Publications by authors named "Kroon H"

Objective: To evaluate the role of three cartilage-derived biomarkers on osteoarthritis (OA): urinary C-terminal telopeptide (uCTX-II), serum cartilage oligomeric protein (sCOMP), and serum MMP degraded type II collagen (sC2M).

Subjects And Methods: Samples from 3582 individuals from the Rotterdam Study, the Genetics osteoArthritis and Progression (GARP), the Chingford Study and the TwinsUK cohort were assayed using enzyme-linked immune sorbent assays. Log10 of concentration levels were correlated with risk of hip, hand and knee OA, hip and knee OA severity and incidence, and progression of knee OA, adjusting for age, gender and body mass index (BMI).

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Background: Due to fragmented mental, somatic, and social healthcare services, it can be hard to engage into care older patients with severe mental illness (SMI). In adult mental health care, assertive community treatment (ACT) is an organizational model of care for treating patients with SMI who are difficult to engage. So far all outcome studies of assertive community treatment have been conducted in adults.

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Isolated limb infusion (ILI) was developed as a simplified and minimally invasive alternative to isolated limb perfusion (ILP) to treat unresectable limb melanoma. A number of centers around the world have reported their results using this procedure. In this study a systematic review of reported ILI experiences was undertaken.

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Objective: To describe the technique of isolated limb infusion (ILI) for regional high dose chemotherapy in patients with advanced malignancies confined to a limb, as currently practiced at Melanoma Institute Australia (MIA).

Background: ILI is progressively being used around the world but to date the reported response rates are generally lower than those reported by MIA.

Discussion: This description of the ILI protocol at MIA provides details that may allow other surgeons to improve results.

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Objective: To evaluate the association between synovitis on contrast enhanced (CE) MRI with microscopic and macroscopic features of synovial tissue inflammation.

Method: Forty-one patients (mean age 60 years, 61% women) with symptomatic radiographic knee OA were studied: twenty underwent arthroscopy (macroscopic features were scored (0-4), synovial biopsies obtained), twenty-one underwent arthroplasty (synovial tissues were collected). After haematoxylin and eosin staining, the lining cell layer, synovial stroma and inflammatory infiltrate of synovial tissues were scored (0-3).

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A key question in savanna ecology is how trees and grasses coexist under N limitation. We used N stable isotopes and N content to study N source partitioning across seasons from trees and associated grasses in a semi-arid savanna. We also used (15)N tracer additions to investigate possible redistribution of N by trees to grasses.

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Background: In active acromegaly, pathologically elevated GH and IGF-1 levels are associated with increased bone turnover and a high bone mass, the latter being sustained after normalization of GH values. In a cross-sectional study design, we have previously reported a high prevalence of vertebral fractures (VFs) of about 60% in patients with controlled acromegaly, despite normal mean bone mineral density (BMD) values. Whether these fractures occur during the active acromegaly phase or after remission is achieved is not known.

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Of the 285 species of Carnivora 71 are threatened, while many of these species fulfill important ecological roles in their ecosystems as top or meso-predators. Population transition matrices make it possible to study how age-specific survival and fecundity affect population growth, extinction risks, and responses to management strategies. Here we review 38 matrix models from 35 studies on 27 Carnivora taxa, covering 11% of the threatened Carnivora species.

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Background: Arthropathy is an invalidating complication of acromegaly, also in long-term controlled patients, and is radiographically characterized by osteophytes and preserved joint spaces. However, joint space narrowing (JSN) is observed in the minority of patients. It is unknown whether JSN is the end-stage of acromegalic arthropathy or whether this feature develops independently of acromegaly.

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This study examined the associations between substance abuse problems in severely mentally ill patients, outcome and Assertive Community Treatment (ACT) model fidelity. In a prospective longitudinal study, ACT model fidelity and patient outcomes were assessed in 20 outpatient treatment teams using the Health of the Nation Outcome Scales, Camberwell Assessment of Needs short appraisal schedule and measures of service use. Five hundred and thirty severely mentally ill patients participated in the study.

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Objective: To compare the care needs and severity of psychosocial problems in older patients with severe mental illness (SMI) between those who were and were not motivated for treatment.

Methods: Cross-sectional study in which we enrolled 141 outpatients with SMI aged 55 and older. Needs were measured using the Camberwell Assessment of Needs for the Elderly, and psychosocial problems with the Health of the Nation Outcome Scale 65+.

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Background: Several studies suggest a role of the growth hormone (GH)/insulin-like growth factor-1 (IGF-1) axis in the pathophysiology of primary osteoarthritis (OA). A common polymorphism of the GH receptor (exon 3 deletion, d3-GHR) is associated with increased GH/IGF-1 activity.

Objective: To study associations between the d3-GHR polymorphism and symptomatic OA.

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Background: As many patients with severe mental illness (SMI) who have complex needs are difficult to engage, outreach mental health services are needed to engage them into treatment. The extent to which these services exist in large European cities is unknown.

Methods: Experts in 29 European countries were sent a structured questionnaire containing two case vignettes of difficult-to-engage patients (a first-episode psychosis patient and a homeless chronic schizophrenia patient).

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Introduction: Although Total Hip and Knee Replacements (THR/TKR) improve Health-Related Quality of Life (HRQoL) at the group level, up to 30% of patients are dissatisfied after surgery due to unfulfilled expectations. We aimed to assess whether the pre-operative radiographic severity of osteoarthritis (OA) is related to the improvement in HRQoL after THR or TKR, both at the population and individual level.

Methods: In this multi-center observational cohort study, HRQoL of OA patients requiring THR or TKR was measured 2 weeks before surgery and at 2-5 years follow-up, using the Short-Form 36 (SF36).

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Objective: To assess whether early swelling and tenderness in large joints in patients with rheumatoid arthritis (RA) is predictive of later local damage and whether this leads to functional disability.

Methods: Two-year clinical and 8-year radiological followup data from the BeSt study (trial numbers NTR262 and NTR265), a randomized controlled treat-to-target trial, were used. The association between early local joint swelling and/or tenderness (at least once, or for ≥ 2 consecutive visits) and later large-joint damage (Larsen score ≥ 1) was assessed using generalized estimating equations.

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Background: Theory predicts that plant species win competition for a shared resource by more quickly preempting the resource in hotspots and by depleting resource levels to lower concentrations than its competitors. Competition in natural grasslands largely occurs belowground, but information regarding root interactions is limited, as molecular methods quantifying species abundance belowground have only recently become available.

Principal Findings: In monoculture, the grass Festuca rubra had higher root densities and a faster rate of soil nitrate depletion than Plantago lanceolata, projecting the first as a better competitor for nutrients.

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Arthropathy is an invalidating complication of acromegaly. This arthropathy deteriorates radiographically despite long-term disease control. However, the clinical course and its relationship to the radiographic course are currently unknown.

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The subject of the study is to investigate whether health-related quality of life (HRQoL), pain and function of patients with hip or knee osteoarthritis (OA) improves after a specialist care intervention coordinated by a physical therapist and a nurse practitioner (NP) and to assess satisfaction with this care at 12 weeks. This observational study included all consecutive patients with hip or knee OA referred to an outpatient orthopaedics clinic. The intervention consisted of a single, standardized visit (assessment and individually tailored management advice, to be executed in primary care) and a telephone follow-up, coordinated by a physical therapist and a NP, in cooperation with an orthopaedic surgeon.

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Osteosarcomas of hands or feet are rare, and seemingly these cases differ in presentation and behavior compared to those in usual locations. The clinico-pathological presentation of patients with osteosarcomas of the hand or foot was studied and compared with published cases. Forty osteosarcomas were identified among 4,221 cases, representing 0.

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Recent evidence suggests that soil nutrient heterogeneity, a ubiquitous feature of terrestrial ecosystems, modulates plant responses to ongoing global change (GC). However, we know little about the overall trends of such responses, the GC drivers involved, and the plant attributes affected.We synthesized literature to answer the question: Does soil heterogeneity significantly affect plant responses to main GC drivers, such as elevated atmospheric carbon dioxide concentration (CO), nitrogen (N) enrichment and changes in rainfall regime?Overall, most studies have addressed short-term effects of N enrichment on the performance of model plant communities using experiments conducted under controlled conditions.

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A 66-year-old man was referred to the hospital with progressive neck and right shoulder pain. Conventional radiographs and a thoracic CT-scan demonstrated destruction of the first rib on the right side due to a tumour invading the apical chest wall. The patient was diagnosed with a Pancoast tumour (i.

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Malignant fibrous histiocytoma (MFH) and fibrosarcoma (FS) of bone are rare malignant tumours and contentious entities. Sixty seven cases labelled as bone MFH (57) and bone FS (10) were retrieved from five bone tumour referral centres and reviewed to determine whether recent advances allowed for reclassification and identification of histological subgroups with distinct clinical behaviour. A panel of immunostains was applied: smooth muscle actin, desmin, h-caldesmon, cytokeratin AE1-AE3, CD31, CD34, CD68, CD163, CD45, S100 and epithelial membrane antigen.

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Objective: To determine the prevalence of large-joint damage and the association with small-joint damage in patients with RA after 8 years of low DAS (≤2.4)-targeted treatment with different treatment strategies.

Methods: Radiological data of 290 patients participating in the BeSt study, a randomized trial comparing initial monotherapy and initial combination therapy strategies, were used.

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Postoperative ileus is a commonly occurring complication after abdominal surgery. Reduced well-being and ileus related complications lead to extension of hospital stay. An early commencement of postoperative feeding to stimulate the digestive system is not always achievable in practice.

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