• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.18 no.3
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• pp.321-327
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• 2009

This paper studied the influences of the main design parameter-the expansion angle and the material properties of the self-expansion anterior cruciate ligament fixation device on the contact condition with the bone and the initial stability of the device. Using finite element analysis, the stress distributions of the ring part of the device and the wall of the bone tunnel were calculated. And the micro-migration of the device by the pull-out force was calculated. From the analysis results, it was found that when designing the self-expansion type anterior cruciate ligament fixation device, it is desirable to use the material having higher Young's modulus and to design the fixation device that all wedges uniformly maintain contact with bone to obtain initial stability after operation.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1933-1936
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• 2005

The isometric area of the anterior cruciate ligament was calculated during knee flexion-extension. Flexion-extension motion data of the joint were obtained using Fastrak and a three-dimensional motion measurement system. A total of five subjects were seated on a flat table and the tibia sensor position was measured with the femur fixed on the table. A three-dimensional knee model was constructed using a graphic tool to simulate the knee motion. Twenty seven positions of the tibia region and forty two positions of the femur region were selected and the distances between the determined tibial and femoral points were calculated. Highly isometric areas were found and displayed as three dimensional aspects.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.158-161
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• 2004

The isometric position of the anterior cruciate ligament was calculated during flexion-extension. Flexion-extension motion data of the knee joint were obtained by Fastrak, a three-dimensional motion measurement system. A subject was seated on a flat table and the tibia sensor position was measured with the femur fixed at the table. A three-dimensional knee model was constructed using a graphic tool to simulate the knee motion. Three surgical positions of the femoral tunnel were selected and the distances between the determined tibial tunnel and each femoral tunnel were calculated. The maximum elongation position was found to be in the ten thirty direction of clock.

• Journal of the Korean Society of Radiology
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• v.13 no.3
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• pp.391-398
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• 2019

The purpose of study is to investigate the difference of the daN force applied during the examination using Telos Device and the degree of fluctuation of anterior cruciate ligament according to the individual differences of the muscles involved in knee stability. The examination was done by the Lachman test using Telos Device and the changes of anterior cruciate ligament were measured by varying the force of 0. 15, 30 daN on each right and left side and the force of 30 daN after the bruce protocol. Computed tomography (CT) was used to measure muscle mass. As a result of measuring the degree of fluctuation of the anterior cruciate ligament according to the change of the force applied to the Telos Device, there was a statistically significant difference in the knee fluctuation when 15 daN and 30 daN were applied on both right and left. Also, it is analyzed that the degree of fluctuation of anterior cruciate ligament varies according to the difference of individual's muscle mass. Therefore, it is considered that the force applied to the Telos Device should be changed according to the difference of individual's muscle mass.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.30 no.4 s.247
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• pp.457-464
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• 2006

The anterior cruciate ligament (ACL) is liable to a major injury that often results in a functional impairment requiring surgical reconstruction. The success of reconstruction depends on such factors as attachment positions, initial tension of ligament and surgical methods of fixation. The purpose of this study is to find isometric positions of the substitute during flexion/extension. The distance between selected attachments on the femur and tibia was computed from a set of measurements using a 6 degree-of-freedom magnetic sensor system. A three-dimensional knee model was constructed from CT images and was used to simulate length change during knee flexion/extension. This model was scaled for each subject. Twenty seven points on the tibia model and forty two points on the femur model were selected to calculate length change. This study determined the maximum and minimum distances to the tibial attachment during flexion/extension. The results showed that minimum length changes were $1.9{\sim}5.8mm$ (average $3.6{\pm}1.4mm$). The most isometric region was both the posterosuperior and anterior-diagonal areas from the over-the-top. The proposed method can be utilized and applied to an optimal reconstruction of ACL deficient knees.

• Journal of the Korean Arthroscopy Society
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• v.2 no.1
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• pp.64-67
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• 1998

A ganglion cyst is a soft tissue mass that is surrounded by a dense connective-tissue capsule. The capsule is filled with a viscous fluid that is rich in hyaluronic acid and other mucopolysaccharides. But, Ganglion cysts in the knee joint are rare. There are very few case reports of ganglion cysts related to the surface of the anterior cruciate ligament, Posterior cruciate ligament and medial meniscus. We are reporting a case of a ganglion cyst in the anterior aspect of the anterior cruciate ligament accompanying with discoid lateral meniscus in the right knee of a 46-year-old woman without any history of trauma. The cyst and discoid lateral meniscus were treated successfully with arthroscopic excision and partial meniscectomy.

• Journal of the Korean Arthroscopy Society
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• v.14 no.2
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• pp.124-127
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• 2010

Pretibial ganglion cyst after arthroscopic anterior cruciate ligament reconstruction is a very rare complication, and a few are reported in and outside the country. Some authors report that it may break out with a variety of causes at any time. We experienced a case of pretibial ganglion cyst after arthroscopic anterior cruciate ligament reconstruction using Achilles tendon allograft and bioabsorbable interference screw in 34-year-old male. So we report this case including the cause and the treatment with a review of the literature.

• Journal of the Korean Society of Physical Medicine
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• v.7 no.3
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• pp.251-258
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• 2012

Purpose : The purpose of this study is to provide an efficient and basis for muscle activity of Quadriceps muscles and balance in anterior cruciate ligament reconstruction patients through unstable surface exercise and stable surface exercise. Methods : This study included 30 anterior cruciate ligament reconstruction patients belonging to A hospital and D orthopedic surgery clinic of province who attended the program for 30 minutes at a time and three times a week for 4 weeks. Of these 15 attended the unstable surface exercise program and 15 the stable surface exercise program. To increase muscle activity (%MVIC) and balance (WPL), the unstable surface exercise. Results : The %MVIC of lower extrmity muscle(RF, VL, VM) increased from before training to after training in the case of the participants who performed the unstable surface exercise, and the whole path length (WPL) decreased from before the training to after the training(p<.05). Conclusion : In conclusion, unstable surface exercise program helps to improve the balancing ability and musle activity in a anterior cruciate ligament recunstruction patients who requires both muscle activity and balance than stable surface exercise program.

• Journal of the Korean Arthroscopy Society
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• v.13 no.2
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• pp.111-114
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• 2009

Double-bundle anterior cruciate ligament reconstruction (DBACLR) has been developed to produce better clinical outcomes in traditional single-bundle reconstruction, which showed considerable rate of dissatisfaction in restoration of stability and function of the anterior cruciate ligament deficient knee. There is plenty of evidence that DBACLR has theoretical advantages in anatomical, biomechanical, biological, kinematical, and possibly clinical standpoint compared with traditional one but still a lack of available clinical outcome studies with sufficient follow-up to demonstrate the substantial advantages of DBACLR. The purpose of this article is to review the clinical outcomes of double-bundle technique and to address controversy exists over the usefulness of this technique.

• Journal of the Korean Arthroscopy Society
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• v.1 no.1
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• pp.55-62
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• 1997

Various surgical techniques has been advocated for reconstruction of anterior cruciate ligament using the bone-patella tendon-bone graft. Recently endoscopic technique provides good clinical results, with minimal skin incision, accurate positioning of the graft to the femoral tunnel, and decreasing wear rate of the graft. But the graft-tunnel mismatch remains problematic in endoscopic technique. The purpose of this paper is to described causes of the graft-tunnel mismatch and to provide important steps to prevent or minimize the graft-runnel mismatch following anterior cruciate ligament while using the endoscopic technique. Our guideline for prevention of the graft-tunnel mismatch are as follows: (1) The tunnel should he positioned closely to isometric point as much as possible. (2) Anterior placement of the tunnel should be avoided. (3) The change of graft length should be within 2mm between flexion and extension position.