Effect of patient position on measurement of patellar height ratio

Narkbunnam, Rapeepat; Chareancholvanich, Keerati

doi:10.1007/s00402-015-2268-9

Cited by 36 publications

(37 citation statements)

References 23 publications

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“…Numerous MRI-based quantitative measurement parameters have been proposed as diagnostic criteria and/or guiding factors for clinical management strategies in cases of PI [4]. However, there are some clinical factors that may affect the reliability of these measurement parameters, such as the knee flexion angle and quadriceps action [9–13]. In clinical practice, the knee is usually flexed to some degree due to the MRI coil shape, the knee position in the coil, and differences in operator habits [12].…”

Section: Introductionmentioning

confidence: 99%

Patellar instability: the reliability of magnetic resonance imaging measurement parameters

et al. 2019

BMC Musculoskelet Disord

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Background Radiological assessments are considered an important part of the management of patellar instability (PI). However, PI measurements are influenced by the knee position, which cannot be guaranteed to be the same for each examination. Therefore, we aimed to determine the reliability of common PI measurements on magnetic resonance imaging (MRI). Methods Two MRI examinations within a 6-month period were obtained from 51 knees. The common PI measurements were quantitatively determined and re-evaluated. The intraclass correlation coefficients (ICC), Bland–Altman plot, standard error of measurement (SEM), and minimal detectable change (MDC) were used to determine the intra-observer, inter-observer, and inter-scan reliability. Results Adequate intra- and inter-observer reliability was obtained for all PI measurements (all ICCs > 0.8). For patellar positional parameters, the inter-scan reliability was adequate for the angle of Fulkerson, angle of Laurin, patellar tilt angle (PTA), lateral patellar displacement (LPD), and bisect offset ratio (BSO; ICCs = 0.723–0.897), although it was inadequate for the angle of Grelsamer and the congruence angle (CA; ICCs = 0.325–0.380). All parameters of trochlear dysplasia showed adequate inter-scan reliability (ICCs = 0.793–0.915). Nearly all patellar height parameters showed adequate inter-scan reliability (ICCs = 0.700–0.903), except the patellar trochlear index (PTI; ICC = 0.655). Conclusion All PI measurements showed adequate intra- and inter-observer reliability on MRI. Most measurements showed adequate inter-scan reliability, with the exception of the angle of Grelsamer, CA, and PTI. Electronic supplementary material The online version of this article (10.1186/s12891-019-2697-7) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Patellar instability: the reliability of magnetic resonance imaging measurement parameters

et al. 2019

BMC Musculoskelet Disord

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“…Conversely, Thakkar et al [13] and Chan et al [14] concluded quantitative trochlear parameters could be reliably calculated on MRI. The literature on quantitative imaging is usually related to the patellar malalignment [15][16][17][18] .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of correlation between clinical and magnetic resonance imaging findings of patellar chondromalacia

Özel¹

2020

Haydarpasa Numune Med J

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Introduction: To evaluate the correlation between clinical appearance and magnetic resonance imaging features of chondromalacia that can determine the knee magnetic resonance indication and to define a novel chondral status indicator. Methods: This study was performed between May 2017 and February 2019. If the knee pain was suggestive for the presence of chondromalacia clinically, then VAS and Kujala AKPS were noted. For MRI evaluation, a patellar cartilage score (PCS) was defined to evaluate the mean patellar thickness (MPT) and MRI grading together. Results: Advanced chondromalacia was more common among females (p<0.01). There was a positive correlation between age and MRI grading and the correlation coefficient was calculated to be 0.56. The highest correlation coefficient obtained with PCS in comparing PCS, MCT (mean cartilage thickness) and MRI grading for the clinical relationship. To define advanced chondromalacia with VAS and AKPS cutoff values calculated to be 3 and 80 in ROC analysis. AKPS was a superior clinical indicator for advanced chondromalacia compared with VAS. The other demographic findings, such as age and gender relations, were concordant with the literature. Discussion and Conclusion: A potentially better method was defined to combine VAS with functional measurements, such as AKPS, to determine a knee status may be indicative of MRI evaluation. As a novel perspective, PCS was the best indicator of the chondral clinical status that consists of both the mean patellar thickness and magnetic resonance grading.

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“…[51314] These methods evaluate the patella height indirectly according to various tibial reference points. [15] Numerous studies have compared these measurement methods, and different authors have emphasised the various advantages of the different methods.…”

Section: Discussionmentioning

confidence: 99%

“…There are both positive and negative aspects of each of the indices, and the most commonly used indices are the Insall–Salvati (IS), modified Insall–Salvati (MIS), Caton–Deschamps (CD), and Blackburne–Peel (BP) indices. [2345] Of these, the Insall–Salvati index is known to be the most useful technique for orthopedic and radiology specialists. Because it is difficult to keep the knee in a standard position at 30° flexion for every lateral X-ray view, it would seem to be more appropriate to measure these indices on MRI sections.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of patella alta using MRI measurements in adolescents

Yılmaz

Özdemir

Şirin

et al. 2017

Indian Journal of Radiology and Imaging

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Purpose:To determine whether or not there were any differences in the measurement techniques used by orthopedic and radiology specialists in the evaluation of magnetic resonance (MR) images for the diagnosis of patella alta in adolescents.Materials and Methods:Evaluations were performed by three orthopedic specialists (Group I) and three radiology specialists (Group II) regarding the presence of patella alta in 40 adolescents cases using the Insall–Salvati, Caton–Deschamps, Blackburne–Peel, and modified Insall–Salvati indices on MR images obtained to diagnose patellar instability.Results:The Fleiss Kappa conformity levels for Insall–Salvati, Caton–Deschamps, Blackburne–Peel, and modified Insall–Salvati measurements were 0.531, 0.559, 0.246, and 0.272, respectively, in Group I, and 0.699, 0.346, 0.516, and 0.394, respectively, in Group II.Conclusion:The radiology specialists were found to have greater conformity in the evaluation of all patella alta indices, which was probably due to their greater familiarity with radiological measurements than that of the orthopedic specialists.

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Effect of patient position on measurement of patellar height ratio

Cited by 36 publications

References 23 publications

Patellar instability: the reliability of magnetic resonance imaging measurement parameters

Patellar instability: the reliability of magnetic resonance imaging measurement parameters

Evaluation of correlation between clinical and magnetic resonance imaging findings of patellar chondromalacia

Evaluation of patella alta using MRI measurements in adolescents

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