Publications by authors named "Walenkamp M"

Purpose: To allow physicians to be more selective in their request for a radiograph of the wrist and to potentially reduce costs, the Amsterdam Wrist Rules (AWR) have been developed, externally validated, and recently also implemented. The aim of this study was to conduct an incremental cost analysis and budget impact analysis of the implementation of the AWR at the emergency department (ED) in the Netherlands.

Methods: A cost-minimisation analysis to determine the expected cost savings for implementation of the Amsterdam Wrist Rules.

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Introduction: The aim of this study was to develop and validate an easy to use clinical decision rule, applicable in the ED that limits the number of unnecessary cast immobilizations and diagnostic follow-up in suspected scaphoid injury, without increasing the risk of missing fractures.

Methods: A prospective multicenter study was conducted that consisted of three components: (1) derivation of a clinical prediction model for detecting scaphoid fractures in adult patients following wrist trauma; (2) internal validation of the model; (3) design of a clinical decision rule. The predictors used were: sex, age, swelling of the anatomic snuffbox, tenderness in the anatomic snuffbox, scaphoid tubercle tenderness, painful ulnar deviation and painful axial thumb compression.

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Background: To our knowledge, a health economic evaluation of volar plate fixation compared with plaster immobilization in patients with a displaced extra-articular distal radial fracture has not been previously conducted.

Methods: A cost-effectiveness analysis of a multicenter randomized controlled trial was performed. Ninety patients were randomly assigned to volar plate fixation or plaster immobilization.

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Purpose: While most patients with wrist trauma are routinely referred for radiography, around 50% of these radiographs show no fracture. To avoid unnecessary radiographs, the Amsterdam Wrist Rules (AWR) have previously been developed and validated. The aim of the current study was to evaluate the effect of the implementation of the AWR at the Emergency Department (ED).

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Background: There is no consensus as to whether displaced extra-articular distal radial fractures should be treated operatively or nonoperatively. We compared the outcomes of open reduction and volar plate fixation with closed reduction and plaster immobilization in adults with an acceptably reduced extra-articular distal radial fracture.

Methods: In this multicenter randomized controlled trial, patients 18 to 75 years old with an acceptably reduced extra-articular distal radial fracture were randomly assigned to open reduction and volar plate fixation or plaster immobilization.

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 Carpal alignment may be used as a tool to evaluate fracture reduction in patients with distal radius fractures. However, there is little consensus on how to measure and quantify carpal alignment.  The aim of this study was to compare the inter- and intraobserver variability of a new perpendicular method with the existing method in fractured and unfractured wrists.

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Objective: Insulin like growth factors-1 (IGF-1) is essential for normal and postnatal human growth. It mediates its effects through the IGF-1 receptor (IGF1R), a widely expressed cell surface tyrosine kinase receptor. The aim of the study was to analyze pre- and post-natal growth, clinical features and laboratory findings in a small for gestational age (SGA) girl in whom discordant postnatal growth persisted and her appropriate for gestational age (AGA) brother.

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Context: The phenotype and response to GH treatment of children with an IGF1R defect is insufficiently known.

Objective: To develop a clinical score for selecting children with short stature for genetic testing and evaluate the efficacy of treatment.

Design And Setting: Case series with an IGF1R defect identified in a university genetic laboratory.

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Article Synopsis
  • Transaldolase deficiency (TALDO-D) is a rare genetic disorder affecting the pentose phosphate pathway, first identified in 2001, with ongoing research focused on its symptoms and genetic links.* -
  • A study involving 34 patients revealed that most exhibited symptoms early in life, such as growth issues and heart defects, while some had delayed onset of symptoms, including hormonal abnormalities.* -
  • The findings provide insights for better patient management and family counseling, suggesting guidelines for diagnosis, treatment options, and understanding the disorder's mechanisms.*
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Background: The Amsterdam Pediatric Wrist Rules have been developed and validated to reduce wrist radiographs following wrist trauma in pediatric patients. However, the actual impact should be evaluated in an implementation study.

Objective: To evaluate the effect of implementation of the Amsterdam Pediatric Wrist Rules at the emergency department.

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Children born small for gestational age (SGA), defined as a birth weight and/or length below -2 SD score (SDS), comprise a heterogeneous group. The causes of SGA are multifactorial and include maternal lifestyle and obstetric factors, placental dysfunction, and numerous fetal (epi)genetic abnormalities. Short-term consequences of SGA include increased risks of hypothermia, polycythemia, and hypoglycemia.

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Objective: To externally validate the Edinburgh Wrist Calculator (EWC) in a population of patients with distal radius fractures at risk of loss of threshold alignment.

Design: A retrospective cohort study.

Setting: One academic hospital.

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Unlabelled: The aim of this study was to identify predictors of a superior functional outcome after corrective osteotomy for paediatric malunited radius and both-bone forearm fractures. We performed a systematic review and meta-analysis of individual participant data, searching databases up to 1 October 2016. Our primary outcome was the gain in pronosupination seen after corrective osteotomy.

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To position the volar plate on the distal radius fracture site, the pronator quadratus muscle needs to be detached from its distal and radial side and lifted for optimal exposure to the fracture site. Although the conventional approach involves repair of the pronator quadratus, controversy surrounds the merits of this repair. The purpose of this study was to compare the functional outcomes of patients with distal radius fractures treated with pronator quadratus repair after volar plate fixation versus no pronator quadratus repair.

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Eczema in children is a chronic disabling condition. The impact of this condition on the lives of families is often underestimated by conventional physicians. As a consequence parents may investigate complementary treatment options.

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Objective: The optimum treatment of patients with distal radius fracture has not been entirely clarified resulting in possible major variations between hospitals in the number of patients undergoing surgical treatment. The objective of this study was to examine the variation in surgical treatment rates of patients with distal radius fractures across Dutch hospitals.

Design: Retrospective study.

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Background: Clinical decision rules help to avoid potentially unnecessary radiographs of the wrist, reduce waiting times and save costs.

Objective: The primary aim of this study was to provide an overview of all existing non-validated clinical decision rules for wrist trauma in children and to externally validate these rules in a different cohort of patients. Secondarily, we aimed to compare the performance of these rules with the validated Amsterdam Pediatric Wrist Rules.

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This study describes a minimally invasive procedure for stabilization of the distal radioulnar joint, using a suture-button construct placed percutaneously in the direction of the distal oblique bundle in the distal interosseous membrane. In five cadaveric specimens, placement of the suture-button suspension system reduced dorsal displacement of the radius in an unstable distal radioulnar joint to baseline values, both in neutral position and in pronation and supination. These results indicate the possibility of minimally invasive treatment for distal radioulnar joint instability.

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Unlabelled: The purpose of this study was to examine the variation in surgical treatment rates of patients with distal radius fractures across Dutch hospitals. We obtained all reimbursement data for the treatment of distal radius fractures for 2012 and 2013 categorized by hospital. The surgical rate across hospitals was corrected for possible explanatory variables using linear regression analyses.

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Background: Although only 39% of patients with wrist trauma have sustained a fracture, the majority of patients is routinely referred for radiography. The purpose of this study was to derive and externally validate a clinical decision rule that selects patients with acute wrist trauma in the Emergency Department (ED) for radiography.

Method: This multicenter prospective study consisted of three components: (1) derivation of a clinical prediction model for detecting wrist fractures in patients following wrist trauma; (2) external validation of this model; and (3) design of a clinical decision rule.

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Background: Of all distal radius fractures, 25 % are complete articular fractures (AO/OTA type C fractures). Two thirds of those fractures are displaced and require reduction. According to several International Guidelines, adequately reduced intra-articular distal radius fractures are best treated non-operatively with plaster immobilisation, while surgical fixation is suggested only when the articular step exceeds 2 mm after reduction.

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Background: Although only 39 % of patients with wrist trauma have sustained a fracture, the majority of patients is routinely referred for radiography. The purpose of this study was to derive and externally validate a clinical decision rule that selects patients with acute wrist trauma in the Emergency Department (ED) for radiography.

Methods: This multicenter prospective study consisted of three components: (1) derivation of a clinical prediction model for detecting wrist fractures in patients following wrist trauma; (2) external validation of this model; and (3) design of a clinical decision rule.

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