• Journal of Korean Foot and Ankle Society
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• v.22 no.4
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• pp.145-150
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• 2018

High ankle sprain (distal tibiofibular syndesmosis injury) occurs from rotational injuries, specifically external rotation, and may be associated with ankle fractures. The prevalence of these injuries may be higher than previously reported because they may be missed in an initial examination. Syndesmosis injury can lead to significant complications in injured ankle joints, so a precise physical examination and radiological evaluation is necessary. The most important treatment goal is to have the tibia and fibula located in the correct position with respect to each other and to heal in that position. The methods to fix these injuries is controversial.

• The Korean journal of sports medicine
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• v.36 no.4
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• pp.173-179
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• 2018

A variety of theories have been reported as causes of shoulder pain in overhead throwing athletes. Recently, an explanation with microinstability of the shoulder and internal impingement has been proposed. The concept of the microinstability is that pathologic laxity of the anterior capsule caused by repeated abduction and external rotation of the shoulder leads to abnormal glenohumeral biomechanics and causes internal impingement of the shoulder. Based on the understanding of the pathology, it is recommended to identify the causes of shoulder pain in the overhead throwing athletes and perform appropriate rehabilitation or surgical treatment.

• Clinics in Shoulder and Elbow
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• v.24 no.1
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• pp.32-35
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• 2021

Angioleiomyoma is a benign soft tissue tumor originating from vascular smooth muscle. We report a case of a 20-year-old student who presented with pain in the right shoulder of 4 years duration. Shoulder movements were pain-free throughout the range of motion except resisted external rotation. Magnetic resonance imaging visualized a well-circumscribed lesion over the infraspinatus tendon. The lesion was surgically removed and sent for histopathological analysis. Morphology and immunohistochemistry results were suggestive of angioleiomyoma. The most common location for such a lesion is the lower limb, with less than 1% being reported in the upper arm, of which an angioleiomyoma of the shoulder is extremely rare.

• Advances in concrete construction
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• v.15 no.1
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• pp.47-61
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• 2023

This paper examines the dynamic response of rotating nanodevices under the external harmonic load. The spinning nanosystem is made of nanoscale tubes that rotate around the central nanomotor and is mathematically modeled via high-order beam theory as well as nonclassical nonlocal theory for the size impact. According to the Hamilton principle, the dynamic motion equations are derived, then the time-dependent results are obtained using the Newmark Beta technique along with the generalized differential quadratic method. The presented results are discussed dynamic deflection, resonant frequency, and natural frequency in response to the different applicable parameters, which help develop and produce nanoelectromechanical systems (NEMS) for various applications.

• Clinics in Shoulder and Elbow
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• v.27 no.1
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• pp.126-130
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• 2024

Anterior glenohumeral instability with an irreparable subscapularis tear is a challenging problem for the orthopedic shoulder surgeon. Current techniques, including tendon transfers, yield inconsistent results with high rates of recurrent instability. Acellular dermal allografting has been used in young patients with massive superior rotator cuff tears with early success, but acellular dermal allografting is comparatively unstudied in anterior deficiency. We present two cases of anterior capsular reconstruction with an acellular dermal allograft in patients ages 66 and 58 years with irreparable subscapularis tendon tears. Follow-up for both patients exceeded 4 years, with forward flexion >140°, external rotation exceeding 60°, a Single Assessment Numeric Evaluation score >90 points, a visual analog scale score of 0 points, and an American Shoulder and Elbow Score of 98 points. In conclusion, acellular dermal allografting can be used to reconstruct the anterior capsule in patients with massive irreparable subscapularis tears, similar to its use in superior capsular reconstruction in patients with massive posterosuperior rotator cuff tears.

• The Journal of Korean Academy of Prosthodontics
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• v.34 no.2
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• pp.385-402
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• 1996

The purpose of this study was to analyze how the stability of the implant prostheses and the loosening of the fastening screw was affected when the various types of Hex structure provided for the effect of anti-rotation of the single prostheses were given. Three dimensional finite element model was designed with which the implants with the external hex type of 0.75mm, 1.5mm and the implant with the internal hex type of 0.75mm, 1.5mm and the implant with the external hex type of $15^{\circ}$ tapered shape of 0.75mm were supposed to completely osseointegrate to the mandible. After fininshing the finite element model, the preload of 10N at the fastening screw was applied and then the vertical and $30^{\circ}$ lateral load of 200N was applied respectively at the cusp tips of the prostheses. The following results were obtained : 1. In case of displacement, the amount of displacement was increased at the internal hex type(model C, D) than at the external hex type(model A, B, E) when the vertical and lateral load was applied. 2. Less equivalent stress was represented at the model B with increased external hex height than at the model A when the vertical and lateral load was applied. 3. Much stress was represented at the model E with increased hex angle than at the model A in case of the stress happened to the implant body and the fastening screw when the vertical and lateral load was applied. 4. Much equivalent stress was represented at the model D with deepened internal hex height than at the model C when vertical and lateral load was applied. 5. The least stress was taken at the model B and the most stress was taken at the model D in case of the stress happened to the implant when the vertical and lateral load was applied. 6. The least stress was taken at the model C at the vertical load. And the least stress was taken at the model B at lateral load in case of the stress happened to the fastening screw. As a results of this study, the good lateral stability of prostheses and less stress of the component of implant was taken when the external hex height was increased, and the risk of neck fracture of implant and fastening screw was increased when the internal hex height was deepned because of long screw neck portion and thin implant neck portion.

• Clinics in Shoulder and Elbow
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• v.15 no.2
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• pp.86-90
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• 2012

Purpose: We studied the need for distal clavicle resection by comparing rotator cuff tear patients who underwent non-surgical treatment with and without acromioclavicular joint pathology. Materials and Methods: 45 cases that had been under follow up care for at least 9 months after receiving rotator cuff repair in our hospital between Jan. 2005 and Jun. 2011 had been studied. Acromioclavicular joint pathology group and control group were classified by physical examination and MRI findings. The temporal changes in shoulder joint abduction, internal and external rotation strength, ASES and KSS score of the two groups were measured and analyzed. Results: The acromioclavicular joint pathology complicated rotator cuff injury group's strength measurements for abduction, internal rotation, external rotation were each 8.05 (${\pm}4.54$), 11.33 (${\pm}6.05$), 10.24 (${\pm}5.27$) preoperatively and improved to 13.26 (${\pm}5.50$), 17.51 (${\pm}6.80$), 15.60 (${\pm}5.37$) post operatively while the KSS score and ASES score were each 49.07 (${\pm}15.28$) and 48.65 (${\pm}13.27$) preoperatively, improving to 84.48 (${\pm}10.96$) and 84.65. (${\pm}9.86$). The measurements for the group without complicating acromioclavicular pathology are as follows. The strength for abduction, internal rotation, external rotation was each 6.42 (${\pm}3.11$), 7.59 (${\pm}4.81$) and 7.93 (${\pm}4.49$) preoperatively, improving to 15.85 (${\pm}7.35$), 19.18 (${\pm}9.14$), 16.95 (${\pm}5.70$) post operatively, while the KSS score and ASES score each went from 42.12 (${\pm}6.43$) and 41.37 (${\pm}7.42$) to 83.44 (${\pm}6.30$) and 83.17 (${\pm}7.01$) respectively. The measurements for the two groups, however, did not show a statistically significant difference (p>0.05). Conclusion: Analysis of the rotator cuff injury groups with and without AC joint pathology showed that both groups had improved strength, ASES and KSS scores with no statistical difference difference among the groups. As such, it thought that conservative treatment is an acceptable alternative to distal clavicle resection.

• Journal of the Korean Arthroscopy Society
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• v.9 no.2
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• pp.162-166
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• 2005

Purpose: The purpose of this study were to evaluate the results of arthroscopic PCL reconstruction and posterolateral structure reconstruction. Materials and Methods: We performed 10 cases of arthrocopic PCL and posterolateral structure reconstruction using allo-achilles tendon. The average follow-up period was 25 months. We performed KT-2000 testing and posterior drawer test for posterior instability and tibial external rotation test for posterolateral rotatory instability, and measure Tegner and Lysholm score preoperatively and compared these with the results of a final evaluation in each cases. Results: The Preoperative average KT-2000 tests was 7.1 mm, posterior drawer test was Grade III and tibial external rotation test was positive at both 30 and 90 degrees of knee flexion in all cases. Preoperative average Lysholm score was 65.9 and Tegner score was 3.1. At the final evaluation, an average KT-2000 test was 2.2 mm, posteior drawer test, Grade 0 was 2 cases, Grade 1.4 cases, Grade II, 3 cases, Grade III, 1 cases. The tibial external rotation test at both 30 and 90 degrees of knee flexion was positive in 1 cases and positive at only 90 degrees in 2 cases. Lysholm score was 87.6 and Tegner score was 5.7. The objective and subjective score of final evaluation is increased in compare with preoperative one. Conclusion: Arthrocopic PCL and posterolateral structure reconstruction using allo-achilles tendon is one of the good surgical treatment method in patients having posterior and posterolateral rotatory instability.

• Clinics in Shoulder and Elbow
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• v.12 no.2
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• pp.189-198
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• 2009

Purpose: We wanted to evaluate the clinical results of the Latarjet procedure for treating anterior shoulder instability combined with a glenoid bone defect. Materials and Methods: Between Oct. 2006 and May. 2007, fourteen patients underwent a Latarjet operation to treat their anterior shoulder instability combined with a glenoid bone defect. The mean follow-up period was 15 months (range: 12 to 19 months), and the average age at the time of surgery was 29.9-years-old (range: 19 to 44 years). There were 13 males and 1 female. Eight patients exhibited involvement of the right shoulder. The dominant arm was involved in 8 patients. Six patients had undergone a previous arthroscopic Bankart repair before their Latarjet operation and 2 patients had a history of seizure. Results: The average Rowe score improved from 51.8 to 80.2 with 9 excellent, 4 good, and 1 fair results. The average Korean shoulder score for instability improved from 61.6 to 82.1 postoperatively. The active forward flexion and external rotation at the side of the involved shoulder was an average of $8^{\circ}$ and $16^{\circ}$ less than that of the uninvolved shoulder. The muscle strength of the involved shoulder measured 78.7% in forward flexion and 82.5% in external rotation, as compared with that of the uninvolved shoulder. There was 1 case of dislocation, 1 transient subluxation, 2 fibrotic unions, 1 resorption of the transferred coracoid process, 1 intraoperative broken bone, 1 transient musculocutaneous nerve injury and 1 case of stiffness. Conclusion: The Latarjet procedure for treating anterior shoulder instability combined with a significant glenoid defect effectively restores function and stability through extending the articular arc at the expense of external rotation. We should be cautious to avoid or detect complications when performing coracoid transfer.

• Journal of Acupuncture Research
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• v.31 no.2
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• pp.111-118
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• 2014

Objectives : Through an analysis of the previous studies, It is estimated that Chuna(shoulder traction) is effective in reducing the pain and increasing motion range of shoulder joint of the patient. So this study is to investigate the effects of Chuna(shoulder traction) on frozen shoulder. Methods : After treated with acupuncture and electro stimulating therapy, the subjects were measured list of measurement. And then treated with Chuna(shoulder traction) therapy, the subjects were measured list of measurement again. All treatment was performed by the same doctor who is a highly qualified about Chuna(shoulder traction). Chuna(shoulder traction) treatment takes 15 minutes. Three kind of Chuna(shoulder traction) therapy were performed for 5 minutes each. Depending on the degree of the subject's pain, treatment strength was adjusted. Results : - Chuna simultaneous treatment group, shoulder joint range of flexion, extension, abduction, adduction, external rotation and internal rotation movement improved statistically significant. - Chuna simultaneous and acupuncture treatment group, visual analogue scale(VAS) scores of two groups decreased statistically significant. Conclusions : The result suggests that Chuna(shoulder traction) can be effective to recover range of motion and reduce pain on patients with frozen shoulder.