The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Anders Enocson - One of the best experts on this subject based on the ideXlab platform.
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Unipolar versus bipolar Exeter hip hemiarthroplasty: a prospective cohort study on 830 consecutive hips in patients with femoral neck fractures
International Orthopaedics, 2012Co-Authors: Anders Enocson, Carl Johan Hedbeck, Hans Törnkvist, Jan Tidermark, Lasse J. LapidusAbstract:Background Hip replacement using a hemiarthroplasty (HA) is a common surgical procedure in elderly patients with fractures of the femoral neck. Data from the Swedish Hip Arthroplasty Register suggest that there is a higher risk for revision surgery with the bipolar HA compared with the unipolar HA. Purpose In this study we analysed the reoperation and the Dislocation rates for Exeter HAs in patients with a displaced femoral neck fracture, comparing the unipolar and bipolar prosthetic designs. Additionally, we compared the outcome for HAs performed as a primary intervention with those performed secondary to failed internal fixation. Methods We studied 830 consecutive Exeter HAs (427 unipolar and 403 bipolar) performed either as a primary operation for a displaced fracture of the femoral neck or as a secondary procedure after failed internal fixation of a fracture of the femoral neck. Cox regression analyses were performed to evaluate factors associated with reoperation and prosthetic Dislocation. Age, gender, the surgeon’s experience, indication for surgery (primary or secondary) and type of HA (unipolar or bipolar) were tested as independent variables in the model. Results The prosthetic design (uni- or bipolar) had no influence on the risk for reoperation or Dislocation, nor had the age, gender or the surgeon’s experience. The secondary HAs were associated with a significantly increased risk for reoperation (HR 2.6, CI 1.5–4.5) or Dislocation (HR 3.3, CI 1.4–7.3) compared to the primary HAs. We found no difference in the risk for reoperation or Dislocation when comparing Exeter unipolar and bipolar HAs, but special attention is called for to reduce the risk of Prosthesis Dislocation and reoperation after a secondary HA.
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socket wall addition device in the treatment of recurrent hip Prosthesis Dislocation good outcome in 12 patients followed for 4 5 1 9 years
Acta Orthopaedica, 2006Co-Authors: Anders Enocson, Jan Minde, Olle SvenssonAbstract:Socket wall addition device in the treatment of recurrent hip Prosthesis Dislocation: good outcome in 12 patients followed for 4.5 (1-9) years
Lasse J. Lapidus - One of the best experts on this subject based on the ideXlab platform.
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Unipolar versus bipolar Exeter hip hemiarthroplasty: a prospective cohort study on 830 consecutive hips in patients with femoral neck fractures
International Orthopaedics, 2012Co-Authors: Anders Enocson, Carl Johan Hedbeck, Hans Törnkvist, Jan Tidermark, Lasse J. LapidusAbstract:Background Hip replacement using a hemiarthroplasty (HA) is a common surgical procedure in elderly patients with fractures of the femoral neck. Data from the Swedish Hip Arthroplasty Register suggest that there is a higher risk for revision surgery with the bipolar HA compared with the unipolar HA. Purpose In this study we analysed the reoperation and the Dislocation rates for Exeter HAs in patients with a displaced femoral neck fracture, comparing the unipolar and bipolar prosthetic designs. Additionally, we compared the outcome for HAs performed as a primary intervention with those performed secondary to failed internal fixation. Methods We studied 830 consecutive Exeter HAs (427 unipolar and 403 bipolar) performed either as a primary operation for a displaced fracture of the femoral neck or as a secondary procedure after failed internal fixation of a fracture of the femoral neck. Cox regression analyses were performed to evaluate factors associated with reoperation and prosthetic Dislocation. Age, gender, the surgeon’s experience, indication for surgery (primary or secondary) and type of HA (unipolar or bipolar) were tested as independent variables in the model. Results The prosthetic design (uni- or bipolar) had no influence on the risk for reoperation or Dislocation, nor had the age, gender or the surgeon’s experience. The secondary HAs were associated with a significantly increased risk for reoperation (HR 2.6, CI 1.5–4.5) or Dislocation (HR 3.3, CI 1.4–7.3) compared to the primary HAs. We found no difference in the risk for reoperation or Dislocation when comparing Exeter unipolar and bipolar HAs, but special attention is called for to reduce the risk of Prosthesis Dislocation and reoperation after a secondary HA.
Shing Sheng Wu - One of the best experts on this subject based on the ideXlab platform.
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disassembly and Dislocation of a bipolar hip Prosthesis
Journal of the Formosan Medical Association, 2008Co-Authors: Yung Chih Lo, Shing Sheng WuAbstract:Dislocation of a hip Prosthesis is a common complication. In usual cases of hip Prosthesis Dislocation, the prosthetic femoral head comes out from either the natural acetabular cavity in a bipolar hemiarthroplasty or the prosthetic acetabulum in a total hip arthroplasty. Only a few cases of bipolar hip Prosthesis Dislocation due to dissociation between the polyethylene and inner head of the Prosthesis have been reported. We describe a rare case of disassembly of the inner head from the bipolar outer Prosthesis in an osteoarthritic acetabulum. A 72-year-old woman had undergone bipolar hemiarthroplasty due to fracture of the left femoral neck about 10 years previously. Recently, she sustained an injury after falling from a chair, and examinations revealed an unusual disassembly−Dislocation of the bipolar hip Prosthesis. We classified this failure in our patient as a type II failure, representing extreme varus position of the outer head in the acetabulum, Dislocation of the inner head from the outer head, and a detached locking ring around the stem neck. This mechanism of failure as shown in our patient rarely occurs in the bipolar Prosthesis of the self-centering system. Osteoarthritic change of the acetabulum would place the outer head in the varus position, increasing wear on the beveled rim by impinging the femoral stem neck and causing dislodgment of the inner locking ring and consequent disassembly−Dislocation of the inner head.
Murad Abdunabi - One of the best experts on this subject based on the ideXlab platform.
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atraumatic patellar Prosthesis Dislocation with patellar tendon injury following a total knee arthroplasty a case report
Journal of Medical Case Reports, 2010Co-Authors: Vinay Kumar Singh, Pankaj Singh, Yashwant Singh, Alka Singh, Sadaf Javed, Murad AbdunabiAbstract:Introduction Total knee arthroplasty is a well-established procedure with gratifying results. There is no consensus in the literature whether to routinely resurface the patella while performing total knee arthroplasty or not. Although an extremely rare occurrence in clinical practice, patellar Prosthesis Dislocation is a possible complication resulting from total knee arthroplasty.
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Atraumatic patellar Prosthesis Dislocation with patellar tendon injury following a total knee arthroplasty: a case report
Journal of Medical Case Reports, 2010Co-Authors: Vinay Kumar Singh, Yashwant Singh, Alka Singh, Sadaf Javed, Pankaj Kumar Singh, Murad AbdunabiAbstract:Introduction Total knee arthroplasty is a well-established procedure with gratifying results. There is no consensus in the literature whether to routinely resurface the patella while performing total knee arthroplasty or not. Although an extremely rare occurrence in clinical practice, patellar Prosthesis Dislocation is a possible complication resulting from total knee arthroplasty. Case presentation We report a rare case of atraumatic spontaneous Dislocation of patellar Prosthesis in a 63-year-old Caucasian man of British origin with patellar tendon injury. The patient was treated successfully through a revision of the patellar component and tendon repair. In two years follow-up the patient is asymptomatic with no sign of loosening of his patellar Prosthesis. Conclusions A thorough understanding of knee biomechanics is imperative in performing total knee arthroplasty in order to achieve a better functional outcome and to prevent early prosthetic failure.
You Wang - One of the best experts on this subject based on the ideXlab platform.
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feasibility and safety of a cemented peek on pe knee replacement in a goat model a preliminary study
Artificial Organs, 2018Co-Authors: Zhe Du, Zhanchun Li, You WangAbstract:Polyether-ether-ketone (PEEK) is a potential alternative to metal alloys for use in the orthopedic implants; however, an in vivo study in an appropriate animal model is essential and has not yet been initiated. The aim of the present study was to gather some preliminary evidence regarding the performance and safety of a cemented PEEK-based knee replacement device in a goat model. Fifteen adult goats were randomly divided into two groups; the control group (n = 5), which received a sham operation, and the experimental group (n = 10), which received a total knee arthroplasty with a PEEK-based knee replacement device. The animals were sacrificed at 12 (control n = 5; experimental n = 5) or 24 weeks (experimental n = 5). Blood parameter measurements and radiographs of the knee joints were obtained. The synovium and main organs were removed and histologically assessed. The knee joints with the Prosthesis were analyzed via micro-computed tomography and laser confocal microscopy. There was no occurrence of implant fracture or Prosthesis sinking during the 24 weeks of radiological observations, except for one case of Prosthesis Dislocation at 4 weeks. There was a 6% decrease in femoral bone density (BD) at 12 weeks, but no further decrease by 24 weeks. No changes in BD were observed in the tibial ends. The bulk implant was biocompatible in terms of histological analysis of the local synovium and organs. There were no optical scratches on the surface of the retrieved components; the femoral component surface was rougher, while the tibial insert was smoother after 24 weeks. The novel PEEK-based knee replacement device in a goat model was feasible and safe; however, prior to use in humans, further studies concerning PEEK high load-bearing implant designs should be carried out to expand on our results.
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Feasibility and Safety of a Cemented PEEK‐on‐PE Knee Replacement in a Goat Model: A Preliminary Study
Artificial Organs, 2018Co-Authors: Zhe Du, Zhanchun Li, You WangAbstract:: Polyether-ether-ketone (PEEK) is a potential alternative to metal alloys for use in the orthopedic implants; however, an in vivo study in an appropriate animal model is essential and has not yet been initiated. The aim of the present study was to gather some preliminary evidence regarding the performance and safety of a cemented PEEK-based knee replacement device in a goat model. Fifteen adult goats were randomly divided into two groups; the control group (n = 5), which received a sham operation, and the experimental group (n = 10), which received a total knee arthroplasty with a PEEK-based knee replacement device. The animals were sacrificed at 12 (control n = 5; experimental n = 5) or 24 weeks (experimental n = 5). Blood parameter measurements and radiographs of the knee joints were obtained. The synovium and main organs were removed and histologically assessed. The knee joints with the Prosthesis were analyzed via micro-computed tomography and laser confocal microscopy. There was no occurrence of implant fracture or Prosthesis sinking during the 24 weeks of radiological observations, except for one case of Prosthesis Dislocation at 4 weeks. There was a 6% decrease in femoral bone density (BD) at 12 weeks, but no further decrease by 24 weeks. No changes in BD were observed in the tibial ends. The bulk implant was biocompatible in terms of histological analysis of the local synovium and organs. There were no optical scratches on the surface of the retrieved components; the femoral component surface was rougher, while the tibial insert was smoother after 24 weeks. The novel PEEK-based knee replacement device in a goat model was feasible and safe; however, prior to use in humans, further studies concerning PEEK high load-bearing implant designs should be carried out to expand on our results.
