were performed to assess improvement on the knee stability and continuity of the posterior cruciate ligament. IKDC (International Knee Documentation Committee) knee scoring and quadriceps muscle strength were also checked in all population. Comparing the results of initial and follow up examinations we assessed the natural history of acute, isolated posterior cruciate ligament injuries treated conservatively. The mean follow up period was 22.7 months. Results: The posterior drawer test showed 14 cases of Grade I, 6 cases of Grade II and 1 case of Grade III progressing 18 cases of Grade I and 3 cases of Grade II. The mean difference of 5.7mm by $KT-2000^{TM}$ arthrometer was changed Into 2.7mm and the continuity of posterior cruciate ligament initially checked by 48.1% on MRI increased to 69.7%. The mean quadriceps muscle strength was grade 'Good' and mean IKDC knee score was nearly grade 'A'. Conclusion: Our study suggests that patients with acute, isolated posterior cruciate ligament injuries treated conservatively may get good clinical outcomes on clinical situation and MRI.

• Journal of KIISE
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• v.42 no.10
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• pp.1222-1230
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• 2015

Segmentation of the anterior cruciate ligament (ACL) in knee MRI remains a challenging task due to its inhomogeneous signal intensity and low contrast with surrounding soft tissues. In this paper, we propose a multi-atlas-based segmentation of the ACL in knee MRI with locally-aligned probabilistic atlas (PA) in an iterative graph cuts framework. First, a novel PA generation method is proposed with global and local multi-atlas alignment by means of rigid registration. Second, with the generated PA, segmentation of the ACL is performed by maximum-aposteriori (MAP) estimation and then by graph cuts. Third, refinement of ACL segmentation is performed by improving shape prior through mask-based PA generation and iterative graph cuts. Experiments were performed with a Dice similarity coefficients of 75.0%, an average surface distance of 1.7 pixels, and a root mean squared distance of 2.7 pixels, which increased accuracy by 12.8%, 22.7%, and 22.9%, respectively, from the graph cuts with patient-specific shape constraints.

• Journal of the Korean Arthroscopy Society
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• v.2 no.2
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• pp.151-154
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• 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.

• Journal of Korea Society of Industrial Information Systems
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• v.20 no.3
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• pp.81-86
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• 2015

We fabricated a 3D knee joint model through the imaging processing. The 3D shape information is different depends on specific conditions when the shape of real knee joint is extracted from CT/MRI sliced images. The two types of joint models were fabricated by using 3D printer in order to analysis of joint movement by slight difference of 3D shape information. The compressive force experiments were performed by using knee joint model. As the results, the compressive forces were changed with respect to the difference of geometry. Consequently, feasibility test should be performed before developing biomimetic bioreactor.