T M van Raaij

Erasmus Universiteit Rotterdam, Rotterdam, South Holland, Netherlands

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Publications (6)16.21 Total impact

  • Osteoarthritis and Cartilage 09/2009; 17. · 4.26 Impact Factor
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    ABSTRACT: We have analysed retrospectively the influence of different sources of knee deformity on failure of closing wedge high tibial valgus osteotomy (HTO). Preoperative frontal plane varus deformities of the lower extremity, distal femur and proximal tibia, and medial convergence of the knee joint line were assessed on a standard whole leg radiograph in 76 patients. Using the logistic regression model, the probability of survival for HTO was 77% (SD 4%) at 10-years follow-up. Varus deformity of the lower extremity (< 175 degrees ), and medial convergence of the knee joint line (> 3 degrees ) were identified as preoperative risk factors for conversion to arthroplasty (P = 0.03 and P = 0.006). We found no evidence that varus inclination of the proximal tibia or distal femur influences long-term survival of HTO.
    Knee Surgery Sports Traumatology Arthroscopy 01/2009; 17(4):390-5. · 2.68 Impact Factor
  • Gait & Posture - GAIT POSTURE. 01/2008; 28.
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    ABSTRACT: A prospective, randomised, controlled trial compared two different techniques of high tibial osteotomy with a lateral closing wedge or a medial opening wedge, stabilised by a Puddu plate. The clinical outcome and radiological results were examined at one year. The primary outcome measure was the achievement of an overcorrection of valgus of 4 degrees . Secondary outcome measures were the severity of pain (visual analogue scale), knee function (Hospital for Special Surgery score), and walking distance. Between January 2001 and April 2004, 92 patients were randomised to one or other of the techniques. At follow-up at one year the post-operative hip-knee-ankle angle was 3.4 degrees (+/- 3.6 degrees SD) valgus after a closing wedge and 1.3 degrees (+/- 4.7 degrees SD) of valgus after an opening wedge. The adjusted mean difference of 2.1 degrees was significant (p = 0.02). The deviation from 4 degrees of valgus alignment was 2.7 degrees (+/- 2.4 degrees SD) in the closing wedge and 4.0 degrees (+/- 3.6 degrees sd) in the opening-wedge groups. The adjusted mean difference of 1.67 degrees was also significant (p = 0.01). The severity of pain, knee score and walking ability improved in both groups, but the difference was not significant. Because of pain, the staples required removal in 11 (23%) patients in the closing-wedge group and a Puddu plate was removed in 27 (60%) patients in the opening-wedge group. This difference was significant (p < 0.001). We conclude that closing-wedge osteotomy achieves a more accurate correction with less morbidity, although both techniques had improved the function of the knee at one year after the procedure.
    Journal of Bone and Joint Surgery - British Volume 11/2006; 88(11):1454-9. · 2.69 Impact Factor
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    T M van Raaij, J de Waal Malefijt
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    ABSTRACT: We analysed 20 patients with 24 knees affected by idiopathic genu recurvatum who were treated with an anterior opening wedge osteotomy of the proximal tibia because of anterior knee pain. We managed to attain full satisfaction in 83% of the patients with a mean follow-up of 7.4 years. The mean Hospital for Special Surgery score was 90.3 (range 70.5-99.5), and the mean Knee Society score score was 94.6 (70-100) for function and 87.7 (47-100) for pain. The mean Western Ontario and McMaster University Osteoarthritis Index score for knee function was 87.5 (42-100), for stiffness 82.8 (25-100) and for pain 87.3 (55-100). Radiographs showed a significant increase in posterior tibial slope of 9.4 deg and a significant decrease of patellar height according to the Blackburne-Peel method of 0.16 postoperatively. No cases of non-union, deep infection or compartment syndrome were seen. No osteoarthritic changes in the lateral or medial knee compartment were found with more than 5 years' follow-up in 16 patients with 19 affected knees. Three out of the four dissatisfied patients had a patella infera which led to patellofemoral complaints. One patient in the study underwent a secondary superior displacement of the patella with excellent results. We conclude that in a selected group of patients with idiopathic genu recurvatum and anterior knee pain an opening wedge osteotomy of the proximal tibia can be beneficial.
    International Orthopaedics 09/2006; 30(4):248-52. · 2.32 Impact Factor
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    ABSTRACT: To evaluate the effect of a brace intended to reduce load in patients with medial or lateral compartmental osteoarthritis (OA) and concurrent varus or valgus alignment, respectively. This multi-centre randomized controlled trial (performed 2001-2003) studies the additive effect of a brace intended to reduce load in conservative treatment of unicompartmental OA of the knee. Setting: Orthopedic department of a university medical centre and of one general hospital. The follow-up was 12 months. Patients: 117 patients with unicompartmental OA of the knee. Intervention group (n=60) comprising conservative treatment with additional brace treatment and a control group (n=57) comprising conservative treatment alone. Primary outcome measures: Pain severity and knee function score. Secondary outcome measures: Walking distance and quality of life. Analysis: Multiple linear regression models according to the intention-to-treat-principle were used to assess outcome differences for the entire group of patients. In addition, we performed explorative subgroup analyses on primary overall outcomes stratified for alignment, degree of OA, origin of OA, and age. Although the primary outcome measures were improved in the intervention group in comparison with the controls at each assessment point, the differences reached only borderline significance. The reported walking distances at 3 months, 12 months and overall were significantly longer in the brace group (P=0.03, P=0.04 and P=0.02, respectively). Subgroup analysis showed a better effect in the varus group, in patients with severe OA, in patients with secondary OA and in patients younger then 60 years. In total 25 patients in the brace group and 14 in the control group changed their initial treatment, mostly (74%) because of a lack of beneficial effect. The results indicate that a brace intended to reduce load shows small effects in patients with unicompartmental OA. However, many patients do not adhere in the long run to this kind of conservative treatment.
    Osteoarthritis and Cartilage 09/2006; 14(8):777-83. · 4.26 Impact Factor

Publication Stats

113 Citations
16.21 Total Impact Points

Institutions

  • 2009
    • Erasmus Universiteit Rotterdam
      • Department of Orthopaedics
      Rotterdam, South Holland, Netherlands
  • 2006
    • St. Elisabeth Ziekenhuis Tilburg
      Tilburg, North Brabant, Netherlands