Insertion of tantalum beads in RSA of the hipVariations in incidence of extra-osseous beads with insertion site

Lawrie, David; Downing, Martin J.; Ashcroft, G. W.; Gibson, Peter H.

doi:10.1080/00016470310017695

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…In the clinical setting, however, some markers may have to be placed in less than optimal locations due to fracture configuration, and some markers may even become loose with time. In a recent study by Lawrie et al, 44% of hip arthroplasty patients had at least one loosened marker in soft tissues [17]. To accommodate these circumstances, the current results favor the use of at least four markers in each bone fragment in the distal radial fractures.…”

Section: Discussionmentioning

confidence: 61%

Accuracy and precision of radiostereometric analysis in the measurement of three‐dimensional micromotion in a fracture model of the distal radius

Madanat

Mäkinen

Moritz

et al. 2005

Journal Orthopaedic Research

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The purpose of the current study was to verify the feasibility of radiostereometric analysis (RSA) in monitoring three-dimensional fracture micromotion in fractures of the distal radius. The experimental set-up consisted of a simulated model of an extra-articular Colles' fracture, including metallic beads inserted into the bone on either side of the fracture site. The model was rigidly fixed to high precision micrometer stages allowing controlled translation in three axes and rotation about the longitudinal and transverse axes. The whole construct was placed inside a RSA calibration cage with two perpendicular radiographic film cassettes. Accuracy was calculated as the 95% prediction intervals from the regression analyses between the micromotion measured by RSA and actual displacements measured by micrometers. Precision was determined as the standard deviation of five repeated measurements of a 200pm displacement or a 0.5" rotation along a specific axis. Translations from 25 pm to 5mm were measured with an accuracy of k6pm and translations of 200pm were measured with a precision of 2-6pm. Rotations ranging from 1/6" to 2" were measured with an accuracy of f0.073" and rotations of 1/2" were measured with a precision of 0.025"-0.096". The number of markers and their configuration had greater impact on the accuracy and precision of rotation than on those of translation. Aside from the unknown rate of clinical marker loosening, the current results favor the use of at least four markers in each bone fragment in distal radius fractures. These results suggest a strong rationale for the use of RSA as an objective tool for comparing different treatment modalities and novel bone graft substitutes aimed at stabilization of fractures of the distal radius.

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Section: Discussionmentioning

confidence: 61%

Accuracy and precision of radiostereometric analysis in the measurement of three‐dimensional micromotion in a fracture model of the distal radius

Madanat

Mäkinen

Moritz

et al. 2005

Journal Orthopaedic Research

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“…RSA requires the use of tantalum beads placed into the implants and bone. This limits the use of RSA (Lawrie et al 2003 ). The View Pro-X software was found to be a reliable method in clinical practice for the assessment of linear FHP to determine the polyethylene wear, with good inter- and intra-class reliability (Martell et al 2003 , Geerdink et al 2008 ).…”

Section: Discussionmentioning

confidence: 99%

A vitamin E blended highly cross-linked polyethylene acetabular cup results in less wear: 6-year results of a randomized controlled trial in 199 patients

et al. 2020

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Background and purpose — Survivorship of total hip arthroplasty (THA) with the ultra-high molecular weight polyethylene (UHMWPE) monoblock cup has been limited due to periprosthetic osteolysis and aseptic loosening, secondary to wear of the UHMWPE. In response, a vitamin E blended highly cross-linked polyethylene (HXLPE) cup was developed. This study set out to compare the wear and clinical 6-year outcomes of vitamin E blended HXLPE with UHMWPE in an isoelastic monoblock cup in patients with hip osteoarthritis who underwent uncemented THA. The 2-year results have been reported previously. Patients and methods — For this randomized controlled trial 199 patients were included. 102 patients received the vitamin E blended HXLPE uncemented acetabular cup and 97 patients the uncemented UHMWPE monoblock cup. Clinical and radiographic parameters were obtained preoperatively, directly postoperatively, and at 3, 12, 24, and 72 months. Wear rates were compared using the femoral head penetration (FHP) rate. Results — 173 patients (87%) completed the 6-year follow-up. The mean NRS scores for rest pain, load pain, and patient satisfaction were 0.3 (SD 1), 0.6 (SD 1), and 8.6 (SD 1) respectively. The mean Harris Hip Score was 93 (SD 12). The FHP rate was lower in the vitamin E blended HXLPE cup (0.028 mm/year) compared with the UHMWPE cup (0.035 mm/year) (p = 0.002). No adverse reactions associated with the clinical application of vitamin E blended HXLPE were observed. 15 complications occurred, equally distributed between the two cups. The 6-year survival to revision rate was 98% for both cups. There was no aseptic loosening. Interpretation — This study shows the superior performance of the HXLPE blended with vitamin E acetabular cup with clinical and radiographic results similar to the UHMWPE acetabular cup.

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“…Radiostereometric analysis (RSA) may be a way forward. RSA involves implantation of tantalum markers to analyze implant and joint micromotion and has been shown to be accurate [4,9,12,16,21]. Further work is needed to evaluate this technology for use in TDR ROM measurements.…”

Section: Discussionmentioning

confidence: 99%

Radiographic total disc replacement angle measurement accuracy using the Oxford Cobbometer: precision and bias

et al. 2008

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Total disc replacement (TDR) clinical success has been reported to be related to the residual motion of the operated level. Thus, accurate measurement of TDR range of motion (ROM) is of utmost importance. One commonly used tool in measuring ROM is the Oxford Cobbometer. Little is known however on its accuracy (precision and bias) in measuring TDR angles. The aim of this study was to assess the ability of the Cobbometer to accurately measure radiographic TDR angles. An anatomically accurate synthetic L4-L5 motion segment was instrumented with a CHARITE artificial disc. The TDR angle and anatomical position between L4 and L5 was fixed to prohibit motion while the motion segment was radiographically imaged in various degrees of rotation and elevation, representing a sample of possible patient placement positions. An experienced observer made ten readings of the TDR angle using the Cobbometer at each different position. The Cobbometer readings were analyzed to determine measurement accuracy at each position. Furthermore, analysis of variance was used to study rotation and elevation of the motion segment as treatment factors. Cobbometer TDR angle measurements were most accurate (highest precision and lowest bias) at the centered position (95.5%), which placed the TDR directly inline with the x-ray beam source without any rotation. In contrast, the lowest accuracy (75.2%) was observed in the most rotated and off-centered view. A difference as high as 4°between readings at any individual position, and as high as 6°between all the positions was observed. Furthermore, the Cobbometer was unable to detect the expected trend in TDR angle projection with changing position. Although the Cobbometer has been reported to be reliable in different clinical applications, it lacks the needed accuracy to measure TDR angles and ROM. More accurate ROM measurement methods need to be developed to help surgeons and researchers assess radiological success of TDRs.

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Insertion of tantalum beads in RSA of the hipVariations in incidence of extra-osseous beads with insertion site

Cited by 10 publications

References 11 publications

Accuracy and precision of radiostereometric analysis in the measurement of three‐dimensional micromotion in a fracture model of the distal radius

Accuracy and precision of radiostereometric analysis in the measurement of three‐dimensional micromotion in a fracture model of the distal radius

A vitamin E blended highly cross-linked polyethylene acetabular cup results in less wear: 6-year results of a randomized controlled trial in 199 patients

Radiographic total disc replacement angle measurement accuracy using the Oxford Cobbometer: precision and bias

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