• Journal of Korean Orthopaedic Sports Medicine
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• v.10 no.2
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• pp.47-53
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• 2011

Purpose: As the number of the anterior cruciate ligament (ACL) reconstruction has increased, the incidence of revision of ACL reconstruction due to reconstruction failure has been also increased. Therefore, authors analyzed the reason of the failure of ACL reconstruction and the clinical result of the ACL revision. Materials and methods: From February 1998 to July 2010, we selected 36 cases which was followed at least 12months after the ACL reconstruction failure. Duration from reconstruction to revision, the average duration was 60 months (5~334) and on first reconstruction, we used allograft on 23 cases (63.9%) and autograft on 13 cases (36.1%). For the main symptom of ACL reconstruction failure, instability was the most common symptom, and 35 cases (97.5%) were undergone only one reconstruction and 1case (2.5%) was undergone two reconstruction. Clinical results were evaluated by Lysholm knee joint score, pivot shift test, and Telos device. Results: Average follow-up duration of the patients was 21 months (12~40), and the reason for the ACL reconstruction failure, trauma was most common by 19 cases (52.8%), malposition of the femoral tunnel was 13 cases (36.1%), malposition of the tibia tunnel was 1case (2.8%), and failure of osteointegration was 3 cases (8.4%). On performing the ACL revision, we used allograft on 34 cases (94%) and autograft on 2 cases (6%), and 21 cases accompanied injury of the meniscus (medial meniscus 14 cases, lateral meniscus 7 cases). Lysholm knee joint score was improved from 66.5 points, preoperatively to 92 points on last follow-up (p<0.01). In most cases, patients were satisfied (92%) with the operation results. Tegner activity score was also improved from 2.0 points preoperatively to 6.2 points on the last follow-up. On Lachman and pivot sift test, 33 cases and 30 cases were improved to grade I respectively, and on stability test using Telos device, the bilateral difference was improved from mean 15.5 mm preoperatively to 4.5 mm on the last follow-up. Conclusion: After 1 year follow-up, Revision of ACL had a little anterior instability but it showed satisfactory result on clinical result and patient's subjective satisfaction.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.11 no.1
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• pp.74-91
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• 2005

척추의 기본적인 생체 역학적 기능은 신체 부분간의 운동을 허용하고 척수와 신경근을 보호하는 것으로서 이러한 기능을 수행하기 위해서는 척추의 역학적 안정성이 필수적이다. 척추의 안정체계는 수동적 근 골격계, 능동적 근 골격계, 그리고 신경계의 세 가지 하부체계로 나누어지며 이들 하부체계는 각각 독립적으로 안정성에 관여하고 있다. 경추의 불안정성의 문제는 비정상적으로 증가된 추간관절의 운동에 의해 염증성의 신경을 압박 또는 신장하거나 또는 통증수용기가 많이 분포하는 인대, 관절낭, 섬유륜과 종판에 비정상적인 변형을 일으키는 것을 말한다. 안정성의 장애는 근육의 기능적 측면에서 국소적 안정체계와 포괄적 안정체계의 문제로 구분할 수 있다. 불안정한 경추 환자의 임상적 양상은 일반적으로 머리가 앞으로 나오고 전방 전위된 자세로 견갑대와 승모근 상부의 과활동성을 나타낸다. 또한 능동운동은 감소되지 않으나 수동운동에서 분절의 회전운동과 병진운동의 증가와 종말감의 변화가 있다. 경추의 불안정성을 관리하기 위한 실험적 연구로 전반적인 근육 훈련, 고유수용기 훈련, 그리고 도수치료의 세 가지 주된 접근법이 있고 실제적인 접근법으로는 고유수용성 재활프로그램, 칼텐본-에반스 접근법, 그리고, 슬링운동법 등이 있다. 각 방법들은 임상에서 나름대로의 이점이 있으며 환자의 상태에 따라 이들 방법을 단독으로 또는 병행해서 적용할 수 있을 것이다. 그러나 경추에서 이러한 방법들의 효과를 입증하는 증거는 부족하여 앞으로 이러한 방법에 대한 임상적 경험보다는 그 효과를 입증할 수 있는 연구가 필요하다고 본다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2012.05a
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• pp.81-85
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• 2012

In this paper, the typical combustion instabilities in hybrid rocket were studied. To induce combustion instabilities in the combustor with the diaphragms were mounted, on front and rear of the fuel, and combustion experiments were performed. The calculated theoretical frequencies using Longitudinal Acoustic Mode and Helmholtz Mode are compared with experimental frequencies using FFT analysis. The theoretical calculated results showed good agreements with experimental results are compared.

• Journal of Korean Orthopaedic Sports Medicine
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• v.2 no.1
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• pp.71-76
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• 2003

We evaluated biceps pulley as a stabilizing sling for the long head of biceps tendon in the rotator interval. We present 3 cases of detached biceps pulley which impinges on posterosuperior glenoid labrum in the position of late cocking. Pulley impingement related to anterior shoulder instability was relieved after Bankart repair. In another two cases, impingement symptoms were disappeared after resection of the detached biceps pulley.

• Journal of Korea Entertainment Industry Association
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• v.14 no.8
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• pp.245-253
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• 2020

This study has conducted to investigate the changes in the mobility of the three thoraco-abdominal lines(TAMs) during breathing and in the thoracic and lumbar spine mobility(TSM, LSM) during trunk forward flexion, after breathing pattern correction. The 30 subjects with lumbar instability(LI) have divided into the breathing pattern correction exercise(BPC) group of 15 subjects and the lumbar stabilization exercise(LSE) group of 15 subjects and performed each exercise for 40 minutes at one session, and a total of 18 sessions were applied for 6 weeks. As a result, The BPC group during breathing showed a significant increase in all TAMs(p<.001) and in the TSM(p<.001) than the LSE group. Besides, had a more decrease in the LSM than the LSE group(p<.001). The BPC showed high positive correlations with TAMs(rest: r=.868, forced: r=.870) and the TSM(r=.672) and had a negative correlation with the LSM(r=-.420). Based on this result of the study, the authors believe that the BPC in LI people could decrease the lumbar flexion mobility when they have motion of trunk forward flexion with promotions in the thoracic spine and rib joint mobility by improvements in relative mobility of thoraco-abdominal lines.

• Journal of the Korean Arthroscopy Society
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• v.9 no.2
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• pp.186-193
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• 2005

Purpose: To determine whether it is possible to differentiate between ALPSA(anterior labroligamentous periosteal sleeve avulsion) lesion and Bankart lesion using arthroscopic findings and to investigate the clinical significance of ALPSA lesion. Materials and Methods: This study was performed on 66 cases that underwent arthroscopic Bankart repair for the anterior instability of the shoulder. By the readings of MRI, there were 56 cases(85%) of Bankart lesion and ten cases(15%) of ALPSA lesion. Arthroscopic findings of Each cases were classified and their average follow-up period was 22 months. Results: It was observed that ALPSA lesions developed in younger age groups than Bankart lesions. Under the arthroscope, ALPSA lesions showed various forms, especially there were five cases of severe inferomedial displacements. Within Bankart lesion, 21 cases were observed to be severely displaced and from the arthroscopic findings, it was difficult to distinguish the difference of Bankart lesion cases displaced inferomedially from the neck of scapula without severe lateral displacements and ALPSA lesion. Regarding the recurrence, there were no redislocation but apprehension shows in two cases(20%) with severe inferomedial displacement in ALPSA group. In Bankart lesion, there were four recurrent cases(7.1%); one of redislocation; one case of subluxation; two of apprehension. Conclusion: It was difficult to differentiate Bankart lesion and ALPSA lesion with severe inferomedial displacement and severely displaced ALPSA lesion showed high rate of recurrence. Thus, complete detachment of ALPSA lesion should be performed more carefully to reduce the recurrence rate.

• Journal of the Korean Arthroscopy Society
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• v.13 no.2
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• pp.143-148
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• 2009

Purpose: To investigate the causes of failure on ACL reconstructions and evaluate the effectiveness of one stage revision ACL reconstructions. Materials and Methods: From November 2004 to July 2008, thirty three patients who had got revision ACL recontstructions after reruptures of ACL were evaluated. The causes of failure of ACL reruptures were 22 vertical femoral tunnels, 7 neglected PLRI, 3 severe traumas and 1 deep infection after ACL reconstruction. The femoral tunnels were aimed at the 10 or 2 o'clock position and the tibial tunnels were used with previous tunnels. Previous femoral screws from the improper femoral tunnels were removed and filled with the new allograft bones. Results: The average periods of follow up were 22.2 months (12~52 months). There was improvement on an average Lysholm knee score from $61.5{\pm}16.8$ to $86.3{\pm}11.5$, IKDC score from $63.9{\pm}15.1$ to $81.3{\pm}14.3$. Mean side to side difference was decreased from $6.0{\pm}2.2\;mm$ to $1.6{\pm}1.4\;mm$ using KT-2000 arthrometer. Conclusion: One stage revision ACL reconstruction can be a useful method with good clinical results.

• Journal of the Korean Arthroscopy Society
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• v.12 no.2
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• pp.91-92
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• 2008

후방십자인대 및 후외측인대 재건술 후 결과는 많은 발전이 있었지만, evidence medicine의 측면에서 재활 방법에 관한 전향적 연구는 없다. 현재까지의 재활 방법은 다양하게 소개되었지만 전방십자인대 재건술처럼 가속 재활을 하는 것은 바람직스럽지 않다. 후방십자인대, 후외측인대 그리고 다발성 인대 재건술 후 재활은 수술 방법과 환자의 재건된 인대의 상태, 하지 정렬 등에 따라서 개별화하여 점진적으로 진행하여야 할 것이고, 재활기간 동안 의사의 세심한 관찰이 필요하다.

• Journal of the Korean Arthroscopy Society
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• v.14 no.3
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• pp.169-174
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• 2010

대다수의 견관절 전방 불안정성에서 관절와에 골 소실이 큰 경우는 Bankart 복원술을 튼튼하게 하였을지라도 상완골두를 지탱할 관절 궁이 감소되어 골에 의한 버팀이 줄어들므로 Bankart 복원이 실패할 가능성이 높다. 따라서 관절와 결손이나 상완골 두 결손이 큰 경우 정확한 측정으로 결손의 범위를 파악하여야 하며, 관절와 결손이 25% 이상이거나 상완 골 두 결손이 30% 이상인 경우 추가적인 수술적 처치가 요하여 최근 보고되고 있는 Latarjet 술식이나 관절경적 Remplissage 술식을 시행하는 것이 바람직하다.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2009.03a
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• pp.224-224
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• 2009

견관절 전방 외상성 불안정증에서 관절 낭-순 재건술은 재발성 불완정증 예방 및 기능 회복에 있어 매우 성공적인 술식이다. 그러나 관절 와의 30 % 이상의 심한 골 결손이 존재 할 때 관절 낭-순 재건술 만으로는 성공적인 결과를 가져오기 힘들다. 본 연구는 관절 와의 심한 골 결손을 가진 재발성 전방 외상성 불안정성 견관절에서 관절외 자가 장골 이식으로 보강한 관절 낭-순 재건술의 술기와 결과를 보고하고자 한다.