Rolf M. Bloem
Erasmus University Rotterdam
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Featured researches published by Rolf M. Bloem.
Geriatrics & Gerontology International | 2013
Anne J. H. Vochteloo; Sophie Moerman; Wim E. Tuinebreijer; Andrea B. Maier; Mark R. de Vries; Rolf M. Bloem; Rob G. H. H. Nelissen; Peter Pilot
Aim:u2003 To measure functional recovery and determine risk factors for failure to return to the prefracture level of mobility of hip fracture patients 1u2003year postoperatively.
BMC Musculoskeletal Disorders | 2010
Michiel Siebelt; Teun Siebelt; Peter Pilot; Rolf M. Bloem; Mohit Bhandari; Rudolf W. Poolman
BackgroundOne of the disadvantages of the Impact Factor (IF) is self-citation. The SCImago Journal Rank (SJR) indicator excludes self-citations and considers the quality, rather than absolute numbers, of citations of a journal by other journals. The present study re-evaluated the influence of self-citation on the 2007 IF for 18 major orthopaedic journals and investigated the difference in ranking between IF and SJR.MethodsThe journals were analysed for self-citation both overall and divided into a general group (n = 8) and a specialized group (n = 10). Self-cited and self-citing rates, as well as citation densities and IFs corrected for self-citation (cIF), were calculated. The rankings of the 18 journals by IF and by SJR were compared and the absolute difference between these rankings (ΔR) was determined.ResultsSpecialized journals had higher self-citing rates (p = 0.01, Δmedian = 9.50, 95%CI -19.42 to 0.42), higher self-cited rates (p = 0.0004, Δmedian = -10.50, 95%CI -15.28 to -5.72) and greater differences between IF and cIF (p = 0.003, Δmedian = 3.50, 95%CI -6.1 to 13.1). There was no significant correlation between self-citing rate and IF for both groups (general: r = 0.46, p = 0.27; specialized: r = 0.21, p = 0.56). When the difference in ranking between IF and SJR was compared between both groups, sub-specialist journals were ranked lower compared to their general counterparts (ΔR: p = 0.006, Δmedian = 2.0, 95%CI -0.39 to 4.39).ConclusionsCitation analysis shows that specialized orthopaedic journals have specific self-citation tendencies. The correlation between self-cited rate and IF in our sample was large but, due to small sample size, not significant. The SJR excludes self-citations in its calculation and therefore enhances the underestimation in ranking of specialized journals.
International Orthopaedics | 2012
A.J.H. Vochteloo; Wim E. Tuinebreijer; Andrea B. Maier; R. G. H. H. Nelissen; Rolf M. Bloem; Peter Pilot
PurposeThis paper reports on the development and validity of a new instrument, called the discharge of hip fracture patients score (DHP), that predicts at admission the discharge location in patients living in their own home prior to hip fracture surgery.MethodsA total of 310 patients aged 50xa0years and above were included. Risk factors for discharge to an alternative location (DAL) were analysed with a multivariable regression analysis taking the admission variables into account with different weights based on the estimates. The score ranged from 0–100 points. The cut-off point for DAL was calculated using a ROC analysis. Reliability of the DHP was evaluated.ResultsRisk factors for DAL were higher age, female gender, dementia, absence of a partner and a limited level of mobility. The cut-off point was set at 30 points, with a sensitivity of 83.8%, a specificity of 64.7% and positive predictive value of 79.2%.ConclusionThe DHP is a valid, simple and short instrument to be used at admission to predict discharge location of hip fracture patients.
Journal of Bone and Joint Surgery-british Volume | 2013
Joost W. Colaris; Jan Hein Allema; M. Reijman; L. U. Biter; M. R. de Vries; C.P. van de Ven; Rolf M. Bloem; J.A.N. Verhaar
Forearm fractures in children have a tendency to displace in a cast leading to malunion with reduced functional and cosmetic results. In order to identify risk factors for displacement, a total of 247 conservatively treated fractures of the forearm in 246 children with a mean age of 7.3 years (sd 3.2; 0.9 to 14.9) were included in a prospective multicentre study. Multivariate logistic regression analyses were performed to assess risk factors for displacement of reduced or non-reduced fractures in the cast. Displacement occurred in 73 patients (29.6%), of which 65 (89.0%) were in above-elbow casts. The mean time between the injury and displacement was 22.7 days (0 to 59). The independent factors found to significantly increase the risk of displacement were a fracture of the non-dominant arm (p = 0.024), a complete fracture (p = 0.040), a fracture with translation of the ulna on lateral radiographs (p = 0.014) and shortening of the fracture (p = 0.019). Fractures of both forearm bones in children have a strong tendency to displace even in an above-elbow cast. Severe fractures of the non-dominant arm are at highest risk for displacement. Radiographs at set times during treatment might identify early displacement, which should be treated before malunion occurs, especially in older children with less potential for remodelling.
Journal of Medical Case Reports | 2011
Peter R. Krekel; Anne J. H. Vochteloo; Rolf M. Bloem; Rob G. H. H. Nelissen
IntroductionFemoroacetabular impingement leads to limited hip motion, pain and progressive damage to the labrum. Assessment of the amount and location of excessive ossification can be difficult, and removal does not always lead to pain relief and an increase of function. One of the challenges ahead is to discover why certain cases have poor outcomes.Case presentationThe technical and clinical results of two consecutive arthroscopic shavings of an osseous cam protrusion are described in our patient, a 50-year-old Caucasian man with complaints of femoroacetabular impingement. At 12 weeks after the first arthroscopic shaving, our patient still experienced pain. Using a range of motion simulation system based on computed tomography images the kinematics of his hip joint were analyzed. Bone that limited range of motion was removed in a second arthroscopic procedure. At six months post-operatively our patient is almost pain free and has regained a range of motion to a functional level.ConclusionThis case demonstrates the relevance of range of motion simulation when the outcome of primary arthroscopic management is unsatisfactory. Such simulations may aid clinicians in determining the gain of a second operation. This claim is supported by the correlation of the simulations with clinical outcome, as shown in this case report.
Geriatrics & Gerontology International | 2013
Anne J. H. Vochteloo; Boudewijn Ls Borger van der Burg; Wim E. Tuinebreijer; Mark R. de Vries; Arthur H.P. Niggebrugge; Rolf M. Bloem; Andrea B. Maier; Rob G. H. H. Nelissen; Peter Pilot
Aim:u2003 To compare clinical characteristics and outcome of nonagenarian hip fracture patients with younger patients aged 65–89u2003years.
Injury-international Journal of The Care of The Injured | 2014
Joost W. Colaris; M. Reijman; Jan Hein Allema; Mark R. de Vries; L. Ulas Biter; Rolf M. Bloem; Cees P. van de Ven; J.A.N. Verhaar
INTRODUCTIONnAlthough limitation of pronation/supination following both-bone forearm fractures in children is often attributed to an angular malunion, no clinical study has compared pronation/supination and angular malalignment of the same child by analysis of prospectively collected clinical data.nnnAIMnThe purpose of this trial is to explore whether limitation of pronation/supination can be predicted by the degree of angular malalignment in children who sustained a both-bone forearm fracture.nnnMETHODSnIn four Dutch hospitals, children aged ≤16 years with a both-bone forearm fracture were prospectively followed up consecutive children for 6-9 months. At the final follow-up, pronation/supination and angular malunion on radiographs were determined.nnnRESULTSnBetween January 2006 and August 2010, a total of 410 children were prospectively followed up, of which 393 children were included for analysis in this study. The mean age of the children was 8.0 (±3.5) years, of which 63% were male and 40% fractured their dominant arm. The mean time to final examination was 219 (±51) days. Children with a metaphyseal both-bone fracture of the distal forearm with an angular malalignment of ≤15° had a 9-13% chance of developing a clinically relevant limitation (i.e., <50° of pronation and/or supination), while children with an angular malalignment of ≥16° had a 60% chance. Children with diaphyseal both-bone forearm fractures with ≤5° of angular malalignment had a 13% chance of developing a clinically relevant limitation, which showed no significant increase with a further increase of angular malalignment.nnnCONCLUSIONSnChildren who sustained a both-bone forearm fracture localised in the distal metaphysis have a higher chance of developing a clinically relevant limitation of forearm rotation in case of a more severe angular malalignment, while children with a diaphyseal both-bone forearm fracture had a moderate chance of limitation, irrespective of the severity of the angular malalignment.
International Orthopaedics | 2013
Anne J. H. Vochteloo; Elvira R. Flikweert; Wim E. Tuinebreijer; Andrea B. Maier; Rolf M. Bloem; Peter Pilot; Rob G. H. H. Nelissen
PurposeThis paper reports the external validation of a recently developed instrument, the Discharge of Hip fracture Patients score (DHP) that predicts discharge location on admission in patients living in their own home prior to hip fracture surgery.MethodsThe DHP (maximum score 100 points) was applied to 125 hip fracture patients aged 50xa0or more years admitted to an academic centre in the northern part of the Netherlands (Groningen cohort). The characteristics of this cohort, sensitivity, specificity and positive and negative predictive value (PPV, NPV) of the DHP for discharge to an alternative location (DAL) were calculated and compared with the original cohort of hip fracture patients from the western part of the Netherlands (Delft cohort). Scoring 30 points or higher indicated DAL.ResultsThe Groningen cohort was younger compared to the Delft cohort, (mean age 75.4 vs. 78.5xa0years, Pu2009=u20090.005) but was more often classified ASA III/IV (46.4xa0% vs. 25.2xa0%, Pu2009<u20090.001). Sensitivity of the DHP for DAL in the Groningen cohort was 75xa0% (vs. 83.8xa0%), specificity of 66.7xa0% (vs. 64.7xa0%) and a PPV of 86.3xa0% (vs. 79.2xa0%), compared to the Delft cohort.ConclusionExternal validation of the DHP was successful; it predicted discharge location of hip fracture patients accurately in another Dutch cohort, the sensitivity for DAL was somewhat lower but the PPV higher. Therefore, the DHP score is a useful valid and easily applied instrument for general hip fracture populations.
Huisarts En Wetenschap | 2009
Peter Pilot; Stephan Vehmeijer; Hennie Verburg; Dick Cornelisse; Rolf M. Bloem
SamenvattingPilot P, Vehmeijer SBW, Verburg H, Cornelisse HB, Bloem RM, Stand van zaken rond de totale heup- en knieartroplastiek. Huisarts Wet 2009;52(11):542-6.De totale heupoperatie en de knievervangende operatie zijn zeer succesvolle ingrepen, gelet op de verbetering van de kwaliteit van leven. Voor de levensduur van zowel een heup als een knie mag minimaal tien jaar aangehouden worden. Een korte opnameduur van drie tot zeven dagen is momenteel standaard. Verdere doorvoering van multi modale anesthesie- en analgesietechnieken lijkt de belangrijkste stap om in de komende jaren een verdere kwaliteitsverbetering en verkorting van de opnameduur te bereiken. Daarnaast is er veel ontwikkeling in de ontwerpen en materialen van de protheses, waardoor de protheses steeds langer meegaan en een steeds hogere belasting aankunnen.
Archive | 2004
Stephan Vehmeijer; Rolf M. Bloem