Search results for: T. Mäkelä

Items from 1 to 20 out of 52 results

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PET/CT to detect adverse reactions to metal debris in patients with metal‐on‐metal hip arthroplasty: an exploratory prospective study

Erik Aro, Marko Seppänen, Keijo T. Mäkelä, Pauliina Luoto, more

Clinical Physiology and Functional Imaging > 38 > 5 > 847 - 855

Metal‐on‐metal (MoM) bearings in total hip arthroplasties and hip resurfacing arthroplasties have recently shown a new type of complication: adverse reactions to metal debris (ARMD). ARMD is characterized by local severe inflammation and tissue necrosis leading to implant failures. The gluteal muscle region is important for the patient outcome after revision surgery. This prospective positron emission...

article

Fetal radiation dose in three common CT examinations during pregnancy – Monte Carlo study

A. Kelaranta, T. Mäkelä, T. Kaasalainen, M. Kortesniemi

Physica Medica > 2017 > 43 > C > 199-206

To determine fetal doses in different stages of pregnancy in three common computed tomography (CT) examinations: pulmonary CT angiography, abdomino-pelvic and trauma scan with Monte Carlo (MC) simulations.An adult female anthropomorphic phantom was scanned with a 64-slice CT using pulmonary angiography, abdomino-pelvic and trauma CT scan protocols. Three different sized gelatin boluses placed on the...

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Does the Risk of Rerevision Vary Between Porous Tantalum Cups and Other Cementless Designs After Revision Hip Arthroplasty?

Inari Laaksonen, Michelle Lorimer, Kirill Gromov, Ola Rolfson, more

Clinical Orthopaedics and Related Research® > 2017 > 475 > 12 > 3015-3022

Background Earlier results with porous tantalum acetabular cups in revision THA generally have been favorable. Recently there has been some evidence presented that porous tantalum cups might decrease the risk of rerevision in the setting of revision hip surgery performed owing to prosthetic joint infection (PJI). As the data supporting this assertion come from a study with a limited study population,...

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Survival of uncemented cups from a single manufacturer implanted from 1985 to 2013: Finnish Arthroplasty Register data

Antton Palomäki, Lasse Lempainen, Markus Matilainen, Antti Eskelinen, more

Archives of Orthopaedic and Trauma Surgery > 2017 > 137 > 3 > 311-320

Introduction Total hip arthroplasty (THA) with uncemented implants has been a relatively common procedure in Finland during the recent decades. The most common brand of uncemented implants was chosen for further analysis to study the survivorship of this uncemented cup design in comparison to cemented references. Patients, materials and methods Since 1980, The Finnish Arthroplasty Register has collected...

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Outcomes of the Recalled Articular Surface Replacement Metal-on-Metal Hip Implant System: A Systematic Review

Inari Laaksonen, Gabrielle S. Donahue, Rami Madanat, Keijo T. Makela, more

The Journal of Arthroplasty > 2017 > 32 > 1 > 341-346

The aim of this review was to synthesize the main findings of clinical studies that have evaluated outcomes of the articular surface replacement (ASR) Hip System.We performed a systematic literature search to identify all articles published between January 2008 and June 2015 that included ASR hip resurfacing arthroplasty (ASR HRA) or ASR total hip arthroplasty (ASR XL THA) outcomes according to the...

article

Experimental study on Ahmed's body drag coefficient for different yaw angles

F.J. Bello-Millán, T. Mäkelä, L. Parras, C. del Pino, more

Journal of Wind Engineering & Industrial Aerodynamics > 2016 > 157 > Complete > 140-144

We present experiments conducted in a wind tunnel to characterize yaw angle effects on the drag force acting on the Ahmed body with slant angle of 25°. The main contribution of this experimental work is to create a reliable database of drag coefficients under yawed conditions. For zero yaw angle, we find a small variation in the drag coefficient, C_D, for Reynolds number in the range 3×105−30×105,...

article

Anatomical and functional changes to the pelvic floor after robotic versus laparoscopic ventral rectopexy: a randomised study

Johanna K. Mäkelä-Kaikkonen, Tero T. Rautio, Sari Koivurova, Eija Pääkkö, more

International Urogynecology Journal > 2016 > 27 > 12 > 1837-1845

Introduction and hypothesis To compare the effect of laparoscopic and robot-assisted ventral rectopexy for posterior compartment procidentia on the pelvic floor anatomy and function. Methods A prospective randomised single-centre study was carried out of 29 female patients, who underwent robot-assisted or laparoscopic ventral mesh rectopexy for external or internal rectal prolapse with symptoms...

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Modular to Monoblock: Difficulties of Detaching the M²a-Magnum^TM Head Are Common in Metal-on-metal Revisions

Heikki Mäntymäki, Keijo T. Mäkelä, Tero Vahlberg, Joni Hirviniemi, more

Clinical Orthopaedics and Related Research® > 2016 > 474 > 9 > 1999-2005

Background Modern hip implants typically feature modular heads, which allow for easy exchange and removal from the femoral stem at the time of revision. However, owing to fretting, corrosion, or cold welding, the modular head may be difficult or impossible to separate from the underlying trunnion, especially if the implant has titanium interfaces between the head and the stem. We have repeatedly encountered...

article

The role of low CRP values in the prediction of the development of acute diverticulitis

Jyrki T. Mäkelä, Kai Klintrup, Tero Rautio

International Journal of Colorectal Disease > 2016 > 31 > 1 > 23-27

Purpose Computed tomography (CT) is the most appropriate imaging modality for the assessment of acute diverticulitis at the emergency unit. The aim of this study was to determine the clinical outcome of the patients presented first time with symptoms of acute diverticulitis and low CRP values. Methods Two-hundred patients, who presented with the symptoms of acute diverticulitis and had CRP values...

article

Simultaneous meningitis, sepsis and prosthetic hip infection caused by group B Streptococcus

Anu Maksimow, Matti Seppänen, Mikko Karvonen, Keijo T. Mäkelä

European Orthopaedics and Traumatology > 2015 > 6 > 4 > 475-477

article

Dry paths effectively reduce road mortality of small and medium-sized terrestrial vertebrates

Milla Niemi, Niina C. Jääskeläinen, Petri Nummi, Tiina Mäkelä, more

Journal of Environmental Management > 2014 > 144 > Complete > 51-57

Wildlife passages are widely used mitigation measures designed to reduce the adverse impacts of roads on animals. We investigated whether road kills of small and medium-sized terrestrial vertebrates can be reduced by constructing dry paths adjacent to streams that pass under road bridges. The study was carried out in southern Finland during the summer of 2008. We selected ten road bridges with dry...

article

A register for patients undergoing shoulder surgery—perspectives in training of surgeons

Ville Äärimaa, Juha Kukkonen, Keijo T. Mäkelä, Tommi Kauko, more

European Orthopaedics and Traumatology > 2014 > 5 > 1 > 25-29

Background and aims The aim of this study was to investigate the results of rotator cuff reconstructions related to surgical experience. Materials and methods Since August 2007, all patients (excluding joint replacements) undergoing elective shoulder surgery at our institution have been enrolled into the structural database. The register contains now more than 2,700 operated shoulders with various...

article

Organic, elemental and water-soluble organic carbon in size segregated aerosols, in the marine boundary layer of the Eastern Mediterranean

A. Bougiatioti, P. Zarmpas, E. Koulouri, M. Antoniou, more

Atmospheric Environment > 2013 > 64 > Complete > 251-262

To assess the origin and transformation of carbonaceous material in the marine boundary layer of the Eastern Mediterranean, a total of 111 size segregated aerosol samples have been collected using a 12-stage Small-Deposit-area low-volume-Impactor (SDI) covering an almost 3 year period. The samples have been analyzed for organic (OC), elemental (EC), water-soluble organic carbon (WSOC) and ionic components...

article

Integration of rotated 3-D structures into pre-patterned PMMA substrate using step & stamp nanoimprint lithography

T. Haatainen, T. Mäkelä, A. Schleunitz, G. Grenci, more

Microelectronic Engineering > 2012 > 98 > Complete > 180-183

In this work, we fabricated hybrid micron-scale blazed grating structures on top of linear nanoscale gratings by superimposing thermal nanoimprint process. A poly(methyl methacrylate) (PMMA) substrate was at first pre-patterned with a nanoscale binary line grating by thermal NIL. The second imprint was added into the linear surface-gratings by sequential thermal imprinting using a stamp with micron-scale...

article

Hip arthroplasty after failed nailing of proximal femoral fractures

J. Mokka, K. Kirjasuo, M. Koivisto, P. Virolainen, more

European Orthopaedics and Traumatology > 2012 > 3 > 4 > 231-237

Background and aims Hip arthroplasty has been advocated as a salvage procedure after failed nailing of proximal femoral fractures. The aim of the current study was to evaluate chirurgical complications of hip arthroplasty after failed nailing of proximal femoral fractures. The second aim was to compare the complication profile of semiendoprosthesis (SEP) to that of total endoprosthesis (TEP). Materials...

article

Surgical treatment of colorectal cancer in patients aged over 80 years

Jyrki T. Mäkelä, Heikki Kiviniemi

International Journal of Colorectal Disease > 2012 > 27 > 8 > 1055-1060

Purpose The aim of this study was to identify the clinical factors and tumour characteristics that predict the outcome in patients older than 80 years with colorectal cancer. Patients and methods One hundred and four patients with colorectal cancer aged over 80 years were identified from a computer database, and their clinical variables were analysed by both univariate and multivariate analyses...

article

Clinicopathological features of colorectal cancer in patients under 40 years of age

Jyrki T. Mäkelä, Heikki Kiviniemi

International Journal of Colorectal Disease > 2010 > 25 > 7 > 823-828

Objective The aim was to identify the clinical factors and tumour characteristics that predict survival in patients younger than 40 years with colorectal adenocarcinoma. Material and methods Fifty-nine patients with colorectal cancer aged under 40 years were identified from a computer database, and their clinical variables were analysed. The factors predicting long-term survival were compared by...

article

Geographical variation in incidence of primary total hip arthroplasty: a population-based analysis of 34,642 replacements

Keijo T. Mäkelä, Mikko Peltola, Unto Häkkinen, Ville Remes

Archives of Orthopaedic and Trauma Surgery > 2010 > 130 > 5 > 633-639

Background Considerable variation in total hip arthroplasty (THA) incidence between regions has been described. The aim of this study was to evaluate geographical variation in the incidence of primary THA for OA in Finland and to analyze variables associated with this variation. Methods Using Hospital Discharge Register, 34,642 THAs performed for primary OA over the 1998 and 2005 period were identified...

article

Imprinted polymer stamps for UV-NIL

T. Haatainen, T. Mäkelä, J. Ahopelto, Y. Kawaguchi

Microelectronic Engineering > 2009 > 86 > 11 > 2293-2296

Thermal step and stamp nanoimprint lithography (SSIL) offers an alternative to fabricate transparent polymer stamps for UV-imprinting. The fabrication process does not require any other subsequent steps, e.g. dry etching or anti adhesive coating.In this work, we have manufactured UV-stamp by combining patterns of two different silicon masters. The patterns of the silicon masters were transferred into...

article

Comparison of current density viability imaging at rest with FDG-PET in patients after myocardial infarction

M. Goernig, J. Haueisen, J. Schreiber, U. Leder, more

Computerized Medical Imaging and Graphics > 2009 > 33 > 1 > 1-6

The assessment of myocardial viability is a major diagnostic challenge in patients with coronary artery disease (CAD) after myocardial infarction. Novel threedimensional current density (CD) imaging algorithms use high-resolution magnetic field mapping to determine the electrical activity of myocardial segments at rest. We, for the first time, compared CD activity obtained with several algorithms...

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Search results for: T. Mäkelä

PET/CT to detect adverse reactions to metal debris in patients with metal‐on‐metal hip arthroplasty: an exploratory prospective study

Fetal radiation dose in three common CT examinations during pregnancy – Monte Carlo study

Does the Risk of Rerevision Vary Between Porous Tantalum Cups and Other Cementless Designs After Revision Hip Arthroplasty?

Survival of uncemented cups from a single manufacturer implanted from 1985 to 2013: Finnish Arthroplasty Register data

Outcomes of the Recalled Articular Surface Replacement Metal-on-Metal Hip Implant System: A Systematic Review

Experimental study on Ahmed's body drag coefficient for different yaw angles

Anatomical and functional changes to the pelvic floor after robotic versus laparoscopic ventral rectopexy: a randomised study

Modular to Monoblock: Difficulties of Detaching the M²a-Magnum^TM Head Are Common in Metal-on-metal Revisions

The role of low CRP values in the prediction of the development of acute diverticulitis

Simultaneous meningitis, sepsis and prosthetic hip infection caused by group B Streptococcus

Dry paths effectively reduce road mortality of small and medium-sized terrestrial vertebrates

A register for patients undergoing shoulder surgery—perspectives in training of surgeons

Organic, elemental and water-soluble organic carbon in size segregated aerosols, in the marine boundary layer of the Eastern Mediterranean

Integration of rotated 3-D structures into pre-patterned PMMA substrate using step & stamp nanoimprint lithography

Hip arthroplasty after failed nailing of proximal femoral fractures

Surgical treatment of colorectal cancer in patients aged over 80 years

Clinicopathological features of colorectal cancer in patients under 40 years of age

Geographical variation in incidence of primary total hip arthroplasty: a population-based analysis of 34,642 replacements

Imprinted polymer stamps for UV-NIL

Comparison of current density viability imaging at rest with FDG-PET in patients after myocardial infarction

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