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Ac dislocation

Hamidreza Aslani, Fateme Mirzaee, Zohreh Zafarani, Shahin Salehi
Acromioclavicular (AC) joint injuries are common and often seen in contact athletes, resulting from a fall on the shoulder tip with adducted arm. This joint is stabilized by both static and dynamic structures including the coracoclavicular (CC) ligament. Most reconstruction techniques focus on CC ligament augmentation as the primary stabilizer of the AC joint. The best surgical technique for some AC joint dislocations is still controversial. In this study, we explained a modification of the CC ligament reconstruction technique described by Wellmann...
January 2018: Archives of Bone and Joint Surgery
Yu Zhu, Peilin Hsueh, Bingfang Zeng, Yimin Chai, Changqing Zhang, Yunfeng Chen, Yuchen Wang, Tuerxun Maimaitiaili
BACKGROUND: Anatomic coracoclavicular (CC) ligament reconstruction (ACCR) provides good outcomes for Rockwood type III and VI acromioclavicular (AC) joint dislocations. Various grafts have been used, but complications from graft harvesting are not uncommon. This study examined the clinical and radiographic outcomes of patients with AC joint dislocations repaired with the autogenous anterior half of the peroneus longus tendon (AHPLT) to achieve ACCR. METHODS: Patients with a Rockwood type III to V AC joint dislocation and magnetic resonance imaging of the disruption of the CC ligaments, as well as the AC capsule, were prospectively recruited...
January 31, 2018: Journal of Shoulder and Elbow Surgery
Onur Kocadal, Korcan Yüksel, Melih Güven
PURPOSE: The two-tunnel coracoclavicular ligament reconstruction (CLR) technique is one of the treatment approaches commonly used in the surgical treatment of acromioclavicular (AC) injuries. Clavicular tunnel malposition is one of the major causes of failure in coracoclavicular ligament reconstruction. The main purpose of this study was to investigate the effects of clavicular tunnel placement on tendon loading in the CLR technique with finite element analysis. METHODS: Models of clavicle and scapula were constructed using computerized tomography images...
January 27, 2018: International Orthopaedics
Guolong Tang, Yu Zhang, Yuan Liu, Xiaodong Qin, Jun Hu, Xiang Li
BACKGROUND: There is no consensus on the effects of surgical versus conservative treatment on Rockwood type-III dislocation of the acromioclavicular joint in general orthopedic practice. The objective of this meta-analysis was to compare the clinical outcomes of patients managed surgically and conservatively following type-III acromioclavicular (AC) dislocation. METHODS: The Cochrane Library, EMBASE, MEDLINE via Ovid SP, and PubMed databases were searched for randomized controlled trials and observational studies...
January 2018: Medicine (Baltimore)
Ricardo Canquerini da Silva, Bruno Silveira Pavei, Márcio B Ferrari, George Sanchez, Luiza Barbosa Horta Barbosa, João L Ellera Gomes
Acromioclavicular (AC) joint instability is a fairly common and particularly limiting injury that may result in persistent pain and reduced quality of life. In most cases, conservative management is successful. However, in the case of a severe AC joint dislocation, surgical intervention may be warranted. Previous surgical techniques for treatment of AC joint instability include screw fixation between the coracoid and clavicle, coracoacromial ligament transfer from its acromial insertion to the clavicle, and reconstruction of the coracoacromial and/or coracoclavicular ligaments...
August 2017: Arthroscopy Techniques
Daniel B Haber, Robert C Spang, George Sanchez, Anthony Sanchez, Márcio B Ferrari, Matthew T Provencher
Injuries to the acromioclavicular (AC) joint are common, particularly in the young and active population. Approximately 9% of all shoulder girdle injuries involve the AC joint, and AC joint dislocations represent approximately 8% of all joint dislocations throughout the body. AC joint injuries are graded as type I through type VI according to the Rockwood classification. Type I and II injuries are typically treated nonoperatively, whereas type IV, V, and VI injuries are most often treated surgically. A variety of surgical techniques have been described, including anatomic and nonanatomic reconstruction...
December 2017: Arthroscopy Techniques
J Abel, M A Zumstein, L Bolliger, M O Schär
With 12% of all injuries concerning the shoulder, acromioclavicular (AC) joint dislocations are a common injury especially in young and active patients. The Rockwood classification is widely accepted, which differentiates between six types depending on the degree of injury and the vertical dislocation. Because the classification does not adequately address the horizontal instability, its benefits are questionable and there is currently no consensus. For this reason, the classification and the therapy of these injuries are increasingly becoming the subject of scientific investigations...
January 15, 2018: Der Orthopäde
Christiaan J A van Bergen, Annelies F van Bemmel, Tjarco D W Alta, Arthur van Noort
A direct force on the superior aspect of the shoulder may cause acromioclavicular (AC) dislocation or separation. Severe dislocations can lead to chronic impairment, especially in the athlete and high-demand manual laborer. The dislocation is classified according to Rockwood. Types I and II are treated nonoperatively, while types IV, V and VI are generally treated operatively. Controversy exists regarding the optimal treatment of type III dislocations in the high-demand patient. Recent evidence suggests that these should be treated nonoperatively initially...
December 18, 2017: World Journal of Orthopedics
X Shui, S Chen, G Huang, J Kong, C Zhou, W Lin
INTRODUCTION: To compare percutaneous minimally invasive repair (PMIR) of acute acromioclavicular (AC) joint dislocation under ultrasound guidance (PMIR-UN) vs. C-arm navigation (PMIR-CN). HYPOTHESIS: PMIR-UN has similar functional and radiographic outcomes as PMIR-CN. MATERIALS AND METHODS: We treated 48 patients with acute grade III or V AC joint dislocation with surgical reduction and fixation with Kirschner wires and cannulated screws...
December 21, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
Yonatan Calahorra, Michael Smith, Anuja Datta, Hadas Benisty, Sohini Kar-Narayan
There has been tremendous interest in piezoelectricity at the nanoscale, for example in nanowires and nanofibers where piezoelectric properties may be enhanced or controllably tuned, thus necessitating robust characterization techniques of piezoelectric response in nanomaterials. Piezo-response force microscopy (PFM) is a well-established scanning probe technique routinely used to image piezoelectric/ferroelectric domains in thin films, however, its applicability to nanoscale objects is limited due to the requirement for physical contact with an atomic force microscope (AFM) tip that may cause dislocation or damage, particularly to soft materials, during scanning...
December 14, 2017: Nanoscale
Jonathan D Ringenberg, Zachary Foughty, Adam D Hall, J Mack Aldridge, Joseph B Wilson, Marshall A Kuremsky
HYPOTHESIS AND BACKGROUND: The classification and treatment of acromioclavicular (AC) joint dislocations remain controversial. The purpose of this study was to determine the interobserver and intraobserver reliability of the Rockwood classification system. We hypothesized poor interobserver and intraobserver reliability, limiting the role of the Rockwood classification system in determining severity of AC joint dislocations and accurately guiding treatment decisions. METHODS: We identified 200 patients with AC joint injuries using the International Classification of Diseases, Ninth Revision code 831...
March 2018: Journal of Shoulder and Elbow Surgery
Kuang-Wu Lee, Thorsten Pöschel
We consider electroconvection as a response of nematic liquid crystals to an external electric AC field, in the absence of free charge carriers. Previous experimental and theoretical results emphasized charge carriers as a necessary precondition of electroconvection because free-charges in the fluid can respond to an external electric field. Therefore, ionized molecules are considered as responsible for the driving of electroconvective flows. In experiments, finite conductivity is achieved by adding charge-carrying dye molecules or in non-dyed liquid crystals by impurities of the samples...
November 29, 2017: Soft Matter
Engin Cetinkaya, Yavuz Arıkan, Kubilay Beng, Harun Mutlu, Merter Yalçınkaya, Onat Üzümcügil
OBJECTIVE: The aim of this study was to compare the long-term clinical and radiological results of Acromioclavicular (AC) fixation with K-wires (the modified Phemister procedure) and Coracoclavicular (CC) fixation with the Bosworth screw in the surgical treatment of Type 3 AC joint dislocations. METHODS: Thirty-two patients with complete set of medical records and who received surgical treatment between September 2005 and January 2009 due to acute Rockwood Type 3 AC joint dislocation and properly attended their follow-ups were retrospectively evaluated...
December 2017: Acta Orthopaedica et Traumatologica Turcica
Felix Dyrna, Celso Cruz Timm de Oliveira, Michael Nowak, Andreas Voss, Elifho Obopilwe, Sepp Braun, Leo Pauzenberger, Andreas B Imhoff, Augustus D Mazzocca, Knut Beitzel
PURPOSE: Current techniques for anatomic repair of the dislocated acromioclavicular (AC) joint aim on reconstruction of the AC ligaments and utilize tunnels drilled through the acromion . This improves the stability of the reconstruction but might also increase the risk of fractures at the acromion. The purpose of this study was to evaluate the fracture risk for the acromion after transacromial tunnel placement for anatomic AC joint stabilization procedure. It was hypothesized that the risk of fracture of the acromion is correlated to size and orientation of bone tunnels commonly used for anatomic AC joint reconstruction...
October 6, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Liang Zhao, Hua Yan, Changsheng Yang, Daozhang Cai, Yijun Wang
BACKGROUND: Arthroscopic reduction has become increasingly popular as an alternative to open reduction for the treatment of developmental dysplasia of the hip (DDH). However, patient outcomes beyond one and a half years after surgery remain unclear. The purpose of this study is to report the medium-term outcomes of walking-age patients who received arthroscopic reduction after an unsuccessful closed reduction. This research was conducted as part of a retrospectively registered study. METHODS: We performed arthroscopic reduction in eight children with DDH after failed closed reduction between January 2010 and January 2012 and followed all cases for a minimum of 5 years...
September 21, 2017: Journal of Orthopaedic Surgery and Research
Ding Xu, Peng Luo, Jukun Chen, Liefeng Ji, Luxu Yin, WeiKang Wang, Jiang Zhu
PURPOSE: Hook plate fixation is widely used to treat acromioclavicular joint dislocation. However, there are many post-operative complications affecting the effect of treatment. The aim of this study is to evaluate the efficacy of the clavicular hook plate with different hook angles as a method of treatment in AC joint dislocation, and to guide the clinical application of hook plate. METHODS: We prospectively analysed 54 patients who were diagnosed with AC joint dislocation and treated with hook plate fixation by different hook angles...
December 2017: International Orthopaedics
Jeffrey M Mah
OBJECTIVE: To assess the general health status of patients after nonoperative (Non-op) versus operative (OP) treatment for acromioclavicular (AC) joint dislocations. DESIGN: Multicenter randomized controlled clinical trial conducted in 11 Canadian trauma centers. A total of 83 patients with acute (≤28 days old), complete (Rockwood grades III, IV, or V) dislocations of the AC joint were included in this study. INTERVENTION: Participants were randomized to Non-op treatment or OP treatment with hook plate fixation...
September 2017: Journal of Orthopaedic Trauma
Yong-Beom Lee, Jeehyoung Kim, Ho-Won Lee, Byung-Su Kim, Won-Yong Yoon, Yon-Sik Yoo
BACKGROUND: Among coracoclavicular (CC) fixation techniques, the use of flip button device was demonstrated to have successful outcomes with the advantage of being able to accommodate an arthroscopic procedure. PURPOSE: This study was conducted to investigate the factors associated with loss of fixation after arthroscopically assisted CC fixation using a single flip button device for acromioclavicular (AC) joint dislocations. MATERIALS AND METHODS: We enrolled a total of 47 patients (35 men and 12 women)...
2017: BioMed Research International
Ioannis K Triantafyllopoulos, Kalliopi Lampropoulou-Adamidou, Nikitas P Schizas, Eleftherios V Karadimas
BACKGROUND: Most acromioclavicular (AC) joint injuries occur in men in their third decade of life during high-speed or high-impact body contact sports. The management of acute complete AC joint dislocation is surgical. Current surgical techniques include anatomic reconstruction of the main restraints of the AC joint and aim to improve functional outcomes and to reduce the complication rate. METHODS: We present 10 cases of acute type V AC joint dislocation in professional athletes treated surgically with anatomic reconstruction of the coracoclavicular and AC ligaments and augmentation with the use of a synthetic polyester tape...
December 2017: Journal of Shoulder and Elbow Surgery
Carmen Hann, Natascha Kraus, Marvin Minkus, Nina Maziak, Markus Scheibel
PURPOSE AND HYPOTHESIS: Due to high rate of persisting dynamic posterior translation (DPT) following isolated coracoclavicular double-button technique for reconstruction of the acromioclavicular (AC) joint reported in the literature, an additional acromioclavicular cerclage was added to the procedure. The aim of this study was to evaluate the clinical and radiological results of patients with high-grade AC-joint instability treated with a double TightRope technique with an additional percutaneous acromioclavicular cerclage...
July 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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