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Sökning: L773:0364 2348 OR L773:1432 2161

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  • [1]23Nästa
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  • Christersson, Albert, et al. (författare)
  • Comparison of 2D radiography and a semi-automatic CT-based 3D method for measuring change in dorsal angulation over time in distal radius fractures
  • 2016
  • Ingår i: Skeletal Radiology. - 0364-2348 .- 1432-2161. ; 45:6, s. 763-769
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Objective The aim of the present study was to compare the reliability and agreement between a computer tomography-based method (CT) and digitalised 2D radiographs (XR) when measuring change in dorsal angulation over time in distal radius fractures. Materials and methods Radiographs from 33 distal radius fractures treated with external fixation were retrospectively analysed. All fractures had been examined using both XR and CT at six times over 6 months postoperatively. The changes in dorsal angulation between the first reference images and the following examinations in every patient were calculated from 133 follow-up measurements by two assessors and repeated at two different time points. The measurements were analysed using Bland-Altman plots, comparing intra- and inter-observer agreement within and between XR and CT. Results The mean differences in intra- and inter-observer measurements for XR, CT, and between XR and CT were close to zero, implying equal validity. The average intra- and inter-observer limits of agreement for XR, CT, and between XR and CT were +/- 4.4 degrees, +/- 1.9 degrees and +/- 6.8 degrees respectively. Conclusions For scientific purpose, the reliability of XR seems unacceptably low when measuring changes in dorsal angulation in distal radius fractures, whereas the reliability for the semi-automatic CT-based method was higher and is therefore preferable when a more precise method is requested.</p>
  • Gärdin, Anna, et al. (författare)
  • The long-term clinical and MRI results following eccentric calf muscle training in chronic Achilles tendinosis
  • 2010
  • Ingår i: Skeletal Radiology. - 0364-2348 .- 1432-2161. ; 39:5, s. 435-442
  • Tidskriftsartikel (refereegranskat)abstract
    • <p><strong>PURPOSE:</strong> To evaluate the long-term results following eccentric calf-muscle training in patients with chronic Achilles tendinopathy.</p><p><strong>MATERIALS AND METHODS:</strong> A total of 24 patients with chronic Achilles tendinopathy were included in a study evaluating MRI findings and clinical symptoms before and after 3 months of daily eccentric calf-muscle strength training. Median duration of symptoms was 18 months (range 6-120). Four of the patients did not perform the prescribed treatment for different reasons and were followed for 14 months. The resulting 20 treated patients completed 4.2-year (range 29-58 months) follow up. Tendon volume was evaluated by using 3D seed growing technique and signal abnormalities were visually semi-quantitatively graded. Level of pain and performance was categorized using a questionnaire completed by the patient.</p><p><strong>RESULTS:</strong> In the symptomatic treated patients, median intensity level of pain decreased from moderate/severe at time of inclusion to mild at follow up (p &lt; 0.05). Median level of performance increased from severe impairment at time of inclusion to normal at follow up (p &lt; 0.05). 12 out of 20 patients had raised intratendinous signal at time of inclusion compared to 2 out of 20 patients at follow up (p &lt; 0.001). Mean tendon-volume measured 6.7 cm(3) (SD 2.0) at time of inclusion and 6.4 cm(3) (SD 2.0) at follow up (p = 0.18). The four symptomatic non-treated tendons did not improve regarding pain, performance, intratendinous signal or tendon volume.</p><p><strong>CONCLUSION:</strong> We found decreased pain, improved performance and decreased intratendinous signal both compared to index examination and immediately after the 3 months training regimen in a 4.2-year clinical and MRI follow up, in a group of patients treated with heavy loaded eccentric calf-muscle training for chronic Achilles tendinopathy. The improvements were greater at 4.2-year follow up, despite no further active treatment, than immediately after the treatment. This may indicate a good long-term prognosis for Achilles tendinosis patients.</p>
  • Kjellberg, Martin, et al. (författare)
  • Measurement of leg length discrepancy after total hip arthroplasty : the reliability of a plain radiographic method compared to CT-scanogram
  • 2012
  • Ingår i: Skeletal Radiology. - Springer London. - 0364-2348 .- 1432-2161. ; 41:2, s. 187-191
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>To measure the interobserver reliability and intraobserver reproducibility of post total hip arthroplasty (THA) leg length discrepancy (LLD) measurement on radiographs as well as to evaluate its accuracy by comparing it with LLD measurement on computed tomographic scanogram (CT-scanogram). In this prospective study, postoperative LLD measurements in ten THA patients were made by four observers on anteroposterior radiographs of the pelvis (inter-teardrop line to the tip of lesser trochanter) and compared to LLD measurements made on CT-scanogram scout views of the lower limb. Two observers repeated the LLD measurements on radiographs 8 weeks after the first measurements. The interobserver reliability of the LLD measurement on plain radiographs was evaluated by comparing the measurements of the four observers and the intraobserver reproducibility by comparing the two repeated measurements made by the two observers. We found excellent interobserver reliability (mean ICC 0.83) and intraobserver reproducibility (ICC 0.90 and 0.88) of the LLD measurements on plain radiographs. There was a moderate to excellent agreement, but with wide variation of measurements among the four observers, when plain radiographic measurement was compared with CT-scanogram (ICC 0.58, 0.60, 0.71, and 0.82). Despite the excellent interobserver reliability and intraobserver reproducibility of LLD measurement on radiographs, clinicians should be aware of its limited accuracy when compared to CT-scanogram.</p>
  • Klintström, Eva, et al. (författare)
  • Trabecular bone structure parameters from 3D image processing of clinical multi-slice and cone-beam computed tomography data
  • 2014
  • Ingår i: Skeletal Radiology. - Springer. - 0364-2348 .- 1432-2161. ; 43:2, s. 197-204
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Objective</p><p>Bone strength depends on both mineral content and bone structure. The aim of this in vitro study was to develop a method of quantitatively assessing trabecular bone structure by applying three-dimensional image processing to data acquired with multi-slice and cone-beam computed tomography using micro-computed tomography as a reference.</p><p>Materials and Methods</p><p>Fifteen bone samples from the radius were examined. After segmentation, quantitative measures of bone volume, trabecular thickness, trabecular separation, trabecular number, trabecular nodes, and trabecular termini were obtained.</p><p>Results</p><p>The clinical machines overestimated bone volume and trabecular thickness and underestimated trabecular nodes and number, but cone-beam CT to a lesser extent. Parameters obtained from cone beam CT were strongly correlated with μCT, with correlation coefficients between 0.93 and 0.98 for all parameters except trabecular termini.</p><p>Conclusions</p><p>The high correlation between cone-beam CT and micro-CT suggest the possibility of quantifying and monitoring changes of trabecular bone microarchitecture in vivo using cone beam CT.</p>
  • Mahmood, Sarwar S, 1975-, et al. (författare)
  • Validity, reliability and reproducibility of plain radiographic measurements after total hip arthroplasty
  • 2015
  • Ingår i: Skeletal Radiology. - Springer. - 0364-2348 .- 1432-2161. ; 44:3, s. 345-351
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>In total hip arthroplasty (THA), radiographic preoperative planning and postoperative evaluation of acetabular component, femoral offset (FO) and leg length discrepancy (LLD) require good validity, interobserver reliability and intraobserver reproducibility. In this study, we evaluated the validity of the Sundsvall method of FO measurement and the interobserver reliability and intraobserver reproducibility of measurement of FO, LLD, acetabular cup inclination and anteversion. Ninety patients with primary unilateral osteoarthritis (OA) were included in this prospective study. On postoperative radiographs FO by the Sundsvall method (femoral axis-pelvic midline), FO by a standard method (femoral axis-hip rotational centre-teardrop point), LLD (inter-teardrop line-lesser trochanter), acetabular cup inclination (on AP view the angle between the cup rim and transischial line) and anteversion (on lateral view the angle between the face of acetabulum and a line perpendicular to the horizontal plane) were measured. The interobserver reliability and intraobserver reproducibility were calculated for three independent observers. The concurrent validity and degree of prediction of the Sundsvall method are measured by comparing its results with the standard method. The interobserver reliability of all measurements was excellent (ICC &gt; 0.80), except for LLD, which was substantial (ICC = 0.79). The intraobserver reproducibility of all measurements was excellent (ICC &gt; 0.80). The concurrent validity of the Sundsvall method compared to the standard method was good with a positive correlation. The Sundsvall method is as reliable as the standard method. The evaluated radiographic measurement methods have the required validity and reliability to be used in clinical practice.</p>
  • Petrén-Mallmin, M, et al. (författare)
  • Skeletal metastases from breast cancer : uptake of 18F-fluoride measured with positron emission tomography in correlation with CT
  • 1998
  • Ingår i: Skeletal Radiology. - 0364-2348 .- 1432-2161. ; 27:2, s. 72-76
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>OBJECTIVE:</p> <p>To characterise the uptake of 18F in skeletal metastases from breast cancer using positron emission tomography (PET) and to relate these findings to the appearance on CT.</p> <p>PATIENTS AND DESIGN:</p> <p>PET with 18F and CT were performed in five patients with multiple skeletal metastases from breast cancer. The CT characteristics were analysed in areas with high uptake on the PET study. Dynamic PET imaging of the skeletal kinetics of the 18F-fluoride ion were included.</p> <p>RESULTS:</p> <p>The areas of abnormal high accumulation of 18F correlated well with the pathological appearance on CT. Lytic as well as sclerotic lesions had markedly higher uptake than normal bone, with a 5-10 times higher transport rate constant for trapping of the tracer in the metastatic lesions than in normal bone.</p> <p>CONCLUSION:</p> <p>PET with 18F-fluoride demonstrates very high uptake in lytic and sclerotic breast cancer metastases.</p>
  • Rosenthal, Daniel I., et al. (författare)
  • Skeletal Radiology : the year in review 2016
  • 2017
  • Ingår i: Skeletal Radiology. - 0364-2348 .- 1432-2161. ; 46:3, s. 295-298
  • Forskningsöversikt (refereegranskat)abstract
    • <p>A look back at Skeletal Radiology in 2016 reveals a sizable number of publications that significantly advanced the state of knowledge about diseases of the musculoskeletal system. This review summarizes the content of some of the most intriguing papers of the year.</p>
  • Rosenthal, Daniel I., et al. (författare)
  • Skeletal Radiology : The Year in Review 2017
  • 2018
  • Ingår i: Skeletal Radiology. - Springer. - 0364-2348 .- 1432-2161. ; 47:3, s. 303-305
  • Tidskriftsartikel (övrigt vetenskapligt)
  • Söderman, Tomas, et al. (författare)
  • Static and dynamic CT imaging of the cervical spine in patients with rheumatoid arthritis
  • 2015
  • Ingår i: Skeletal Radiology. - 0364-2348 .- 1432-2161. ; 44:2, s. 241-248
  • Tidskriftsartikel (refereegranskat)abstract
    • <p><strong>OBJECTIVE:</strong></p><p>To compare CR with CT (static and dynamic) to evaluate upper spine instability and to determine if CT in flexion adds value compared to MR imaging in neutral position to assess compression of the subarachnoid space and of the spinal cord.</p><p><strong>MATERIALS AND METHODS:</strong></p><p>Twenty-one consecutive patients with atlantoaxial subluxation due to rheumatoid arthritis planned for atlantoaxial fusion were included. CT and MRI were performed with the neck in the neutral position and CT also in flexion. CR in neutral position and flexion were obtained in all patients except for one subject who underwent examination in flexion and extension.</p><p><strong>RESULTS:</strong></p><p>CR and CT measurements of atlantoaxial subluxation correlated but were larger by CR than CT in flexion, however, the degree of vertical dislocation was similar with both techniques irrespective of the position of the neck. Cervical motion was larger at CR than at CT. The spinal cord compression was significantly worse at CT obtained in the flexed position as compared to MR imaging in the neutral position.</p><p><strong>CONCLUSIONS:</strong></p><p>Functional CR remains the primary imaging method but CT in the flexed position might be useful in the preoperative imaging work-up, as subarachnoid space involvement may be an indicator for the development of neurologic dysfunction.</p>
  • Weidenhielm, Lars, et al. (författare)
  • Prosthetic liner wear in total hip replacement : a longitudinal 13-year study with computed tomography.
  • 2018
  • Ingår i: Skeletal Radiology. - Springer. - 0364-2348 .- 1432-2161. ; s. 1-5
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>This case report follows a woman who had a total hip replacement in 1992 when she was 45 years old. Six serial computed tomography (CT) examinations over a period of 13 years provided information that allowed her revision surgery to be limited to liner replacement as opposed to replacement of the entire prosthesis. Additionally, they provided data that ruled out the presence of osteolysis and indeed none was found at surgery. In 2004, when the first CT was performed, the 3D distance the femoral head had penetrated into the cup was determined to be 2.6 mm. By 2017, femoral head penetration had progressed to 5.0 mm. The extracted liner showed wear at the thinnest part to be 5.5 mm, as measured with a micrometer. The use of modern CT techniques can identify problems, while still correctable without major surgery. Furthermore, the ability of CT to assess the direction of wear revealed that the liner wear changed from the cranial to dorsal direction.</p>
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