Roland D. Donk

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OBJECTIVE To investigate the number of subsidences of inserted cervical carbon fiber cages and to define predictive factors for subsidence. METHODS All patients treated for a cervical herniated disc and fusion with a cervical carbon fiber cage between January 2002 and December 2003 were retrospectively identified. The radiological examinations were(More)
OBJECTIVE A meta-analysis was performed to evaluate whether a beneficial clinical effect of cervical disk prostheses over conventional cervical diskectomy with fusion exists. METHODS A literature search was completed ending February 4, 2009, that included the abstract books of recent major spine congresses. All studies reported the results of single-level(More)
OBJECT The authors evaluate the effects of implantation of a carbon fiber cage after anterior cervical discectomy (ACD) on the height of the foramen and the angulation between endplates of the disc space. METHODS Thirteen consecutive patients who were scheduled for standard microscopic ACD and interbody fusion underwent thin-slice (1.5 mm) spiral(More)
BACKGROUND A medialization of the femoral component in a total knee arthroplasty (TKA) causes abnormal patellar tracking, which could result in patellar instability, pain, wear, and failure. Previous reports defined medialization in relation to the neutral position of the femoral component, but omitted to compare it to the anatomical position of the(More)
OBJECTIVE AND IMPORTANCE Cervical arthroplasty is a relatively new method to maintain motion after cervical anterior discectomy. Two cases are presented in which bony fusion occurred around a cervical disc prosthesis. CLINICAL PRESENTATION A 30-year-old man and a 49-year-old woman underwent a right-sided anterior cervical discectomy because of pain in the(More)
The treatment of lumbar spinal stenosis is either conservative or surgical decompression. Recently, an interspinous decompression device (X-Stop) has been developed as an alternative. Patients treated with an X-Stop between 2003 and 2006 are subject of this study. The SF-36 Health Survey and Zürich Questionnaires are used. The data of pre- and(More)
Reconstruction of normal geometric relationships, regardless of original pathology, has to be the goal when treating angular kyphosis. Since anterior and posterior spinal structures are involved, successful decompression, correction, and stabilization require both dorsal and ventral surgery. By using segmental transpedicled and ventrolateral Instrumentation(More)
Postinjury cervical spine instability typically requires surgical treatment in the acute or semiacute stage. The authors, however, report on three patients with older (> 8 weeks) untreated bilateral cervical facet dislocation. In two patients they attempted a classic anterior-posterior-anterior approach but failed. The misalignment in the second stage of(More)
STUDY DESIGN A case report is presented. OBJECTIVE To report and discuss a case of primary non-Hodgkin's lymphoma in 10 different vertebrae in the spine of a 25-year-old woman. SUMMARY OF BACKGROUND DATA To the authors' knowledge, a case of primary bone lymphoma in several vertebrae has not been reported previously. METHODS Primary bone lymphoma was(More)
Study Design/Objective. A single-centre, prospective, non-comparative study of 25 patients to evaluate the performance and safety of the Memory Metal Minimal Access Cage (MAC) in Lumbar Interbody Fusion. Summary of Background Data. Interbody fusion cages in general are designed to withstand high axial loads and in the meantime to allow ingrowth of new bone(More)