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Prosthetic joint

Laura Prieto-Borja, Graciela Rodriguez-Sevilla, Alvaro Auñon, Concepción Pérez-Jorge, Enrique Sandoval, Joaquín Garcia-Cañete, Ignacio Gadea, Ricardo Fernandez-Roblas, Antonio Blanco, Jaime Esteban
BACKGROUND: The development of sonication protocols over the last few years has improved the sensitivity of conventional cultures for the diagnosis of prosthetic-joint infection (PJI). However, the development of a new, specifically designed kit for the molecular diagnosis of PJI could provide a major improvement in this field. METHODS: Prostheses retrieved from patients who underwent implant removal from May 2014 to May 2015 were sent for culture, and processed according to a previously defined protocol that included sonication...
October 18, 2016: Enfermedades Infecciosas y Microbiología Clínica
Michael Maceroli, Lucas E Nikkel, Bilal Mahmood, John P Ketz, Xing Qiu, Joseph Ciminelli, Susan Messing, John C Elfar
OBJECTIVES: To determine if hospital arthroplasty volume affects patient outcomes after undergoing total hip arthroplasty (THA) for displaced femoral neck fractures. METHODS: The Statewide Planning and Research Cooperative System database from the New York State Department of Health was used to group hospitals into quartiles based on overall THA volume from 2000 to 2010. The database was then queried to identify all patients undergoing THA specifically for femoral neck fracture during this time period...
November 2016: Journal of Orthopaedic Trauma
Mogeeb A El-Sheikh
PURPOSE: This work presents the mechanical design of 4 configurations of compliant fingers in order to address the need for commercially feasible prosthetic and robotic hands. METHODS: The fingers consist of a single part and utilize a compliant mechanism to reduce the cost and control complexity. The geometric parameters of the compliant finger designs follow the Fibonacci series. The first and second compliant fingers have 2 joints and 2 degrees of freedom. The others have 3 joints and 3 degrees of freedom...
October 18, 2016: International Journal of Artificial Organs
Chu-Qiang Qin, Dong-Sheng Huang, Chi Zhang, Bin Song, Jian-Bin Huang, Yue Ding
BACKGROUND: Aseptic loosening is a significant impediment to joint implant longevity. Prosthetic wear particles are postulated to play a central role in the onset and progression of periprosthetic osteolysis, leading to aseptic loosening of the prosthesis. METHODS: We investigated the inhibitory effects of a lentivirus-mediated short hairpin RNA that targets the TNF-alpha gene on the particle-induced inflammatory and osteolytic changes via macrophages both in vitro and in vivo...
October 18, 2016: BMC Musculoskeletal Disorders
Mareike Klinger-Strobel, Oliwia Makarewicz, Mathias W Pletz, Andreas Stallmach, Christian Lautenschläger
Biofilm formation, also known as microfouling, on indwelling medical devices such as catheters or prosthetic joints causes difficult to treat and recurrent infections. It is also the initial step for biocorrosion of surfaces in aquatic environment. An efficient prevention of microfouling is preferable but the development of antibiofilm surfaces is enormously challenging. Therefore, soda-lime, aluminosilicate, and three borosilicate glasses with different TiO2 and ZnO compositions were investigated on their feasibility to prevent biofilm formation by standardized in vitro biofilm assays using different pathogenic bacteria...
December 2016: Journal of Materials Science. Materials in Medicine
Sara C Keller, Sara E Cosgrove, Yvonne Higgins, Damani A Piggott, Greg Osgood, Paul G Auwaerter
Background.  The use of suppressive antibiotics in treatment of orthopedic hardware infections (OHIs), including spinal hardware infections, prosthetic joint infections, and infections of internal fixation devices, is controversial. Methods.  Over a 4-year period at 2 academic medical centers, patients with OHI who were treated with debridement and retention of hardware components, with single-stage exchange, or without surgery were studied to determine whether use of oral antibiotics for at least 6 months after diagnosis impacts successful treatment of the infection at 1 year after diagnosis...
October 2016: Open Forum Infectious Diseases
Robert D Gregg, Anne E Martin
Recent work has extended the control method of virtual constraints, originally developed for autonomous walking robots, to powered prosthetic legs for lower-limb amputees. Virtual constraints define desired joint patterns as functions of a mechanical phasing variable, which are typically enforced by torque control laws that linearize the output dynamics associated with the virtual constraints. However, the output dynamics of a powered prosthetic leg generally depend on the human interaction forces, which must be measured and canceled by the feedback linearizing control law...
July 2016: Proceedings of the ... American Control Conference
Daniel Pérez-Prieto, María E Portillo, Lluís Puig-Verdié, Albert Alier, Carlo Gamba, Pau Guirro, Santos Martínez-Díaz, Juan P Horcajada, Andrej Trampuz, Joan C Monllau
BACKGROUND: Culture negative prosthetic joint infections (PJI) still remain an issue even with the advantages of the new diagnostic tools for PJI. This is why some orthopedic surgeons have reservations relative to the use of preoperative antibiotic prophylaxis when a PJI is suspected. The purpose of the present study was to evaluate the influence of preoperative antibiotic prophylaxis on intraoperative cultures. MATERIAL AND METHODS: An enhanced diagnostic protocol for PJI (Zimmerli criteria) was used for the inclusion criteria in order to collect all PJI that were seen in a university hospital...
September 23, 2016: Diagnostic Microbiology and Infectious Disease
M Bricout, J Rezzouk
When implanting the Maia(®) trapeziometacarpal prosthesis, surgeons will be faced with a variety of complications they must be able to recognize and anticipate. Their ability to deal with these complications and possibly even failures is governed by their knowledge of the right steps to take. The aim of this retrospective study was to assess the incidence of complications reported during implantation of the Maia(®) prosthesis, to describe their nature and potential predisposing factors, and to study failures and their outcomes...
June 2016: Hand Surgery and Rehabilitation
E Fiaux, M Titecat, O Robineau, J Lora-Tamayo, Y El Samad, M Etienne, N Frebourg, N Blondiaux, B Brunschweiler, F Dujardin, E Beltrand, C Loiez, V Cattoir, J P Canarelli, C Hulet, M Valette, S Nguyen, F Caron, H Migaud, E Senneville
BACKGROUND: Outcome of patients with streptococcal prosthetic joint infections (PJIs) is not well known. METHODS: We performed a retrospective multicenter cohort study that involved patients with total hip/knee prosthetic joint (THP/TKP) infections due to Streptococcus spp. from 2001 through 2009. RESULTS: Ninety-five streptococcal PJI episodes (50 THP and 45 TKP) in 87 patients of mean age 69.1 ± 13.7 years met the inclusion criteria...
October 13, 2016: BMC Infectious Diseases
Shin Xu, Dustin K Baker, Justin C Woods, Eugene W Brabston, Brent A Ponce
Hospital readmissions are costly for patients and institutions. We conducted a study to evaluate rates of readmission within 30 days after anatomical total shoulder arthroplasty (ATSA) and reverse total shoulder arthroplasty (RTSA) and to determine independent risk factors for readmission. We queried the National Surgical Quality Improvement Program database for ATSAs and RTSAs performed between 2011 and 2013 and found a combined total of 3501 cases and an overall readmission rate of 2.7%. Of the readmissions, 67% were for medical complications, and 33% were for surgical complications...
September 2016: American Journal of Orthopedics
Edwin J Meneses-Gómez, Adriana Posada-López, Andrés A Agudelo-Suarez
Metrosalud is the largest public hospital network in the city of Medellin and one of the most important in Colombia providing health care to the most vulnerable population. The objective of the study was to determine the Oral HealthRelated Quality of Life (OHRQoL) and its related factors in the elderly population receiving health care at the public hospital network in Medellin (Colombia). A crosssectional design was used. Men and women ≥ 65 years old were considered for this research, selected from first consultation records by the institution's statistical unit for 2011, who accepted to participate after being contacted by telephone...
September 2016: Acta Odontológica Latinoamericana: AOL
Shuai Zhao, Yu Sun, Xiaolei Li, Jingcheng Wang, Lianqi Yan, Zhen Zhang, Daxin Wang, Jihang Dai, Jun He, Shuguang Wang
Aseptic prosthetic loosening is a major complication after hip joint replacement. Wear particle-induced periprosthetic osteolysis plays a key role in aseptic prosthetic loosening. Attempting to modulate receptor activator of nuclear factor-κB (RANKL) mediated signaling pathways is a promising strategy to prevent aseptic prosthetic loosening. In the present study, we determined the effect of scutellarin (SCU) on titanium (Ti) particle-induced osteolysis in a mouse calvarial model and RANKL-mediated osteoclastogenesis...
October 8, 2016: International Immunopharmacology
Dipit Sahu, James S Fitzsimmons, Andrew R Thoreson, Kai-Nan An, Shawn W O'Driscoll
BACKGROUND: Metallic radial head prostheses are often used in the management of comminuted radial head fractures and elbow instability. We hypothesized that during radiocapitellar subluxation, the contact pressure characteristics of an anatomic radial head prosthesis will more closely mimic those of the native radial head compared with a monopolar circular or a bipolar circular radial head design. MATERIALS AND METHODS: With use of 6 fresh frozen cadaver elbows, mean radiocapitellar contact pressures, contact areas, and peak pressures of the native radial head were assessed at 0, 2, 4, and 6 mm of posterior subluxation...
October 7, 2016: Journal of Shoulder and Elbow Surgery
Arianna Barbara Lovati, Marta Bottagisio, Elena de Vecchi, Enrico Gallazzi, Lorenzo Drago
The demand for joint replacement and surgical treatment is continuously increasing, thus representing a clinical burden and a cost for the healthcare system. Among several pathogens involved in implant-related infections, staphylococci account for the two-thirds of clinically isolated bacteria. Despite most of them are highly virulent microorganisms (Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa), low virulent bacteria (Staphylococcus epidermidis, Propionibacterium acnes) are responsible for delayed, low-grade infections without specific clinical signs and hardly distinguishable from aseptic prosthetic failure...
October 9, 2016: Advances in Experimental Medicine and Biology
R Grunert, S Schleifenbaum, R Möbius, G Sommer, D Zajonz, N Hammer, T Prietzel
Background: In total hip arthroplasty (THA), femoral head diameter has not been regarded as a key parameter which should be restored when reconstructing joint biomechanics and geometry. Apart from the controversial discussion on the advantages and disadvantages of using larger diameter heads, their higher cost is another important reason that they have only been used to a limited extent. The goal of this study was to analyse the price structure of prosthetic heads in comparison to other components used in THA...
October 7, 2016: Zeitschrift Für Orthopädie und Unfallchirurgie
Oddvar Oppegaard, Steinar Skrede, Haima Mylvaganam, Bård Reiakvam Kittang
BACKGROUND: Beta-haemolytic streptococci are important contributors to the global burden of osteoarticular infections (OAI). Knowledge on the disease traits specific for streptococcal OAI, however, remains scarce. We wished to explore temporal trends of OAI caused by Group A Streptococci (GAS), Group B Streptococci (GBS) and Group C and G Streptococci (GCGS), and furthermore, to describe the associated host and pathogen characteristics. METHODS: All cases of microbiologically verified β-haemolytic streptococcal OAI in Health Region Bergen, Norway, in the period 1999-2013 were retrospectively identified...
October 4, 2016: BMC Infectious Diseases
A J Schreiner, F Stuby, P M de Zwart, B G Ochs
In contrast to periprosthetic fractures of the femur, periprosthetic fractures of the acetabulum are rare complications - both primary fractures and fractures in revision surgery. This topic is largely under-reported in the literature; there are a few case reports and no long term results. Due to an increase in life expectancy, the level of patients' activity and the number of primary joint replacements, one has to expect a rise in periprosthetic complications in general and periprosthetic acetabular fractures in particular...
October 6, 2016: Zeitschrift Für Orthopädie und Unfallchirurgie
Gregory C Wernecke, Ian A Harrris, Bradley G Seeto, Darren B Chen, Samuel J MacDessi
BACKGROUND: Rotational alignment of prosthetic components in total knee arthroplasty (TKA) is important to successful outcomes. Component malrotation is a known cause of revision and understanding normal rotational alignment may help recreate normal joint kinematics. To date, no large MRI study assessing femorotibial rotational alignment in nonarthritic knees has been undertaken. QUESTIONS/PURPOSES: Is Insall's tibial axis a reliable rotational landmark against common femoral rotational axes in the nonarthritic patient population? METHODS: We reviewed 544 knee MRI scans performed for suspected soft tissue pathology and identified Insall's tibial rotational axis as well as the femoral clinical trans-epicondylar axis (TEAc), femoral surgical trans-epicondylar axis (TEAs), posterior condylar articular axis (PCA), and a modified Eckhoff's cylindrical axis...
October 2016: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
N Bottomley, L D Jones, R Rout, A Alvand, I Rombach, T Evans, W F M Jackson, D J Beard, A J Price
AIMS: The aim of this to study was to compare the previously unreported long-term survival outcome of the Oxford medial unicompartmental knee arthroplasty (UKA) performed by trainee surgeons and consultants. PATIENTS AND METHODS: We therefore identified a previously unreported cohort of 1084 knees in 947 patients who had a UKA inserted for anteromedial knee arthritis by consultants and surgeons in training, at a tertiary arthroplasty centre and performed survival analysis on the group with revision as the endpoint...
October 2016: Bone & Joint Journal
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