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https://www.readbyqxmd.com/read/28458187/torsional-stiffness-after-subtalar-arthrodesis-using-second-generation-headless-compression-screws-biomechanical-comparison-of-2-screw-and-3-screw-fixation
#1
Markus Riedl, Richard R Glisson, Takumi Matsumoto, Stefan G Hofstaetter, Mark E Easley
BACKGROUND: Subtalar joint arthrodesis is a common operative treatment for symptomatic subtalar arthrosis. Because excessive relative motion between the talus and calcaneus can delay or prohibit fusion, fixation should be optimized, particularly in patients at risk for subtalar arthrodesis nonunion. Tapered, fully-threaded, variable pitch screws are gaining popularity for this application, but the mechanical properties of joints fixed with these screws have not been characterized completely...
June 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28382830/effect-of-interfragmentary-gap-on-compression-force-in-a-headless-compression-screw-used-for-scaphoid-fixation
#2
E S Tan, I S Mat Jais, S Abdul Rahim, S C Tay
We investigated the effect of an interfragmentary gap on the final compression force using the Acutrak 2 Mini headless compression screw (length 26 mm) (Acumed, Hillsboro, OR, USA). Two blocks of solid rigid polyurethane foam in a custom jig were separated by spacers of varying thickness (1.0, 1.5, 2.0 and 2.5 mm) to simulate an interfragmentary gap. The spacers were removed before full insertion of the screw and the compression force was measured when the screw was buried 2 mm below the surface of the upper block...
April 1, 2017: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/28260129/validity-of-computed-tomography-in-predicting-scaphoid-screw-prominence-a-cadaveric-study
#3
Clare E Griffis, Cara Olsen, Leon Nesti, C Frank Gould, Michael Frew, Patricia McKay
BACKGROUND: Studies of hardware protrusion into joint spaces following fracture fixation have been performed to address whether or not there is discrepancy between the actual and radiographic appearance of screw prominence. The purpose of our study was to prove that, with respect to the scaphoid, prominence as visualized on CT scan is real and not a result of metal artifact. METHODS: Forty-two cadaveric wrists were separated into four allotted groups with 21 control specimens and 21 study specimens...
April 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28114949/individual-headless-compression-screws-fixed-with-three-dimensional-image-processing-technology-improves-fusion-rates-of-isolated-talonavicular-arthrodesis
#4
Mei-Ming Xie, Kang Xia, Hong-Xin Zhang, Hong-Hui Cao, Zhi-Jin Yang, Hai-Feng Cui, Shang Gao, Kang-Lai Tang
BACKGROUND: Screw fixation is a typical technique for isolated talonavicular arthrodesis (TNA), however, no consensus has been reached on how to select most suitable inserted position and direction. The study aimed to present a new fixation technique and to evaluate the clinical outcome of individual headless compression screws (HCSs) applied with three-dimensional (3D) image processing technology to isolated TNA. METHODS: From 2007 to 2014, 69 patients underwent isolated TNA by using double Acutrak HCSs...
January 23, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27595474/fixation-strength-of-four-headless-compression-screws
#5
Adam Hart, Edward J Harvey, Reza Rabiei, Francois Barthelat, Paul A Martineau
To promote a quicker return to function, an increasing number of patients are treated with headless screws for acute displaced and even non-displaced scaphoid fractures. Therefore, it is imperative to understand and optimize the biomechanical characteristics of different implants to support the demands of early mobilization. The objective of this study was to evaluate the biomechanical fixation strength of 4 headless compression screws under distracting and bending forces. The Acutrak Standard, Acutrak Mini, Synthes 3...
October 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27390567/biomechanical-analysis-of-internal-fixation-methods-for-distal-interphalangeal-joint-arthrodesis
#6
Stephanie K Rigot, Rafael Diaz-Garcia, Richard E Debski, John Fowler
BACKGROUND: The biomechanical performance of distal interphalangeal joint (DIPJ) fixation techniques in response to cyclic and load-to-failure bending loads is generally unknown. The purpose of this study is to assess the performance of 4 commonly used techniques for DIP arthrodesis. METHODS: Phalanges were fixed by one of the following techniques: (1) 2 parallel Kirschner wires (K-wires), (2) 1 longitudinal K-wire and 1 oblique K-wire, (3) an Acutrak® 2 Micro headless compression screw, or (4) 90-90 wiring...
June 2016: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/27341556/larger-screw-diameter-may-not-guarantee-greater-pullout-strength-for-headless-screws-a-biomechanical-study
#7
Chen-Chiang Lin, Kun-Jhih Lin, Wen-Chuan Chen, Hung-Wen Wei, Kang-Ping Lin, Cheng-Lun Tsai
Headless compression screws (HCSs) are commonly utilized devices for small bone fracture fixation. The Mini-Acutrak 2 and headless reduction (HLR) screws are the newer version types, in which both have fully threaded and variable pitch design. Specifically, the HLR is characterized by two thread runouts to facilitate implantation. With the thread runouts, the holding strength of the screw may be compromised. To the best of our knowledge, no study has examined the pullout force of the global sizes of a HCS. We sought to determine the pullout strength of the HLR and compare the strength of this screw with that of the Mini-Acutrak 2...
May 24, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/26962488/minimally-invasive-surgical-treatment-for-unstable-fractures-of-the-proximal-phalanx-intramedullary-screw
#8
Marcio Aurélio Aita, Paulo Augusto Castro Mos, Gisele de Paula Cardoso Marques Leite, Rafael Saleme Alves, Marcos Vinicius Credídio, Eduardo Fernandes da Costa
OBJECTIVE: To analyze the clinical-functional parameters and quality of life of patients undergoing minimally invasive surgical treatment for extra-articular fractures of the proximal phalanx, using an intramedullary screw (Acutrak(®)). METHODS: Between January 2011 and September 2014, a prospective study was conducted on 41 patients (48 fingers) with unstable extra-articular fractures of the proximal phalanx, who underwent minimally invasive surgical treatment using an intramedullary screw (Acutrak(®))...
January 2016: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/26871789/transverse-stress-fracture-of-the-proximal-patella-a-case-report
#9
Satoru Atsumi, Yuji Arai, Ko Kato, Akinobu Nishimura, Shigeto Nakazora, Shuji Nakagawa, Kazuya Ikoma, Hiroyoshi Fujiwara, Akihiro Sudo, Toshikazu Kubo
Among stress fractures associated with sports activities, patellar stress fracture is rare. Regarding patella stress fractures, so far only distal transverse or lateral longitudinal fractures have been reported, but there are no reports of transverse fractures occurring in the proximal patella. We describe an extremely rare case of transverse stress fracture of proximal patella in a 9-year-old athlete.A 9-year old boy, who participated in sports (sprints and Kendo) presented with left knee pain without any external injury...
February 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/26869501/biomechanical-evaluation-of-a-second-generation-headless-compression-screw-for-ankle-arthrodesis-in-a-cadaver-model
#10
Andrew Max Somberg, William K Whiteside, Erik Nilssen, Daniel Murawski, Wei Liu
BACKGROUND: Many types of screws, plates, and strut grafts have been utilized for ankle arthrodesis. Biomechanical testing has shown that these constructs can have variable stiffness. More recently, headless compression screws have emerged as an evolving method of achieving compression in various applications but there is limited literature regarding ankle arthrodesis. The aim of this study was to determine the biomechanical stability provided by a second generation fully threaded headless compression screw compared to a standard headed, partially threaded cancellous screw in a cadaveric ankle arthrodesis model...
March 2016: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/26535195/experimental-trial-on-surgical-treatment-for-transverse-fractures-of-the-proximal-phalanx-technique-using-intramedullary-conical-compression-screw-versus-lateral-compression-plate
#11
Daniel Schneider Ibanez, Fabio Lucas Rodrigues, Rafael Salmeron Salviani, Fernando Augusto Reginatto Roberto, Jose Roberto Pengo Junior, Marcio Aurelio Aita
OBJECTIVE: To compare the mechanical parameters between two methods for stabilization through compression: 1.5 mm axial compression plate versus conical compression screw used as an intramedullary tutor. METHODS: Polyurethane models (Sawbone(®)) that simulated transverse fractures of the proximal phalanx were used. The models were divided into three groups: lateral plate, conical screw and no implant. RESULTS: Greater force was needed to result in fatigue in the synthesis using an intramedullary plate...
September 2015: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/26200411/biomechanical-comparison-of-headless-antegrade-screw-versus-retrograde-cortical-screw-for-coronoid-fracture-fixation
#12
COMPARATIVE STUDY
Onur Hapa, Ahmet Karakaşlı, Cemal Dinçer, Vadym Zhamilov, Mustafa Güvencer, Hasan Havitçioğlu
OBJECTIVE: Posterior-to-anterior directed screws are stronger than anterior-to-posterior directed screws for coronoid fracture fixation. Anterior approaches that facilitate direct reduction and fixation of coronoid fractures have been described. The present study was based on the hypothesis that anterior-to-posterior headless screw (Acutrak Mini® 3.5 mm × 26 mm, Acumed, Hillsboro, Oregon, USA) fixation of coronoid fractures would be as strong as posterior-to-anterior 2.7 mm Association for Osteosynthesis (AO) cortical screw fixation...
2015: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/26051768/the-effect-of-screw-design-on-union-rates-in-scaphoid-nonunions
#13
COMPARATIVE STUDY
Jiwei Wu, Shian Chao Tay, Alexander Y Shin
BACKGROUND: The purpose of this study is to compare the outcome of the conical fully threaded headless screw to that of a smooth shaft headless screw in a series of scaphoid nonunions requiring screw fixation to determine if screw design had an influence on union rates. METHODS: We retrospectively reviewed 104 cases of surgically treated scaphoid nonunions. After eliminating cases with our exclusion criteria, the study cohort had 40 cases for analysis. A comparison and analysis of union rates was undertaken between the fully threaded Acutrak 2 mini screw and the smooth shaft Herbert screw...
2015: Hand Surgery
https://www.readbyqxmd.com/read/26021662/should-full-threaded-compression-screws-be-used-in-adult-femoral-neck-fractures
#14
RANDOMIZED CONTROLLED TRIAL
Güvenir Okcu, Nadir Özkayın, Serkan Erkan, H Koray Tosyali, Kemal Aktuğlu
INTRODUCTION: Operative treatment consisting of fracture reduction and fixation, or arthroplasty to permit early patient mobilization, continues to be the treatment of choice for most femoral neck fractures. Options for internal fixation have included a variety of implants; however most recent reports and textbooks cite parallel multiple cancellous screws as the surgical technique of choice. METHODS: The study was prospective, randomized and IRB approved. Inclusion criteria included skeletal maturity, closed femoral neck fracture without concomitant fractures or injuries with complete charts and adequate radiographs obtained from the initial injury till the last follow-up...
July 2015: Injury
https://www.readbyqxmd.com/read/25998471/mechanical-comparison-of-headless-screw-fixation-and-locking-plate-fixation-for-talar-neck-fractures
#15
COMPARATIVE STUDY
Ahmet Karakasli, Onur Hapa, Mehmet Erduran, Cemal Dincer, Berivan Cecen, Hasan Havitcioglu
For talar neck fractures, open reduction and internal fixation have been thought to facilitate revascularization and prevent osteonecrosis. Newer screw systems allow for placement of cannulated headless screws, which provide compression by virtue of a variable pitch thread. The present study compared the biomechanical fixation strength of cannulated headless variable-pitch screw fixation and locking plate fixation. A reproducible talar neck fracture was created in 14 fresh cadaver talar necks. Talar head fixation was then performed using 2 cannulated headless variable-pitch 4-mm/5-mm diameter (4/5) screws (Acutrak; Acumed, Hillsboro, OR) and locking plate fixation...
September 2015: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/25666203/a-central-threadless-shaft-screw-is-better-than-a-fully-threaded-variable-pitch-screw-for-unstable-scaphoid-nonunion-a-biomechanical-study
#16
Il-Hyun Koh, Ho-Jung Kang, Ji-Sup Kim, Seong-Jin Park, Yun-Rak Choi
INTRODUCTION: An interpositional wedge bone graft is a procedure performed to restore carpal height and scaphoid length for displaced scaphoid nonunions with carpal instability. The purpose of this study was to investigate which headless screw design (threadless central shaft screw or fully threaded variable pitch compression screw) is biomechanically preferred when an interpositional bone graft is needed. METHODS: A total of 24 cadaveric scaphoid interpositional bone grafts were divided into three groups and fixed with HCS 3...
April 2015: Injury
https://www.readbyqxmd.com/read/25140263/bicondylar-hoffa-fracture-successfully-treated-with-headless-compression-screws
#17
Sang Yang Lee, Takahiro Niikura, Takashi Iwakura, Yoshitada Sakai, Ryosuke Kuroda, Masahiro Kurosaka
Bicondylar coronal plane fracture, eponymically named Hoffa fractures, is an extremely rare injury. We present a case of isolated unilateral bicondylar Hoffa fracture that was successfully treated with open reduction and internal fixation using headless compression screws with satisfactory results. We inserted posteroanteriorly oriented Acutrak screws perpendicular to the fracture plane via lateral parapatellar arthrotomy, which provided excellent compression across the fracture.
2014: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/24974416/-acutrak-headless-compression-screw-fixation-for-the-treatment-of-scaphoid-non-union
#18
Bing Xie, Jing Tian, Bing Liu, Yan-Feng Jing, Hai-Peng Xue, Da-Peng Zhou, Liang-Bi Xiang
OBJECTIVE: To evaluate the early clinical and radiographic outcome of scaphoid non-unions treated with Acutrak headless compression screw. METHODS: From January 2008 to July 2011,21 patients with scaphoid non-union were treated in our department. There were 18 males and 3 females with a mean age of (23.6 +/- 4.6) years; 12 cases were on right hand and 9 were on left. According to Herbert-Fisher classification, there were 10 cases with type D1, 7 cases with type D2, 3 cases with type D3, and 1 case with type D4...
March 2014: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/24641760/the-path-of-screw-insertion-for-stabilization-of-the-scapholunate-joint-a-cadaveric-study
#19
O M Flannery, L C Murphy, P Dockery, M E O'Sullivan
The aim of this study was to determine the path of screw placement to avoid breaching the articular surface of both lunate and scaphoid bones at the radiocarpal and midcarpal joints. An Acutrak screw was inserted into the right scapholunate joint of ten cadavers starting immediately distal to the tip of the radial styloid and aiming for the tip of the ulnar styloid. The articular surfaces of the scaphoid and lunate bones in all ten cadavers were exposed and examined. A computed tomography (CT) scan of four wrists was performed...
2014: Hand Surgery
https://www.readbyqxmd.com/read/24436361/metacarpophalangeal-and-interphalangeal-joint-arthrodesis-a-comparative-study-between-tension-band-and-compression-screw-fixation
#20
COMPARATIVE STUDY
J M Breyer, P Vergara, L Parra, P Sotelo, A Bifani, F Andrade
A retrospective, comparative cohort study was performed of metacarpophalangeal or proximal interphalangeal joint arthrodesis with either tension band (n = 28) or compression (Acutrak Mini) screw (n = 29) methods. We compared rate of union, healing time, complications, and re-operation rate. Union was achieved in 26/28 (92.8%) of the tension band group (9.4 weeks) and 24/28 (85.7%) of the compression screw group (9.8 weeks). Only 28 patients in the screw group were assessed for union as one patient in the screw group sustained a fracture at the time of insertion and was converted to tension band fixation...
May 2015: Journal of Hand Surgery, European Volume
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