Journal ArticleDOI
Very low-dose computed tomography for planning and outcome measurement in knee replacement: THE IMPERIAL KNEE PROTOCOL
Johann Henckel,Robin R. Richards,K. Lozhkin,Simon Harris,F. Rodriguez y Baena,A.R.W. Barrett,Justin Cobb +6 more
TLDR
By refining the CT scanning protocol, the effective radiation dose received by the patient is reduced down to the equivalent of one long-leg standing radiograph, which will be more acceptable to obtain the three-dimensional data set produced by CT scanning.Abstract:
Surgeons need to be able to measure angles and distances in three dimensions in the planning and assessment of knee replacement. Computed tomography (CT) offers the accuracy needed but involves greater radiation exposure to patients than traditional long-leg standing radiographs, which give very little information outside the plane of the image. There is considerable variation in CT radiation doses between research centres, scanning protocols and individual scanners, and ethics committees are rightly demanding more consistency in this area. By refining the CT scanning protocol we have reduced the effective radiation dose received by the patient down to the equivalent of one long-leg standing radiograph. Because of this, it will be more acceptable to obtain the three-dimensional data set produced by CT scanning. Surgeons will be able to document the impact of implant position on outcome with greater precision.read more
Citations
More filters
Journal ArticleDOI
Radiation exposure from musculoskeletal computerized tomographic scans.
Debdut Biswas,Jesse E. Bible,Michael Bohan,Andrew K. Simpson,Peter G. Whang,Jonathan N. Grauer +5 more
TL;DR: Computerized tomographic scans of the axial and appendicular skeleton are associated with substantially elevated radiation exposures, but the effective dose declines substantially for anatomic structures that are further away from the torso.
Navigation improves accuracy of rotational alignment in total knee arthroplasty
TL;DR: In this paper, a prospective randomized study was designed to test whether an optical navigation system for total knee arthroplasty achieved greater implantation precision than a non-navigated technique.
Journal ArticleDOI
The painful metal-on-metal hip resurfacing
Alister Hart,Shiraz A. Sabah,Johann Henckel,Angus Lewis,Justin Cobb,Barry Sampson,Adam W.M. Mitchell,John A. Skinner +7 more
TL;DR: Metal artefact-reduction MRI, three-dimensional CT measurement of the position of the component and inductively-coupled plasma mass spectrometry analysis of cobalt and chromium levels in whole blood on 26 patients with unexplained pain following metal-on-metal resurfacing arthroplasty are carried out.
Journal ArticleDOI
The position and orientation of total knee replacement components: A COMPARISON OF CONVENTIONAL RADIOGRAPHS, TRANSVERSE 2D-CT SLICES AND 3D-CT RECONSTRUCTION
Michael T. Hirschmann,Praveen Konala,Felix Amsler,Farhad Iranpour,Niklaus F. Friederich,Justin Cobb +5 more
TL;DR: 3D-reconstructed images are sufficiently reliable to enable reporting of the position and orientation of the components in a poorly functioning TKR with concerns over component positioning, and are recommend 3D-CT as the investigation of choice.
Journal ArticleDOI
Accuracy of reconstruction of the hip using computerised three-dimensional pre-operative planning and a cementless modular neck
TL;DR: Pre-operative computerised three-dimensional planning appears to offer high accuracy in hip reconstruction as the difficulties likely to be encountered when restoring the anatomy can be anticipated and solved pre-operatively by optimising the selection of implants.
References
More filters
Journal ArticleDOI
Computer-assisted Knee Arthroplasty Versus a Conventional Jig-Based Technique. A Randomised, Prospective Trial
TL;DR: In this paper, a computer-assisted knee arthroplasty was compared with the conventional jig-based technique in 70 patients randomly allocated to receive either of the methods, and a significant improvement in the alignment of the components using computer assisted surgery in regard to femoral varus/valgus was reported.
Journal ArticleDOI
Computer-assisted total knee replacement: A CONTROLLED CADAVER STUDY USING A MULTI-PARAMETER QUANTITATIVE CT ASSESSMENT OF ALIGNMENT (THE PERTH CT PROTOCOL)
TL;DR: The computer-assisted total knee replacements showed better alignment in rotation and flexion of the femoral component, the posterior slope of the tibial component and in the matching of the Femoral and tibia components in rotation.
Journal ArticleDOI
Navigation improves accuracy of rotational alignment in total knee arthroplasty.
TL;DR: A prospective randomized study to test whether an optical navigation system for total knee arthroplasty achieved greater implantation precision than a nonnavigated technique found that patients in Group N had significantly better rotational alignment and flexion angle of the femoral component than patients in Groups C and C.
Navigation improves accuracy of rotational alignment in total knee arthroplasty
TL;DR: In this paper, a prospective randomized study was designed to test whether an optical navigation system for total knee arthroplasty achieved greater implantation precision than a non-navigated technique.
Doses to Patients from Medical X-ray Examinations in the UK - 2000 Review
D Hart,M.C. Hillier,B. F. Wall +2 more
TL;DR: Reference doses have been derived for a larger number of examinations on adults than previously and, for the first time, for three examinations on children, with specific values for five standard-sized patients corresponding to new born babies, 1, 5, 10 and 15 year olds.