Wesley W. E. S. Theunissen

Dr. Wesley W. E. S. Theunissen


Research Focus & Metrics

Academic Career Length

13Years (2014-Present)

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

Representative Publications

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23 September 2022 in BMJ Open
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Journal Article
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WTWesley W. E. S. Theunissen
Wesley W. E. S. Theunissen
MSMaria Christine van der Steen
Maria Christine van der Steen
VVvan Veen
van Veen
FDFqmp van Douveren
Fqmp van Douveren
MWMa Witlox
Ma Witlox
JTJj Tolk
Jj Tolk
Objective The aim of this qualitative study was to explore the experiences of Dutch parents of children with developmental dysplasia of the hip (DDH), treated with a Pavlik harness, during the diagnostic and treatment process in the first year of life. Design A qualitative study by means of semistructured interviews was conducted between September and December 2020. Qualitative content analysis was applied to code, categorise and thematise data. Setting A large, tertiary referral centre for paediatric orthopaedics in the Netherlands. Participants A purposive sample of parents of children aged younger than 1 year, who were treated for DDH with a Pavlik harness, were interviewed until data saturation was achieved. A total of 20 interviews with 22 parents were conducted. Results Five main themes emerged: (1) positive experiences with professionals and peers, (2) insufficient information, (3) treatment concerns, (4) difficulties parenting and (5) emotional burden. Most prominent features that resonated across the interviews which led to insecurity by parents were: insufficient pre-hospital information, unfiltered online information and the lack of overview of the patient journey. Conclusion This study offers novel insights into parental experiences in DDH care. Parents were generally satisfied with DDH care provided by the hospital. The biggest challenges were to cope with (1) insufficient and unfiltered information, (2) the lack of patient journey overview and (3) practical problems and emotional doubts, which led to concerns during treatment. Future research and interventions should focus on optimising information provision and guidance with practical and emotional support for parents of children with DDH.

27 January 2014 in European Journal of Histochemistry
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Journal Article
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WTWesley W. E. S. Theunissen
Wesley W. E. S. Theunissen
DFDaniela Fanni
Daniela Fanni
SNS. Nemolato
S. Nemolato
EFE. Di Felice
E. Di Felice
TCTiziana Cabras
Tiziana Cabras
GFGavino Faa
Gavino Faa
Thymosin beta 4 and thymosin beta 10 expression in hepatocellular carcinoma

5 July 2023 in Bone & Joint Open
Verified
Journal Article
Open access
PDF file
WTWesley W. E. S. Theunissen
Wesley W. E. S. Theunissen
MSMaria Christine van der Steen
Maria Christine van der Steen
MVMerel R. Van Veen
Merel R. Van Veen
FDFlorens Q. M. P. Van Douveren
Florens Q. M. P. Van Douveren
AWAdhiambo M. Witlox
Adhiambo M. Witlox
Jaap J. TolkJaap J. Tolk
Jaap J. Tolk
Aims: The aim of this study was to identify the information topics that should be addressed according to the parents of children with developmental dysplasia of the hip (DDH) in the diagnostic and treatment phase during the first year of life. Second, we explored parental recommendations to further optimize the information provision in DDH care.Methods: A qualitative study with semi-structured interviews was conducted between September and December 2020. A purposive sample of parents of children aged younger than one year, who were treated for DDH with a Pavlik harness, were interviewed until data saturation was achieved. A total of 20 interviews with 22 parents were conducted. Interviews were audio recorded, transcribed verbatim, independently reviewed, and coded into categories and themes.Results: Interviews revealed four fundamental information topics that should be addressed in the different phases of the DDH healthcare trajectory: general information (screening phase), patient-specific information (diagnostic and treatment phase), practical information (treatment phase), and future perspectives (treatment and follow-up phase). To further optimize the information provision in DDH care, parents wished for more accessible and trustworthy general information prior to the first hospital visit to be better prepared for the diagnosis. Furthermore, parents wanted more personalized and visually supported information for a better understanding of the nature of the disease and the reason for treatment.Conclusion: This study offers novel insights to optimize the information provision in DDH care. The main finding is the shift in information need from general information in the screening phase to patient-specific information in the diagnostic and treatment phase of DDH. Parents prefer visually-supported information, provided in a timely fashion, and tailored to their child’s situation. These recommendations potentially decrease parental anxiety, insecurity, confusion, and increase parental empowerment and treatment adherence throughout the diagnostic and treatment phase of DDH.Cite this article: Bone Jt Open 2023;4(7):496–506.

12 February 2021 in Journal of Pediatric Orthopaedics
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Journal Article
Open access
WTWesley W. E. S. Theunissen
Wesley W. E. S. Theunissen
MSMarieke van der Steen
Marieke van der Steen
FDFlorens Q.M.P. van Douveren
Florens Q.M.P. van Douveren
AWAdhiambo M. Witlox
Adhiambo M. Witlox
Jaap J. TolkJaap J. Tolk
Jaap J. Tolk
Background: Worldwide a wide variation exists in duration of Pavlik harness treatment for infants up to 6 months with stable developmental dysplasia of the hip (DDH). The purpose of this study was to evaluate whether shortening the time to first routine follow-up ultrasound after initiation of Pavlik harness treatment would reduce treatment duration and whether this influenced radiologic outcome at 1 year of age. Furthermore, predictors of higher acetabular index (AI) at 1 year of age were investigated. Methods: A retrospective study was conducted in infants with stable DDH (Graf IIb and IIc) diagnosed and treated between 2015 and 2017. Two groups were identified: first routine follow-up ultrasound at 12 weeks after Pavlik harness initiation (group I) and first routine follow-up ultrasound at 6 weeks after Pavlik harness initiation (group II). In both groups, treatment was continued until repeat ultrasound measurements (every 6 wk) showed a normalized hip. Radiologic outcome at 1 year of age was defined as residual dysplasia measured on an anteroposterior hip radiograph according to the Tönnis table. Results: A total of 222 infants were included. The median time of Pavlik harness treatment was 12 weeks (interquartile range, 11.9 to 12.3) in group I compared with 6.1 weeks (interquartile range, 6.0 to 7.5) in group II (P<0.001). Residual dysplasia at 1 year of age was detected in 20 infants (16.8%) in group I compared with 11 infants (10.7%) in group II (P=0.189). The multivariable prediction model showed that positive family history and lower baseline alpha angle correlate with a higher AI at 1 year of age. Conclusions: First routine follow-up ultrasound can be safely brought forward from 12 to 6 weeks after Pavlik harness initiation. Furthermore, infants with a positive family history for DDH and an initial low alpha angle are at higher risk to have a higher AI at 1 year of age. Level of Evidence: Level III—retrospective study.

1 February 2025 in The Bone & Joint Journal
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Journal Article
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WTWesley W. E. S. Theunissen
Wesley W. E. S. Theunissen
MSMaria Christine van der Steen
Maria Christine van der Steen
TKThom Klerkx
Thom Klerkx
CSCharlotte Schonck
Charlotte Schonck
ABArnold T. Besselaar
Arnold T. Besselaar
Jaap J. TolkJaap J. Tolk
Jaap J. Tolk
Aims: Worldwide controversy exists on the optimal treatment of stable dysplastic hips. The most common treatment options are abduction brace treatment and active surveillance. The primary aim of this study was to assess the effect of active surveillance in stable hip dysplasia, by investigating the percentage of Graf IIb stable dysplastic hips that recover spontaneously without abduction brace treatment. The second aim was to identify prognostic factors for spontaneous recovery of stable dysplastic hips.Methods: A single-centre, prospective cohort study was conducted at the Máxima Medical Center between 1 March 2019 and 1 March 2023. Infants aged three to 4.5 months at the first outpatient clinic visit, diagnosed with Graf IIb hip dysplasia, and treated with active surveillance were included. Spontaneous recovery was defined as infants who had a normalized hip on ultrasound (α-angle ≥ 60°) after six weeks of active surveillance without receiving abduction brace treatment. Baseline infant characteristics and ultrasound measurements were used as potential predictor variables for spontaneous recovery in logistic regression analyses.Results: A total of 508 infants with Graf IIb stable dysplastic hips were included. Overall, 473 infants (93.1%) recovered spontaneously with active surveillance. Of the remaining 35 infants, 25 infants (4.9%) received six weeks and ten infants (2.0%) received 12 weeks of additional Pavlik harness treatment until hip normalization. In univariate and multivariate analyses, an impaired hip abduction was negatively associated (OR 0.43 (95% CI 0.20 to 0.93); p = 0.033) and being a firstborn child positively associated (OR 2.20 (95% CI 1.04 to 4.63); p = 0.042) with spontaneous recovery.Conclusion: The majority of Graf IIb stable dysplastic hips recover spontaneously in infants aged three to 4.5 months after six weeks of active surveillance. We recommend active surveillance with ultrasound as primary treatment for these infants. However, care must be taken with active surveillance in infants with a limited hip abduction.Cite this article: Bone Joint J 2025;107-B(2):261–267.

1 August 2025 in Bone & Joint Open
Verified
Journal Article
Open access
PDF file
JCJoanna Craven
Joanna Craven
OOOlivia O'MAlley
Olivia O'MAlley
WTWesley W. E. S. Theunissen
Wesley W. E. S. Theunissen
DPDaniel C. Perry
Daniel C. Perry
Aims: To identify the effect on the family and/or caregivers when infants undergo brace treatment for developmental dysplasia of the hip (DDH) by integrating findings from a literature review and stakeholder survey.Methods: Thematic analysis combining a comprehensive literature review and data from a UK-based online survey with international involvement. Identification of key themes related to the effect of brace treatment for DDH on the family/ caregivers.Results: The literature review identified eight relevant articles for inclusion. The online survey had 131 participants. During the thematic analysis, ten key themes emerged, highlighting substantial emotional distress among parents, issues with information provision and consistency, and practical challenges related to clothing, feeding, and sleep. Additional concerns included cleanliness, equipment, child development concerns, infant discomfort, bonding, financial impact, and disruption to daily life.Conclusion: Brace treatment for DDH has a significant impact on various aspects of family life. Identifying the specific areas of family life affected by brace treatment enables recognition of key challenges, informing the development of robust support systems, clear communication strategies, and customized informational resources. While bracing remains the cornerstone of DDH management in infants, with proven effectiveness in achieving positive clinical outcomes, substantial uncertainties persist regarding critical aspects of treatment, including determining the severity of dysplasia that warrants brace treatment, the optimal duration of treatment, and the most effective approach to brace removal. Resolving these uncertainties requires well-designed randomized controlled trials to establish clear, evidence-based guidelines. Furthermore, evaluations of brace treatments should explicitly incorporate family-centred outcomes. Developing a core outcome set focused on family-relevant measures would significantly enhance the design, comparability, and quality of future DDH research.Cite this article: Bone Jt Open 2025;6(8):851–858.