• Journal of Korean Foot and Ankle Society
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• v.15 no.1
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• pp.36-38
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• 2011

Ankle fracture and Achilles tendon rupture are common as an isolated injury. However, Achilles tendon rupture with ipsilateral ankle fracture is uncommon, and occurs by a different injury mechanism with a risk of negligence. We report a case of Achilles tendon rupture with ipsilateral medial malleolar fracture.

• Journal of the Korean Arthroscopy Society
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• v.12 no.1
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• pp.7-11
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• 2008

Purpose: The purpose of this study was to compare the clinical outcomes of ACL reconstruction using autogenous hamstring tendon and allo-tibialis tendon. Materials and Methods: Between March 2002 and March 2005, We performed 30 ACL reconstuructions using hamstring autograft and 20 ACL reconstuructions using tibialis tendon allograft. The average follow up period was 22 months in auto-hamstring tendon and 18 months in allo-tibialis tendon. For the clinical evaluation, we measured the Lysholm score, International Knee Documentation Committee(IKDC) score and anterior laxity by KT-2000 arthrometer at final follow up and compare the results between two groups. Results: The Lysholm score improved from 69.5 preoperatively, to 95.3 at final follow-up in the hamstring autograft groups and from 69.0 to 90.4 in the tibialis allograft groups. According to the IKDC evaluation form, 80% of autogenous hamstring tendon group and 73% of allograft group were good results, higher than B(almost normal)(p>0.05). The average KT-2000 arthrometer side-to-side difference, decreased from 7.1mm preoperatively, to 1.8mm at final follow-up in the hamstring autograft groups and from 7.4 mm to 2.4mm in the tibialis allograft groups. Conclusion: The clinical results of ACL reconstruction using auto-hamstring tendon and allo-tibialis tendon showed no significant differences. The allo-tibialis tendon is an acceptable substitute for auto-hamstring tendon in ACL reconstruction.

• Journal of the Korean Arthroscopy Society
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• v.11 no.2
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• pp.85-91
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• 2007

Purpose: To analyze the clinical results and second look arthroscopic findings of anterior cruciate ligament(ACL) reconstruction with a tibialis anterior tendon allograft and a hamstring tendon autograft. Materials and Methods: We reviewed the cases of athroscopic ACL reconstructions using allogenous tibialis anterior(TA) tendon and autogenous hamstring tendon done from March, 2002 to August, 2005 and followed-up more than 1 year. The 250 cases were included in this study and allogenous TA tendon was used in 150 cases and autogenous hamstring tendon in 100 cases. The mean follow-up period was 15 months and 14 months, respectively. The clinical evaluation was done by Lachman test, Pivot shift test, KT-1000 arthrometer and International Knee Documentation Committee(IKDC) knee score. Graft tension, synovial coverage were observed in cases of second look arthroscopy. Results: At final follow-up, there was no significance between the two groups in clinical examination. On second look arthroscopy, synovial coverage was better in autogenous hamstring tendon group than allogenous TA tendon group(p=0.005). But no difference was found in graft tension(p>0.05). Conclusion: There were no significant differences between the two groups in the clinical results. But autogenous hamstring tendon group had better synovial coverage than allogenous TA tendon group in second look arthroscopy.

• Journal of Korean Foot and Ankle Society
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• v.23 no.3
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• pp.100-104
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• 2019

Purpose: This study examined the clinical outcomes and assessed the average time to return to play following a peroneal tendon repair in Korean athletes. Materials and Methods: Between March 2004 and February 2017, a total of 30 athletes underwent peroneal tendon repair for a peroneal tendon tear. The indications of surgical treatment were chronic pain or intractable symptoms after a previous ankle sprain affecting sports activity refractory to conservative treatment for at least six months. The patient underwent tubulization for a longitudinal tendon rupture. Peroneus longus to peroneus brevis tenodesis was performed when tendon repair was impossible due to total rupture or multiple longitudinal rupture. Results: Twenty patients not included in this study were as follows: insufficient follow-up, previous surgery, and additional bone surgery. All 10 patients had a previous ankle sprain history, tenderness and swelling on the retromalleolar area. In the 10 patient population, there were five peroneus brevis tendon tears, three peroneus longus tendon tears, one peroneus longus and brevis tendon tear, and one peroneus brevis and superior peroneal retinaculum tear. In the 10 patients, six cases of peroneal brevis tendon repair and four cases of peroneal longus to brevis tenodesis were performed. The preoperative American Orthopaedic Foot and Ankle Society score was improved from a mean of 60.6 (standard deviation [SD], 8.64) to a mean of 90.2, postoperatively (SD, 4.4; p<0.012). The preoperative visual analogue scale was improved from a mean of 5.43 (SD, 1.2) to 0.5 (SD, 0.16), postoperatively (p<0.023). The mean length of time to return to play was 12.2 weeks (range, 8~16 weeks). Conclusion: Peroneal tendon tear can occur due to sports injuries. If there is tenderness at the retromalleolar area, the surgeon should consider a peroneal tendon lesion. Surgical repair of the peroneal tendon can be an effective treatment to help athletes to return to play.

• The Journal of Korea Robotics Society
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• v.15 no.2
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• pp.190-196
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• 2020

Mechanical systems using tendon-driven actuators have been widely used for bionic robot arms because not only the tendon based actuating system enables the design of robot arm to be very efficient, but also the system is very similar to the mechanism of the human body's operation. The tendon-driven actuator, however, has a drawback caused by the friction force of the sheath. Controlling the system without considering the friction force between the sheath and the tendon could result in a failure to achieve the desired dynamic behaviors. In this study, a mathematical model was introduced to determine the friction force that is changed according to the geometrical pathway of the tendon-sheath, and the model parameters for the friction model were estimated by analyzing the data obtained from dedicated tests designed for evaluating the friction forces. Based on the results, it is possible to appropriately predict the friction force by using the information on the pathway of the tendon.

• Journal of the Korea institute for structural maintenance and inspection
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• v.11 no.6
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• pp.181-192
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• 2007

In domestic case, there are no results of corresponding researches for measuring external tendon force. The purpose of the present paper is therefore to measure external tendon force by using deriving ultrasonic method. For this purpose, we designed and manufactured wedges and test system, and measured ultrasonic pulse velocity and pulse amplitude. By using measured data, we tried to analyze the characteristics of tendon force, and to derive the relationship between tendon force and ultrasonic pulse velocity, finally to develop the technic of measuring system using ultrasonic pulse velocity. So tendon force-velocity relationship was proposed by equations, and those equations of which errors were 3.92~8.77% will be possible to adapt in-site.

• Journal of Korean Foot and Ankle Society
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• v.21 no.2
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• pp.70-74
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• 2017

Fractures and fracture-dislocations of the ankle are caused by a variety of mechanisms. In addition to fractures, injuries of soft tissue, such as ligaments, tendons, nerves, and muscles may also occur. Among these, a tibialis posterior tendon injury is difficult to be identified due to swelling and pain at the fracture site. It is difficult to observe tibialis posterior tendon injury on a simple radiograph; it is usually found during surgery by accident. There are some studies regarding irreducible ankle fracture-dislocations due to interposition of the tibialis posterior tendon; however, to the best of our knowledge, there has not been any report about interposition of injured tibialis posterior tendon. Herein, we report a case of an irreducible fracture-dislocation of the ankle due to injured tibialis posterior tendon interposition that was observed intraoperatively, interrupting the reduction of ankle fracture-dislocation. We obtained satisfactory clinical result after reduction of the trapped tendon, fracture reduction, and internal fixation; therefore, we are willing to report this case with the consent of the patient. This study was conducted with an approval from the local Institutional Ethics Review Board.

• International Journal of Naval Architecture and Ocean Engineering
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• v.1 no.1
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• pp.13-19
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• 2009

The primary objective of this paper is to investigate the dynamic stability and survivability of a four-column classic TLP (tension-leg platform) under less-than-extreme storm conditions where one or more tendons have been lost due to damage or disconnect. The transient responses of the platform and tendon tensions at the moment of disconnection are particularly underscored. The numerical simulation is based on the BE-FE hybrid hull-tendon-riser coupled dynamic analysis in time domain. Compared to the common industry practice of checking the system without a failed tendon in the beginning, the maximum tension on the neighboring tendon can be significantly increased at the moment of disconnection due to the snap-like transient effects, which can lead to unexpected failure of the total system. It is also found that the transient effects can be reduced with the presence of TTRs (top-tensioned risers) with pneumatic tensioners. It is also seen that the TLP cannot survive in the 100-yr hurricane condition after losing one tendon.

• PNF and Movement
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• v.18 no.3
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• pp.425-433
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• 2020

Purpose: The purpose of this study was to investigate the effect of 7Hz vibration on the thickness of the rectus femoris, medial femur, rectus femoris tendon, and Achilles tendon. Methods: The statistical methods before and after working around the average value of each of the legs included repeated measures ANOVA. The subjects were 26 males residing in the N area, and we measured the change in muscle thickness and tendon thickness before, four weeks, and eight weeks after the experiment in two groups of 13 subjects each. The analysis method was a two-way repeated measurement variance analysis (ANOVA) with a significance level of 0.05 Results: The rectus femoris, medial broad muscle, rectus femur, and Achilles tendon showed significant increases in the interaction between the periods as well as between the periods and groups (p < 0.05). Conclusion: As a result of this study, the 7Hz vibration had a positive effect on the thickness of the rectus femoris and the vastus medialis muscle as well as the thickness of the rectus femoris tendon and Achilles tendon. It is expected to be used as basic data for vibrational exercises in the future studies and is expected to be used as an exercise to strengthen the leg muscles and tendons.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.41 no.6
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• pp.617-625
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• 2021

The problems associated with the continuous method of a domestically improved prestressed concrete (PSC) girder and the bending moment of a continuous tendon were studied. Based on the results, a continuous tendon model was proposed that can resist the negative bending moment of an intergirder. This model lowers the anchorage of the continuous tendon as far as possible under the girder, and extends the tendon section arranged under the girder. This method reduces the PS's bending moment in the middle of the span, but maximizes it in the intergirder. This continuous tendon model can offer a suitable method for continuity before manufacturing a composite, which requires a higher design bending moment in the intergirder than in the middle of the span.