• Title/Summary/Keyword: bone screw fixation

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Rigid Fixation using Bioabsorbable Mesh and Screws in Facial Bone Fracture (흡수성 망상판과 나사를 이용한 안면골절의 견고정법)

  • Shin, Dong-Hyeok;Kim, Deok-Jung;Kim, Soo-Young;Hwang, Eun-A;Choi, Hyun-Gon;Kim, Soon-Heum;Uhm, Ki-Il
    • Archives of Plastic Surgery
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    • v.37 no.5
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    • pp.717-720
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    • 2010
  • Purpose: Absorbable plate and screw fixation is widely used technique for internal rigid fixation in craniomaxillofacial surgery. However, there are some potential problems associated with the use of plate. The purpose of this study is to evaluate the feasibility of bone fixation in facial fracture using absorbable mesh in place of absorbable plate. Methods: The records of 55 patients with zygomaticomaxilla fractures treated by open reduction, performed by the author from February 2008 to May 2009, were retrospectively reviewed. Patients were selected to receive absorbable mesh fixation. The incidence of all complications including infection, hypoesthesia, and deformity was examined. Analysis with postoperative computed tomography follow-up demonstrates degree of reduction. Results: Forty-six patients met criteria for inclusion in the study. All patients went on to satisfactory healing without complication. Postoperative computed tomography revealed good bony alignment similarly non affected side. Conclusion: This study demonstrates that the rigid internal fixation of fractured bone fragments using absorbable mesh is more effective than absorbable plate, especially in comminuted fracture of maxilla.

Reduction of Zygomatic Fractures Using the Carroll-Girard T-bar Screw

  • Baek, Ji Eun;Chung, Chan Min;Hong, In Pyo
    • Archives of Plastic Surgery
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    • v.39 no.5
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    • pp.556-560
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    • 2012
  • Zygomatic fractures are the second most common facial bone fractures encountered and treated by plastic surgeons. Stable fixation of fractured fragments after adequate exposure is critical for ensuring three-dimensional anatomic reduction. Between January 2008 and December 2010, 17 patients with zygomatic fractures were admitted to our hospital; there were 15 male and 2 female patients. The average age of the patients was 41 years (range, 19 to 75 years). We exposed the inferior orbital rim and zygomatic complex through a lateral brow, intraoral, and subciliary incisions, which allowed for visualization of the bone, and then the fractured parts were corrected using the Carroll-Girard T-bar screw. Postoperative complications such as malar asymmetry, diplopia, enophthalmos, and postoperative infection were not observed. Lower eyelid retraction and temporary ectropion occurred in 1 of the 17 patients. Functional and cosmetic results were excellent in nearly all of the cases. In this report, we describe using the Carroll-Girard T-bar screw for the reduction of zygomatic fractures. Because this instrument is easy to use and can rotate to any direction and vector, it can be used to correct displaced zygomatic bone more accurately and safely than other devices, without leaving facial scars.

Three-dimensional finite element analysis of the stress distribution and displacement in different fixation methods of bilateral sagittal split ramus osteotomy

  • Yun, Kyoung In;Cho, Young-Gyu;Lee, Jong-Min;Park, Yoon-Hee;Park, Myung-Kyun;Park, Je Uk
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.38 no.5
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    • pp.271-275
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    • 2012
  • Objectives: This study evaluated a range of fixation methods to determine which is best for the postoperative stabilization of a mandibular osteotomy using three-dimensional finite element analysis of the stress distribution on the plate, screw and surrounding bone and displacement of the lower incisors. Materials and Methods: The model was generated using the synthetic skull scan data, and the surface model was changed to a solid model using software. Bilateral sagittal split ramus osteotomy was performed using the program, and 8 different types of fixation methods were evaluated. A vertical load of 10 N was applied to the occlusal surface of the first molar. Results: In the case of bicortical screws, von-Mises stress on the screws and screw hole and deflection of the lower central incisor were minimal in type 2 (inverted L pattern with 3 bicortical repositioning screws). In the case of plates, von-Mises stress was minimal in type 8 (fixation 5 mm above the inferior border of the mandible with 1 metal plate and 4 monocortical screws), and deflection of the lower central incisor was minimal in types 6 (fixation 5 mm below the superior border of the mandible with 1 metal plate and 4 monocortical screws) and 7 (fixation 12 mm below the superior border of the mandible with 1 metal plate and 4 monocortical screws). Conclusion: Types 2 and 6 fixation methods provide better stability than the others.

Two-Year Follow-up Results of Anteroposterior Cannulated Screw Fixation of Posterior Malleolar Fragment in the Trimalleolar Fracture (족관절 삼과 골절에서 전후방 유관나사 후과 고정술의 2년 추시 결과)

  • Jung, Sung Yoon;Lee, Myoung Jin;Jung, Young Hun
    • Journal of Korean Foot and Ankle Society
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    • v.20 no.2
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    • pp.67-72
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    • 2016
  • Purpose: The purpose of this study was to assess the 2-year follow-up results of patients with a trimalleolar fracture, who had undergone an anterior incision cannulated screw fixation of the posterior malleolar fragment, which had more than 25% of articular involvement or had no cortical continuity with the distal tibia. Materials and Methods: Among 28 patients with a trimalleolar fracture who had undergone fixation of the posterior malleolar fragment between February 2005 and February 2010, 14 patients, who underwent an anterior incision cannulated screw fixation of posterior malleolar fragment and were followed-up for more than 2 years, were selected. The postoperative clinical and radiological findings immediately and at the 1- and 2-year follow-up were compared. The clinical findings were evaluated as American Orthopaedic Foot and Ankle Society (AOFAS) score. The radiological assessment was evaluated as the maintenance of reduction, period to bone union, and the presence of nonunion, malunion, and complications. Results: The clinical outcome by mean AOFAS score revealed 83.0 points in the group with preoperative displacement below 2 mm and 80.7 points in the group with preoperative displacement above 2 mm postoperatively. The mean AOFAS score was 91.7 and 93.1 points in the group with preoperative displacement below 2 mm on 1- and 2-year follow-up, respectively, and 89.8 and 91.7 points in group with the preoperative displacement above 2 mm on 1- and 2-year follow-up, respectively. After a 2-year follow-up among 14 cases selected for this study, 13 cases showed an excellent reduction state and only 1 case (7.1%) showed a displacement of more than 2 mm. No complication were encountered in the group with preoperative displacement below 2 mm. On the other hand, among 8 patients in the group with preoperative displacement above 2 mm, there were 3 with limitations of the range of motion of the ankle joint (37.5%) and 1 post-traumatic arthritis (12.5%) at the 2-year follow-up. Conclusion: Anterior incision cannulated screw fixation of the posterior malleolar fragment could be a valuable method for the treatment of trimalleolar fractures that provides satisfactory results.

Simplified FE Analysis for the Design of Pedicle Screw System (척추경 나사못 시스템의 설계를 위한 단순 유한요소해석)

  • 정일섭;안면환
    • Journal of Biomedical Engineering Research
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    • v.21 no.6
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    • pp.559-566
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    • 2000
  • Methodology for finite element analysis of vertebral column and pedicle screw system, which circumvents the tremendous difficulties in geometric, material, and structural modeling, is proposed. The simplification is focused on the modeling of the cancellous bone in vertebral body the intervertebral disc. and the instrumented internal fixation devices. Each proposed modeling technique is justified to result in reasonable accuracy. These methods are believed to be suitable for the development of pedicle screw systems, not only because modeling itself is much simpler. but also because reliable empirical data for disc stiffness may be incorporated with little additional effort, and presumably frequent design change may be easily reflected on the analysis.

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Posterior Cervical Fixation with a Nitinol Shape Memory Loop for Primary Surgical Stabilization of Atlantoaxial Instability : A Preliminary Report

  • Kim, Duk-Gyu;Eun, Jong-Pil;Park, Jung-Soo
    • Journal of Korean Neurosurgical Society
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    • v.52 no.1
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    • pp.21-26
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    • 2012
  • Objective : To evaluate a new posterior atlantoaxial fixation technique using a nitinol shape memory loop as a simple method that avoids the risk of vertebral artery or nerve injury. Methods : We retrospectively evaluated 14 patients with atlantoaxial instability who had undergone posterior C1-2 fusion using a nitinol shape memory loop. The success of fusion was determined clinically and radiologically. We reviewed patients' neurologic outcomes, neck disability index (NDI), solid bone fusion on cervical spine films, changes in posterior atlantodental interval (PADI), and surgical complications. Results : Solid bone fusion was documented radiologically in all cases, and PADI increased after surgery (p<0.05). All patients remained neurologically intact and showed improvement in NDI score (p<0.05). There were no surgical complications such as neural tissue or vertebral artery injury or instrument failure in the follow-up period. Conclusion : Posterior C1-2 fixation with a nitinol shape memory loop is a simple, less technically demanding method compared to the conventional technique and may avoid the instrument-related complications of posterior C1-2 screw and rod fixation. We introduce this technique as one of the treatment options for atlantoaxial instability.

THE CLINICAL STUDY OF FACIAL BONE FRACTURE

  • Lee, Dong-Keun;Yim, Chang-Joon;Yang, Hee-Chang
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.11 no.1
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    • pp.12-20
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    • 1989
  • This is a retrospective study on 452 patients with maxillofacial bone fracture. The patients were treated at the Dept. of Oral and Maxillofacial Surgery, WON KWANG UNIV. HOSPITAL from Aug. 1, 1984 to Sept. 30, 1988. The results were as follows. 1. The facial bone fractures occured most frequently in the twenties (35.3%)and male were predominant(75%) than female. 2. The most frequent etiologic factor was traffic accident. 3. The most common location of facial bone fracture was mandible(57%). Zygomatic bone & arch(39.9%) were most common on middle 1/3 of the face and symphysis(37.1%) were most common on the mandible. 4. The time from injury to treatment was variable from under the 1 week (65%) to over the 1 week(35%). In most case of the patients were treated beyond the 3 days(51.5%). 5. The relationship of intermaxillary fixation period and treatment method was an intimate relationship. The IMF period was reduced by the use of plate and screw osteosynthesis. 6. The weight loss was proportioned to intermaxillary fixation period.

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Comparision between Syndesmotic Screw Fixation and Knotless Tightrope® Fixation on Ankle Fractures with Distal Tibiofibular Syndesmosis Injury (원위 경비 인대 결합 손상을 동반한 족관절 골절에서 Knotless Tightrope®를 이용한 고정법과 인대 결합 나사 고정법의 임상적 수술적 결과 비교)

  • Park, Jun-Sik;Lee, Sung-Jin;Kang, Sae-Hyun;Kim, Gab-Lae
    • Journal of Korean Foot and Ankle Society
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    • v.22 no.4
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    • pp.161-165
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    • 2018
  • Purpose: A distal tibiofibular syndesmosis injury with an ankle fracture is usually fixed with syndesmotic screws. Knotless Tightrope$^{(R)}$ has been used as an alternative procedure because of the fewer reported complications. Therefore, this study compared the two surgeries. Materials and Methods: Forty-two patients, who underwent syndesmotic screw fixation, and 34 patients, who underwent Knotless Tightrope$^{(R)}$ fixation for distal tibiofibular syndesmosis injury from February 2014 to February 2016, were analyzed retrospectively. The visual analogue scale (VAS) score, American Orthopaedic Foot and Ankle Society (AOFAS) score, range of motion of ankle at 1 year after surgery, tibiofibular clear space, and tibiofibular interval at preoperative, postoperative and 1 year after surgery were investigated. Results: The VAS score, AOFAS score and radiographs were similar in the two groups. Knotless Tightrope$^{(R)}$ showed better results in complications and plantarflexion. Conclusion: Knotless Tightrope$^{(R)}$ fixation is a useful treatment that does not show a difference in fixation strength and clinical outcome. Knotless Tightrope$^{(R)}$ fixation also has an advantage in the range of motion and complications.

The Management of Bilateral Interfacetal Dislocation with Anterior Fixation in Cervical Spine : Comparison with Combined Antero-Posterior Fixation

  • Kim, Ki-Hong;Cho, Dae-Chul;Sung, Joo-Kyung
    • Journal of Korean Neurosurgical Society
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    • v.42 no.4
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    • pp.305-310
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    • 2007
  • Objective : Combined antero-posterior fixation has been a standard method for bilateral interfacetal dislocation in cervical spine. The purpose of this study is to evaluate the efficacy and complication of anterior cervical stabilization in treatment of bilateral interfacetal dislocation. Methods : A total of 65 cases of traumatic bilateral interfacetal dislocation in cervical spine who were managed in our institution, from Mar. 1997 to Feb. 2006, were included in this study. Closed reduction was tried in all cases before operation. If closed reduction was accomplished successfully, only anterior cervical fixation was performed (Group I), and attempted to place screws bicortically as possible with unicortical screws. If failed, posterior open reduction with fixation was first tried, followed by anterior cervical fixation (Group II). All patients were evaluated for neurological outcome and radiological evidence of healing. Results : The Group I included 47 patients and the Group II, 18 patients. The improvement of Frankel grade and increase of mean cervical lordosis angles were not statistically different between two groups. Screw-plate system used did not influence the outcome. On follow up, solid bone fusion was evident and there were no cases of instability in both groups. Conclusion : Our study demonstrated that anterior cervical fixation on BID is safe and effective in comparison with combined antero-posterior cervical fixation.

Unilateral C1 Lateral Mass and C2 Pedicle Screw Fixation for Atlantoaxial Instability in Rheumatoid Arthritis Patients : Comparison with the Bilateral Method

  • Paik, Seung-Chull;Chun, Hyoung-Joon;Bak, Koang Hum;Ryu, Jeil;Choi, Kyu-Sun
    • Journal of Korean Neurosurgical Society
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    • v.57 no.6
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    • pp.460-464
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    • 2015
  • Objective : Bilateral C1 lateral mass and C2 pedicle screw fixation (C1LM-C2P) is an ideal technique for correcting atlantoaxial instability (AAI). However, the inevitable situation of vertebral artery injury or unfavorable bone structure may necessitate the use of unilateral C1LM-C2P. This study compares the fusion rates of the C1 lateral mass and C2 pedicle screw in the unilateral and bilateral methods. Methods : Over five years, C1LM-C2P was performed in 25 patients with AAI in our institute. Preoperative studies including cervical X-ray, three-dimensional computed tomography (CT), CT angiogram, and magnetic resonance imaging were performed. To evaluate bony fusion, measurements of the atlanto-dental interval (ADI) and CT scans were performed in the preoperative period, immediate postoperative period, and postoperatively at 1, 3, 6, and 12 months. Results : Unilateral C1LM-C2P was performed in 11 patients (44%). The need to perform unilateral C1LM-C2P was due to anomalous course of the vertebral artery in eight patients (73%) and severe degenerative arthritis in three patients (27%). The mean ADI in the bilateral group was 2.09 mm in the immediate postoperative period and 1.75 mm in 12-months postoperatively. The mean ADI in the unilateral group was 1.82 mm in the immediate postoperative period and 1.91 mm in 12-months postoperatively. Comparison of ADI measurements showed no significant differences in either group (p=0.893), and the fusion rate was 100% in both groups. Conclusion : Although bilateral C1LM-C2P is effective for AAI from a biomechanical perspective, unilateral screw fixation is a useful alternative in patients with anatomical variations.