Diederik PJ Smeeing

Dr. Diederik PJ Smeeing

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Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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19 February 2015 in PLOS ONE
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DSDiederik PJ Smeeing
Diederik PJ Smeeing
RHRoderick M Houwert
Roderick M Houwert
JBJan Paul Briet
Jan Paul Briet
JKJohannes C Kelder
Johannes C Kelder
MSMichiel J M Segers
Michiel J M Segers
FHFalco Hietbrink
Falco Hietbrink
To determine the effectiveness and safety of interventions used for rehabilitation after open reduction and internal fixation of ankle fractures. A systematic review and meta-analysis was performed using both randomized trials and cohort studies. The effect of mobilization, weight-bearing, and unprotected weight-bearing as tolerated on postoperative recovery was compared using the Olerud Molander score, return to work/daily activities, and the rate of complications. A total of 25 articles were included. Ankle exercises resulted in earlier return to work and/or daily activities compared to immobilization (mean difference (MD) -20.76 days; 95% confidence interval (CI) -40.02 to -1.50). There was no difference in the rate of complications between exercises and immobilization (risk ratio (RR) 1.22; 95% CI 0.60 to 2.45) or between early and late weight-bearing (RR 1.26; 95%CI 0.56 to 2.85). Results of this meta-analysis show that following ankle surgery, 1) active exercises accelerate return to work and daily activities compared to immobilization, 2) early weight-bearing tends to accelerate return to work and daily activities compared to late weight-bearing. Active exercises in combination with immediate weight-bearing may be a safe option.

18 November 2016 in The American Journal of Sports Medicine
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Journal Article
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DSDiederik PJ Smeeing
Diederik PJ Smeeing
DVDenise J.C. van der Ven
Denise J.C. van der Ven
FHFalco Hietbrink
Falco Hietbrink
TTTim K. Timmers
Tim K. Timmers
MHMark van Heijl
Mark van Heijl
RHRoderick M. Houwert
Roderick M. Houwert
Background: There is no consensus on the choice of treatment of midshaft clavicle fractures (MCFs). Purpose: The aims of this systematic review and meta-analysis were (1) to compare fracture healing disorders and functional outcomes of surgical versus nonsurgical treatment of MCFs and (2) to compare effect estimates obtained from randomized controlled trials (RCTs) and observational studies. Study Design: Systematic review and meta-analysis. Methods: The PubMed/MEDLINE, Embase, CENTRAL, and CINAHL databases were searched for both RCTs and observational studies. Using the MINORS instrument, all included studies were assessed on their methodological quality. The primary outcome was a nonunion. Effects of surgical versus nonsurgical treatment were estimated using random-effects meta-analysis models. Results: A total of 20 studies were included, of which 8 were RCTs and 12 were observational studies including 1760 patients. Results were similar across the different study designs. A meta-analysis of 19 studies revealed that nonunions were significantly less common after surgical treatment than after nonsurgical treatment (odds ratio [OR], 0.18 [95% CI, 0.10-0.33]). The risk of malunions did not differ between surgical and nonsurgical treatment (OR, 0.38 [95% CI, 0.12-1.19]). Both the long-term Disabilities of the Arm, Shoulder and Hand (DASH) and Constant-Murley scores favored surgical treatment (DASH: mean difference [MD], −2.04 [95% CI, −3.56 to −0.52]; Constant-Murley: MD, 3.23 [95% CI, 1.52 to 4.95]). No differences were observed regarding revision surgery (OR, 0.85 [95% CI, 0.42-1.73]). Including only high-quality studies, both the number of malunions and days to return to work show significant differences in favor of surgical treatment (malunions: OR, 0.26 [95% CI, 0.07 to 0.92]; return to work: MD, −8.64 [95% CI, −16.22 to −1.05]). Conclusion: This meta-analysis of high-quality studies showed that surgical treatment of MCFs results in fewer nonunions, fewer malunions, and an accelerated return to work compared with nonsurgical treatment. A meta-analysis of surgical treatments need not be restricted to randomized trials, provided that the included observational studies are of high quality.

1 September 2018 in The Journal of Foot and Ankle Surgery
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DSDiederik PJ Smeeing
Diederik PJ Smeeing
JBJan P. Briet
Jan P. Briet
CKCharlotte S. van Kessel
Charlotte S. van Kessel
MSMichiel M. Segers
Michiel M. Segers
EVEgbert J. Verleisdonk
Egbert J. Verleisdonk
FHFalco Hietbrink
Falco Hietbrink

31 May 2016 in Cerebrovascular Diseases
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DSDiederik PJ Smeeing
Diederik PJ Smeeing
JHJeroen Hendrikse
Jeroen Hendrikse
EPEsben T. Petersen
Esben T. Petersen
MDManus J. Donahue
Manus J. Donahue
JVJill B. de Vis
Jill B. de Vis
Background: The cerebrovascular reactivity (CVR) results of blood oxygen level-dependent (BOLD) and arterial spin labeling (ASL) MRI studies performed in patients with cerebrovascular disease (steno-occlusive vascular disease or stroke) were systematically reviewed. Summary: Thirty-one articles were included. Twenty-three (74.2%) studies used BOLD MRI to evaluate the CVR, 4 (12.9%) studies used ASL MRI and 4 (12.9%) studies used both BOLD and ASL MRI. Thirteen studies (3 significant) found a lower BOLD CVR, 2 studies found a similar CVR and 3 studies found a higher CVR in the ipsilateral compared to the contralateral hemisphere. Nine (5 significant) out of 10 studies found a lower BOLD CVR in the ipsilateral hemispheres of patients compared to controls. Six studies (2 significant) found a lower ASL CVR in the ipsilateral compared to the contralateral hemispheres. Three out of 5 studies found a significant lower ASL CVR in the ipsilateral hemispheres of patients compared to controls. Key Messages: This review brings support for a reduced BOLD and ASL CVR in the ipsilateral hemisphere of patients with cerebrovascular disease. We suggest that future studies will be performed in a uniform way so reference values can be established and could be used to guide treatment decisions in patients with cerebrovascular disease.

1 April 2016 in Injury
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SFSteven Ferree
Steven Ferree
RHRoderick M. Houwert
Roderick M. Houwert
JLJacqueline J.E.M van Laarhoven
Jacqueline J.E.M van Laarhoven
DSDiederik PJ Smeeing
Diederik PJ Smeeing
LLLuke L.P.H. LEENEN
Luke L.P.H. LEENEN
FHFalco Hietbrink
Falco Hietbrink

14 August 2019 in World Journal of Emergency Surgery
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FHFalco Hietbrink
Falco Hietbrink
DSDiederik PJ Smeeing
Diederik PJ Smeeing
SKSteffi Karhof
Steffi Karhof
HJHenk Formijne Jonkers
Henk Formijne Jonkers
MHMarijn Houwert
Marijn Houwert
LLLuke L.P.H. LEENEN
Luke L.P.H. LEENEN
Far reaching sub-specialization tends to become obligatory for surgeons in most Western countries. It is suggested that exposure of surgeons to emergency laparotomy after trauma is ever declining. Therefore, it can be questioned whether a generalist (i.e., general surgery) with additional differentiation such as the trauma surgeon, will still be needed and can remain sufficiently qualified. This study aimed to evaluate volume trends and outcomes of emergency laparotomies in trauma. A retrospective cohort study was performed in the University Medical Center Utrecht between January 2008 and January 2018, in which all patients who underwent an emergency laparotomy for trauma were included. Collected data were demographics, trauma-related characteristics, and number of (planned and unplanned) laparotomies with their indications. Primary outcome was in-hospital mortality; secondary outcomes were complications, length of ICU, and overall hospital stay. A total of 268 index emergency laparotomies were evaluated. Total number of patients who presented with an abdominal AIS > 2 remained constant over the past 10 years, as did the percentage of patients that required an emergency laparotomy. Most were polytrauma patients with a mean ISS = 27.5 (SD ± 14.9). The most frequent indication for laparotomy was hemodynamic instability or ongoing blood loss (44%).Unplanned relaparotomies occurred in 21% of the patients, mostly due to relapse of bleeding. Other complications were anastomotic leakage (8.6%), intestinal leakage after bowel contusion (4%). In addition, an incisional hernia was found in 6.3%. Mortality rate was 16.7%, mostly due to neurologic origin (42%). Average length of stay was 16 days with an ICU stay of 5 days. This study shows a persistent number of patients requiring emergency laparotomy after (blunt) abdominal trauma over 10 years in a European trauma center. When performed by a dedicated trauma team, this results in acceptable mortality and complication rates in this severely injured population.