E R Valstar

Summary

Affiliation: Leiden University Medical Center
Country: The Netherlands

Publications

  1. ncbi Kinematics of a highly congruent mobile-bearing total knee prosthesis
    N Wolterbeek
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Postbus 9600, J11 S, 2300 RC Leiden, The Netherlands
    Knee Surg Sports Traumatol Arthrosc 20:2487-93. 2012
  2. ncbi Measuring femoral lesions despite CT metal artefacts: a cadaveric study
    Daniel F Malan
    Department of Orthopaedics, Leiden University Medical Center, J11 R Albinusdreef 2, 2333ZA Leiden, The Netherlands
    Skeletal Radiol 41:547-55. 2012
  3. ncbi AQUILA: assessment of quality in lower limb arthroplasty. An expert Delphi consensus for total knee and total hip arthroplasty
    Bart G Pijls
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands, Albinusdreef 2, Leiden, The Netherlands
    BMC Musculoskelet Disord 12:173. 2011
  4. ncbi Guidelines for standardization of radiostereometry (RSA) of implants
    Edward R Valstar
    Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    Acta Orthop 76:563-72. 2005
  5. ncbi Micromotion of the Souter-Strathclyde total elbow prosthesis in patients with rheumatoid arthritis 21 elbows followed for 2 years
    Edward R Valstar
    Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    Acta Orthop Scand 73:264-72. 2002
  6. ncbi Model-based Roentgen stereophotogrammetry of orthopaedic implants
    E R Valstar
    Department of Orthopaedics, Leiden University Medical Center, P O Box 9600, 2300 RC Leiden, The Netherlands
    J Biomech 34:715-22. 2001
  7. ncbi Digital automated RSA compared to manually operated RSA
    E R Valstar
    Department of Orthopaedics, Leiden University Medical Center, P O Box 9600, 2300 RC, Leiden, Netherlands
    J Biomech 33:1593-9. 2000
  8. ncbi Cyclic loading of fractured cadaveric femurs after elastomer femoroplasty: an in vitro biomechanical study
    T J van der Steenhoven
    Leiden University Medical Center, Department of Surgery, Leiden, The Netherlands
    Clin Biomech (Bristol, Avon) 27:819-23. 2012
  9. ncbi Fast and accurate automated measurements in digitized stereophotogrammetric radiographs
    H A Vrooman
    Department of Radiology, Leiden University Medical Center, The Netherlands
    J Biomech 31:491-8. 1998
  10. ncbi Handling modular hip implants in model-based RSA: combined stem-head models
    A H Prins
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
    J Biomech 41:2912-7. 2008

Collaborators

Detail Information

Publications57

  1. ncbi Kinematics of a highly congruent mobile-bearing total knee prosthesis
    N Wolterbeek
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Postbus 9600, J11 S, 2300 RC Leiden, The Netherlands
    Knee Surg Sports Traumatol Arthrosc 20:2487-93. 2012
    ..The aim of this study was to assess knee kinematics and muscle activation and their possible change over time in patients with a highly congruent, mobile-bearing total knee prosthesis...
  2. ncbi Measuring femoral lesions despite CT metal artefacts: a cadaveric study
    Daniel F Malan
    Department of Orthopaedics, Leiden University Medical Center, J11 R Albinusdreef 2, 2333ZA Leiden, The Netherlands
    Skeletal Radiol 41:547-55. 2012
    ..We investigated to what extent metal artefacts interfere with the segmentation of lesions adjacent to a metal femoral implant and whether metal artefact reduction improves the manual segmentation of such lesions...
  3. ncbi AQUILA: assessment of quality in lower limb arthroplasty. An expert Delphi consensus for total knee and total hip arthroplasty
    Bart G Pijls
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands, Albinusdreef 2, Leiden, The Netherlands
    BMC Musculoskelet Disord 12:173. 2011
    ..A Delphi approach was used to develop a checklist for reporting quality, methodological quality and generalizability of case series and cohorts in total hip and total knee arthroplasty with a focus on aseptic loosening...
  4. ncbi Guidelines for standardization of radiostereometry (RSA) of implants
    Edward R Valstar
    Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    Acta Orthop 76:563-72. 2005
    ..Such a protocol-also including other recognized clinical outcome parameters-will reduce the risk of implanting potentially inferior prostheses on a large scale...
  5. ncbi Micromotion of the Souter-Strathclyde total elbow prosthesis in patients with rheumatoid arthritis 21 elbows followed for 2 years
    Edward R Valstar
    Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    Acta Orthop Scand 73:264-72. 2002
    ..The effect of this change in design on micromotion of the Souter-Strathclyde total elbow prosthesis will be studied in a randomized RSA study comparing the new design to the existing one...
  6. ncbi Model-based Roentgen stereophotogrammetry of orthopaedic implants
    E R Valstar
    Department of Orthopaedics, Leiden University Medical Center, P O Box 9600, 2300 RC Leiden, The Netherlands
    J Biomech 34:715-22. 2001
    ..Research is now being conducted to make model-based RSA less sensitive to dimensional tolerances and thereby improving its accuracy...
  7. ncbi Digital automated RSA compared to manually operated RSA
    E R Valstar
    Department of Orthopaedics, Leiden University Medical Center, P O Box 9600, 2300 RC, Leiden, Netherlands
    J Biomech 33:1593-9. 2000
    ..We conclude that digital RSA is an accurate, fast, and user friendly alternative for manually operated RSA. Currently, digital RSA systems are being used in a growing number of clinical RSA-studies...
  8. ncbi Cyclic loading of fractured cadaveric femurs after elastomer femoroplasty: an in vitro biomechanical study
    T J van der Steenhoven
    Leiden University Medical Center, Department of Surgery, Leiden, The Netherlands
    Clin Biomech (Bristol, Avon) 27:819-23. 2012
    ..The aim of the present study was to establish the failure loads and inter-fragmentary movement of fractured, elastomer femoroplasty treated femurs during cyclic loading...
  9. ncbi Fast and accurate automated measurements in digitized stereophotogrammetric radiographs
    H A Vrooman
    Department of Radiology, Leiden University Medical Center, The Netherlands
    J Biomech 31:491-8. 1998
    ..This new technique will be used in our clinic for our hip, knee, and elbow studies...
  10. ncbi Handling modular hip implants in model-based RSA: combined stem-head models
    A H Prins
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
    J Biomech 41:2912-7. 2008
    ..01) on the clinical data. With relatively small differences in the other migration directions, these results demonstrate that the new method with a combined stem-head model can be a useful alternative to the standard model-based approach...
  11. ncbi Detecting femur-insert collisions to improve precision of fluoroscopic knee arthroplasty analysis
    A H Prins
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    J Biomech 43:694-700. 2010
    ..In conclusion, collision detection can prevent reconstructing impossible poses and it improves the position and motion estimation in the out-of-plane direction...
  12. ncbi Evaluation of three pose estimation algorithms for model-based roentgen stereophotogrammetric analysis
    B L Kaptein
    Department of Orthopaedics, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands
    Proc Inst Mech Eng H 218:231-8. 2004
    ..The IIPM and DIF algorithms are robust to the different distortions, making model-based RSA a possible replacement for marker-based RSA...
  13. ncbi Limited rotation of the mobile-bearing in a rotating platform total knee prosthesis
    E H Garling
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands Department of Radiology, Division of Image Processing, Leiden University Medical Center, Leiden, The Netherlands
    J Biomech 40:S25-30. 2007
    ....
  14. ncbi A model-based approach to measure the minimum joint space width of total knee replacements in standard radiographs
    E A van Ijsseldijk
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    J Biomech 45:2171-5. 2012
    ..Although the use of a phantom experiment poses some limitations in conveying the findings to clinical practice, this improved mJSW measurement can lead to better wear detection for surgery decisions and research purposes...
  15. ncbi Migration of the humeral component of the Souter-Strathclyde elbow prosthesis: a long-term RSA study
    J C T van der Lugt
    Department of Orthopaedics, Leiden University Medical Centre, 2300 RC, Leiden, The Netherlands
    J Bone Joint Surg Br 92:235-41. 2010
    ..8 mm (sd 1.0) and in the non-revised 0.7 mm (sd 0.5, p = 0.01). Most humeral components migrated into external rotation resulting in an anterior and varus tilt. The ulnar components remained stable...
  16. ncbi Evaluation of bone impingement prediction in pre-operative planning for shoulder arthroplasty
    P R Krekel
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
    Proc Inst Mech Eng H 223:813-22. 2009
    ..20 degrees (from -3.40 degrees to 1.80 degrees). It was concluded that the ROM simulator is sufficiently accurate to fulfil its role as a supportive instrument for orthopaedic surgeons during shoulder replacement surgery...
  17. ncbi Image-based RSA: Roentgen stereophotogrammetric analysis based on 2D-3D image registration
    P W de Bruin
    Orthopaedics Department, Leiden University Medical Center, Leiden, The Netherlands
    J Biomech 41:155-64. 2008
    ....
  18. ncbi Integrated contour detection and pose estimation for fluoroscopic analysis of knee implants
    A H Prins
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
    Proc Inst Mech Eng H 225:753-61. 2011
    ..It eliminates most of the manual work in fluoroscopic analysis, with sufficient precision for clinical research purposes...
  19. ncbi A new type of model-based Roentgen stereophotogrammetric analysis for solving the occluded marker problem
    B L Kaptein
    Department of Orthopaedics, Leiden University Medical Center, P O Box 9600, 2300 RC Leiden, The Netherlands
    J Biomech 38:2330-4. 2005
    ..The new algorithm makes RSA more robust for occlusion of markers. This improves the results of clinical RSA studies because the number of lost RSA follow-up moments is reduced...
  20. ncbi A new model-based RSA method validated using CAD models and models from reversed engineering
    B L Kaptein
    Department of Orthopaedics, Leiden University Medical Center, P O Box 9600 RC, Leiden 2300, The Netherlands
    J Biomech 36:873-82. 2003
    ..05 degrees. Studies with clinical RSA-radiographs must prove that these results can also be reached in a clinical setting, making model-based RSA a possible alternative for marker-based RSA...
  21. ncbi Mobile bearing knee kinematics change over time. A fluoroscopic study in rheumatoid arthritis patients
    N Wolterbeek
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
    Clin Biomech (Bristol, Avon) 24:441-5. 2009
    ..While the effect of the conformity on the axial rotation will not change over time, the effect of impingement and fibrous tissue is likely to increase, and thereby further decreasing the axial rotation...
  22. ncbi Kinematics and early migration in single-radius mobile- and fixed-bearing total knee prostheses
    N Wolterbeek
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
    Clin Biomech (Bristol, Avon) 27:398-402. 2012
    ..The aim of this study was to evaluate early migration of the tibial component and kinematics of a mobile-bearing and fixed-bearing total knee prosthesis of the same single-radius design...
  23. ncbi Influence of the positioning of a cementless glenoid prosthesis on its interface micromotions
    D R Suárez
    Department of Orthopaedics, Leiden University Medical Centre, Leiden, The Netherlands
    Proc Inst Mech Eng H 223:795-804. 2009
    ..However, when the implantation depth was 3 mm deeper, anterior and inferior inclinations were more favourable than a neutral alignment and other inclinations. Micromotions in RA bone were always larger than in healthy bone...
  24. ncbi No differences in in vivo kinematics between six different types of knee prostheses
    N Wolterbeek
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, PO Box 9600, J11 S, 2300 RC, Leiden, The Netherlands
    Knee Surg Sports Traumatol Arthrosc 20:559-64. 2012
    ..The hypothesis was that there are no clear recognizable differences in in vivo kinematics between different design parameters or prostheses...
  25. ncbi The Femoral Epicondylar Frame to track femoral rotation in optoelectronic gait analysis
    A W Zürcher
    Department of Orthopaedics, Diakonessen Hospital, Utrecht, The Netherlands
    Gait Posture 33:306-8. 2011
    ..3° on average, with an absolute extreme of 6.2°. It is concluded that the accuracy of the FEF is sufficient to evaluate axial knee rotation with optoelectronic gait analysis at group level in clinical studies...
  26. ncbi Elastomer femoroplasty prevents hip fracture displacement In vitro biomechanical study comparing two minimal invasive femoroplasty techniques
    T J van der Steenhoven
    Leiden University Medical Center, Department of Orthopaedics, Leiden, The Netherlands
    Clin Biomech (Bristol, Avon) 26:464-9. 2011
    ..The purpose of this study was to test femur strength and the ability to prevent fracture displacement of two minimal invasive Elastomer femoroplasty techniques...
  27. ncbi The robustness and accuracy of in vivo linear wear measurements for knee prostheses based on model-based RSA
    E A van Ijsseldijk
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands
    J Biomech 44:2724-7. 2011
    ..The measurement is robust in clinical settings. Although anterior tilt seems to influence the measurement, the size of this influence is low and clinically irrelevant...
  28. ncbi Soft-tissue artefact assessment during step-up using fluoroscopy and skin-mounted markers
    E H Garling
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands Department of Radiology, Division of Image Processing, Leiden University Medical Center, Leiden, The Netherlands
    J Biomech 40:S18-24. 2007
    ....
  29. ncbi Roentgen stereophotogrammetric analysis of metal-backed hemispherical cups without attached markers
    E R Valstar
    Department of Orthopaedics, Leiden University Medical Centre, The Netherlands
    J Orthop Res 15:869-73. 1997
    ..39 degree. These results show that the new method, in which the position and orientation of metal-backed hemispherical cup is calculated from its projected contours, is a simple and accurate alternative to attaching markers to the cup...
  30. ncbi Differences in long-term fixation between mobile-bearing and fixed-bearing knee prostheses at ten to 12 years' follow-up: a single-blinded randomised controlled radiostereometric trial
    B G Pijls
    Leiden University Medical Center, Department of Orthopaedics, P O Box 9600, Postzone J 11 S 2300 RC Leiden, The Netherlands
    J Bone Joint Surg Br 94:1366-71. 2012
    ..The wear underneath the mobile bearing was small and is unlikely to be clinically relevant...
  31. ncbi On stabilization of loosened hip stems via cement injection into osteolytic cavities
    A Andreykiv
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands
    Clin Biomech (Bristol, Avon) 27:807-12. 2012
    ..Preliminary clinical results show the improvement in walking distance, patients' independence and pain relief...
  32. ncbi Validation of the in vivo volumetric wear measurement for total knee prostheses in model-based RSA
    E A van Ijsseldijk
    Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, The Netherlands Electronic address
    J Biomech 46:1387-91. 2013
    ..This is an important limitation to the applicability of the volumetric wear measurement in clinical practice and further clinical validation is required...
  33. ncbi Patterns of loosening of the glenoid component
    J Nagels
    Department of Orthopaedics, Leiden University Medical Centre, The Netherlands
    J Bone Joint Surg Br 84:83-7. 2002
    ..In only one, with gross loosening, were the radiological signs consistent with the RSA findings. When traditional radiographs are used for assessment, the rate of early loosening is underestimated. We recommend that RSA be used for this...
  34. ncbi Augmentation with silicone stabilizes proximal femur fractures: an in vitro biomechanical study
    T J van der Steenhoven
    Leiden University Medical Center, Department of Surgery, Leiden, The Netherlands
    Clin Biomech (Bristol, Avon) 24:286-90. 2009
    ..This study compared the degree of dislocation after a controlled induced fracture between treated and control cadaver femora...
  35. ncbi The proximal fixation strength of modern EVAR grafts in a short aneurysm neck. An in vitro study
    W M P F Bosman
    Department of Surgery, Section Vascular Surgery, Leiden University Medical Center, Postbox 9600, K6 R, 2300 RC Leiden, The Netherlands
    Eur J Vasc Endovasc Surg 39:187-92. 2010
    ..The study aims to measure the strength of the proximal fixation of endografts in short and long necks...
  36. ncbi Clinical validation of model-based RSA for a total knee prosthesis
    Bart L Kaptein
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
    Clin Orthop Relat Res 464:205-9. 2007
    ..LEVEL OF EVIDENCE: Level II, prognostic study. See the Guidelines for Authors for a complete description of levels of evidence...
  37. ncbi Roentgen stereophotogrammetric analysis: an accurate tool to assess stent-graft migration
    Olivier H J Koning
    Department of Surgery, Division of Vascular Surgery, Leiden University Medical Center, Leiden, The Netherlands
    J Endovasc Ther 13:468-75. 2006
    ..To evaluate in an in vitro model the feasibility and accuracy of Roentgen stereophotogrammetric analysis (RSA) versus computed tomography (CT) for the ability to detect stent-graft migration...
  38. ncbi Early migration of the tibial component of the buechel-pappas total ankle prosthesis
    Rob G H H Nelissen
    Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    Clin Orthop Relat Res 448:146-51. 2006
    ..LEVEL OF EVIDENCE: Therapeutic, Level IV. See Guidelines for Authors for a complete description of levels of evidence...
  39. ncbi Periapatite may not improve micromotion of knee prostheses in rheumatoid arthritis
    Matthys J A van der Linde
    Department of Orthopaedic Surgery and Traumatology, Atrium Medisch Centrum, Heerlen, The Netherlands
    Clin Orthop Relat Res 448:122-8. 2006
    ..LEVEL OF EVIDENCE: Therapeutic Level II. See the Guidelines for Authors for a complete description of levels of evidence...
  40. ncbi Increased muscle activity to stabilise mobile bearing knees in patients with rheumatoid arthritis
    Eric H Garling
    Department of Orthopaedics, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands
    Knee 12:177-82. 2005
    ..Rehabilitation programs for RA patients should include besides muscle strength training, elements of muscle-coordination training...
  41. ncbi Model-based RSA of a femoral hip stem using surface and geometrical shape models
    Bart L Kaptein
    Department of Orthopaedics, Leiden University Medical Center, The Netherlands
    Clin Orthop Relat Res 448:92-7. 2006
    ..We found no difference in accuracy and precision between the two model-based RSA techniques in clinical data. For this particular hip stem, EGS model-based RSA is a good alternative for marker-based RSA...
  42. ncbi Factors associated with excessive migration in bone impaction hip revision surgery: a radiostereometric analysis study
    Rob G H H Nelissen
    Department of Orthopaedic Surgery, Leiden University Medical Center, Leiden, The Netherlands
    J Arthroplasty 17:826-33. 2002
    ....
  43. ncbi Effects of ligament sectioning on the kinematics of the distal tibiofibular syndesmosis: a radiostereometric study of 10 cadaveric specimens based on presumed trauma mechanisms with suggestions for treatment
    Annechien Beumer
    Department of Orthopaedics, Erasmus University Medical Centre, Rotterdam, The Netherlands
    Acta Orthop 77:531-40. 2006
    ..Patients with acute complete ATiFL ruptures, or combined ATiFL and AD ruptures should be treated with immobilization in a plaster. Patients with combined ruptures of the ATiFL, AD and PTiFL need to be treated with a syndesmotic screw...
  44. ncbi Kinematics before and after reconstruction of the anterior syndesmosis of the ankle: A prospective radiostereometric and clinical study in 5 patients
    Annechien Beumer
    Department of Orthopaedics, Erasmus University Medical Centre, Rotterdam, The Netherlands
    Acta Orthop 76:713-20. 2005
    ....
  45. ncbi External rotation stress imaging in syndesmotic injuries of the ankle: comparison of lateral radiography and radiostereometry in a cadaveric model
    Annechien Beumer
    Department of Orthopaedics, Erasmus University Medical Center, Rotterdam, The Netherlands
    Acta Orthop Scand 74:201-5. 2003
    ..We conclude that instability of the syndesmosis in cadaveric ankles can be detected with 7.5 Nm external rotation stress RSA, but that external rotation stress lateral radiography is unreliable...
  46. ncbi Accurate detection of stent-graft migration in a pulsatile aortic model using Roentgen stereophotogrammetric analysis
    Olivier H J Koning
    Departments of Surgery Division of Vascular Surgery, Leiden University Medical Center, Leiden, The Netherlands
    J Endovasc Ther 14:30-8. 2007
    ....
  47. ncbi Co-contraction in RA patients with a mobile bearing total knee prosthesis during a step-up task
    Eric H Garling
    Department of Orthopaedics, Leiden University Medical Center, J11 S, 2300 RC Leiden, The Netherlands
    Knee Surg Sports Traumatol Arthrosc 16:734-40. 2008
    ..Rehabilitation programs for RA patients should include besides muscle strength training, elements of muscle-coordination training...
  48. ncbi Assessment of three-dimensional stent-graft dynamics by using fluoroscopic roentgenographic stereophotogrammetric analysis
    Olivier H J Koning
    Department of Surgery, Division of Vascular Surgery, Leiden University Medical Center, Leiden, The Netherlands
    J Vasc Surg 46:773-9. 2007
    ..To validate the use of fluoroscopic roentgenographic stereophotogrammetric analysis (FRSA) for its feasibility and accuracy for measuring the three-dimensional dynamic motion of stent grafts...
  49. ncbi Marker Configuration Model-Based Roentgen Fluoroscopic Analysis
    Eric H Garling
    Department of Orthopaedics, Leiden University Medical Center, P O Box 9600, J11 S, 2300 RC Leiden, The Netherlands
    J Biomech 38:893-901. 2005
    ..MCM-Based RFA has the potential to be an accurate, clinically useful tool for studying kinematics after total joint replacement using standard equipment...
  50. ncbi Kinematics of the distal tibiofibular syndesmosis: radiostereometry in 11 normal ankles
    Annechien Beumer
    Department of Orthopaedics, Erasmus University Medical Center Rotterdam, The Netherlands
    Acta Orthop Scand 74:337-43. 2003
    ..5 mm and posterior displacement between 1.0 and 3.1 mm. These data can be used as normal reference values for studies of patients with suspected syndesmotic injuries...
  51. ncbi Comparison of micromotion in mobile bearing and posterior stabilized total knee prostheses: a randomized RSA study of 40 knees followed for 2 years
    Eric H Garling
    Department of Orthopedics, Leiden University Medical Center, Leiden, The Netherlands
    Acta Orthop 76:353-61. 2005
    ..On theoretical grounds mobile bearing total knees should reduce the micromotion of the tibial component relative to the bone...
  52. ncbi Factors influencing the surgical process during shoulder joint replacement: time-action analysis of five different prostheses and three different approaches
    Joanne P J Minekus
    Delft University of Technology, Faculty of Design, Engineering and Production, Delft, The Netherlands
    Med Sci Monit 11:CR14-20. 2005
    ..Furthermore, it shows the large variation in factors affecting surgical performance, indicating that a system approach is needed to improve surgical outcome...
  53. ncbi Evaluation of humeral head replacements using time-action analysis
    Joanne P J Minekus
    Faculty of Design, Engineering and Production, Delft University of Technology, The Netherlands
    J Shoulder Elbow Surg 12:152-7. 2003
    ..Limitations of the surgical process that can be improved could be identified. These findings enable the evaluation of new operative techniques, protocols, and instruments...
  54. ncbi The history and future of radiostereometric analysis
    Johan Kärrholm
    Department of Orthopaedics, Sahlgrenska University Hospital, Goteborg, Sweden
    Clin Orthop Relat Res 448:10-21. 2006
    ..Radiostereometric analysis has helped develop new fields in clinical orthopaedic research and continues to improve advancements in orthopaedic health care...
  55. ncbi Radiostereometric analysis in orthopaedic surgery: editorial comment
    Edward R Valstar
    Clin Orthop Relat Res 448:2. 2006
  56. ncbi Transepicondylar axis accuracy in computer assisted knee surgery: a comparison of the CT-based measured axis versus the CAS-determined axis
    Henrica M J van der Linden-van der Zwaag
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
    Comput Aided Surg 13:200-6. 2008
    ..During CT-free navigation in TKA, a systematic error of 3 degrees arose when determining the TEA. It is emphasized that the intraoperative epicondylar axis is different from the actual CT-based epicondylar axis...
  57. ncbi Influence of cement viscosity and cement mantle thickness on migration of the Exeter total hip prosthesis
    Rob G H H Nelissen
    Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands
    J Arthroplasty 20:521-8. 2005
    ..Because of these findings, we suggest caution before using this new high-viscosity bone cement for fixation of acetabular components...