A Novel Magnetic Resonance Imaging Classification of Discoid Lateral Meniscus Based on Peripheral Attachment

2009 ◽  
Vol 37 (8) ◽  
pp. 1564-1569 ◽  
Author(s):  
Jin Hwan Ahn ◽  
Yong Seuk Lee ◽  
Hae Chan Ha ◽  
Jong Sup Shim ◽  
Kyung Sub Lim
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Lateral Meniscus ◽  
Discoid Lateral Meniscus ◽  
Resonance Imaging ◽  
Chi Square ◽  
Shift Type ◽  
Chi Square Test ◽  
Imaging Classification

Background In the symptomatic discoid lateral meniscus, the effectiveness of preoperative magnetic resonance imaging (MRI) is not well documented. Hypothesis Magnetic resonance imaging classification will provide more information to the surgeon in choosing the appropriate treatment methods with the help of arthroscopic findings. Study design Cohort study (diagnosis); Level of evidence, 2. Methods Sixty-seven patients (82 knees) were reviewed. The preoperative MRI was checked in 76 of 82 knees. The Lysholm and Ikeuchi grading scales were evaluated. Images were analyzed from MRI, and findings were classified into 4 categories: no shift, anterocentral shift, posterocentral shift, and central shift. Tear pattern classifications were based on arthroscopic findings: horizontal tear, peripheral tear, horizontal and peripheral tear, posterolateral corner loss, and others. The correlations between MRI classification tear patterns and surgical methods were analyzed using the chi-square test or the Fisher exact test. The sensitivity, specificity, and accuracy of shift in preoperative MRI–according to the existence of peripheral tear when corroborated with arthroscopy–were also analyzed with the chi-square test. Inter- and intraobserver reliability was statistically analyzed by producing the inter- and intraclass correlation coefficient. Results The mean preoperative Lysholm score was 77.3 (range, 43-97), and the last follow-up Lysholm score had increased to 96.8 (range, 84-100; P <. 001). At last follow-up (100% follow-up), the Ikeuchi grading scale scored 48 knees as excellent, 30 as good, and 4 as fair. According to the MRI classification, 43 knees were no shift; 6, anterocentral shift; 15, posterocentral shift; and 12, central shift. Shift-type knees had a significantly larger number of peripheral tears, and repairs were performed in the shift-type knees (55%) more frequently than in the no-shift-type knees (28%). Among 82 knees, 31 were repaired simultaneously after a central partial meniscectomy. Conclusion Magnetic resonance imaging classification provides more information to surgeons in choosing the appropriate treatment methods, although the final decision regarding procedure is made during arthroscopy after thorough analysis of the tear.

Discoid lateral meniscus in children: magnetic resonance imaging after arthroscopic resection

2011 ◽  
Vol 19 (11) ◽  
pp. 1920-1924 ◽  
Author(s):  
Susanne Mayer-Wagner ◽  
Alessandro von Liebe ◽  
Annie Horng ◽  
Andreas Scharpf ◽  
Tobias Vogel ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Lateral Meniscus ◽  
Discoid Lateral Meniscus ◽  
Resonance Imaging

scholarly journals Magnetic Resonance Imaging of the Cervical Spine: Frequency of Abnormal Findings with Relation to Age

Medicines ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 77
Author(s):  
Ali Alghamdi ◽  
Abeer Alqahtani
Keyword(s):  
Magnetic Resonance Imaging ◽  
Cervical Spine ◽  
Magnetic Resonance ◽  
Total Sample ◽  
Resonance Imaging ◽  
Mri Findings ◽  
Chi Square ◽  
Disc Bulge ◽  
Chi Square Test ◽  
Cervical Injuries

Background: Patients with neck pain are frequently encountered in cervical spine (C-spine) magnetic resonance imaging (MRI) practice. However, the exact distribution and prevalence of cervical abnormalities are not known. Aim: The aim of this study is to evaluate the association between age, gender, and prevalence of abnormal cervical MRI findings. Methods: Records of 111 cervical MRIs were collected in 12 months from January to December 2019 from adults aged 20–89 years who were referred from neurosurgery, neurology, and orthopedic clinics. Findings were classified and analyzed using the Statistical Package for Social Science (SPSS), version 24.0 (IBM, Armonk, NY, USA). The chi-square test was used to determine the association between demographics and abnormalities using a significance of p = 0.05. Results: The majority of patients were female (72.1%). The number of abnormal incidences increased with age until it reached a peak at ages 50–59. Spondylodegenerative changes were the most frequent finding, which was present in 52.2% of the total sample, and was followed by disc bulge (25.2%). Incidences increased in lower discs, with C5–C6 being the most frequent in 65% of the total sample. Younger males in their 20s had more injuries than females of the same age. However, this rate was reversed in patients over 40, as women were the dominant gender among patients in their 40s with cervical injuries, with a rate of 81.5%. Conclusion: In our study, we found that older patients developed more C-spine injuries. Gender may play a role in the rate of incidents. However, we did not find any significant differences between men and women or between different types of abnormalities.

scholarly journals Discrimination between Malignant and Benign Vertebral Fractures Using Magnetic Resonance Imaging

2017 ◽  
Vol 11 (3) ◽  
pp. 478-483 ◽  
Author(s):  
Tomoyuki Takigawa ◽  
Masato Tanaka ◽  
Yoshihisa Sugimoto ◽  
Tomoko Tetsunaga ◽  
Keiichiro Nishida ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Vertebral Fractures ◽  
Logit Model ◽  
Multivariate Logistic Regression Analysis ◽  
Resonance Imaging ◽  
Multivariate Logistic Regression ◽  
Chi Square ◽  
Mri Features ◽  
Chi Square Test

<sec><title>Study Design</title><p>Retrospective analysis using magnetic resonance imaging (MRI).</p></sec><sec><title>Purpose</title><p>To identify MRI features that could discriminate benign from malignant vertebral fractures.</p></sec><sec><title>Overview of Literature</title><p>Discrimination between benign and malignant vertebral fractures remains challenging, particularly in patients with osteoporosis and cancer. Presently, the most sensitive means of detecting and assessing fracture etiology is MRI. However, published reports have focused on only one or a few discriminators.</p></sec><sec><title>Methods</title><p>Totally, 106 patients were assessed by MRI within six weeks of sustaining 114 thoracic and/or lumbar vertebral fractures (benign, n=65; malignant, n=49). The fractures were pathologically confirmed if malignant or clinically diagnosed if benign and were followed up for a minimum of six months. Seventeen features were analyzed in all fractures' magnetic resonance images. Single parameters were analyzed using the chi-square test; a logit model was established using multivariate logistic regression analysis.</p></sec><sec><title>Results</title><p>The chi-square test revealed 11 malignant and 4 benign parameters. Multivariate logistic regression analysis selected (i) posterior wall diffuse protrusion (odds ratio [OR], 48; 95% confidence interval [CI], 4.2–548; <italic>p</italic>=0.002), (ii) pedicle involvement (OR, 21; 95% CI, 2.0–229; <italic>p</italic>=0.01), (iii) posterior involvement (OR, 21; 95% CI, 1.5–21; <italic>p</italic>=0.02), and (iv) band pattern (OR, 0.047; 95% CI, 0.0005–4.7; <italic>p</italic>=0.19). The logit model was expressed as P=1/[1+exp (x)], x=−3.88×(i)−3.05×(ii)−3.02×(iii)+3.05×(iv)+5.00, where P is the probability of malignancy. The total predictive value was 97.3%. The only exception was multiple myeloma with features of a benign fracture.</p></sec><sec><title>Conclusions</title><p>Although each MRI feature had a different meaning with a variable differentiation power, combining them led to an accurate diagnosis. This study identified the most relevant MRI features that would be helpful in discriminating benign from malignant vertebral fractures.</p></sec>

MENISCAL ABNORMALITIES: DISCOID MENISCUS

2012 ◽  
Vol 15 (01) ◽  
pp. 1230001
Author(s):  
Vivek Pandey ◽  
Simon Nurettin van Laarhoven ◽  
Kiran K. V. Acharya ◽  
Sharath K. Rao ◽  
Sripathi Rao
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Plain Radiograph ◽  
Lateral Meniscus ◽  
Partial Meniscectomy ◽  
Discoid Lateral Meniscus ◽  
Resonance Imaging ◽  
Discoid Meniscus ◽  
Short Term ◽  
Ring Type

The discoid meniscus is the most common meniscal variant. The likely etiology being congenital, the condition usually affects the lateral meniscus. Poorly vascularized, thicker and unstable, the discoid lateral meniscus (DLM) is more prone to tears due to abnormal shearing forces. Watanabe et al. (1979) classified the discoid lateral meniscus into three types: Complete, incomplete and Wrisberg type; Monllau et al. (1998) added the ring type as the fourth variant. Pain and clicks/thud are the most common presentations. Plain radiograph and magnetic resonance imaging are helpful in confirming the diagnosis. Asymptomatic DLM is best left alone. For symptomatic complete and incomplete types, partial arthroscopic saucerization is the treatment of choice leaving behind a stable rim. The Wrisberg type needs peripheral stabilization with resection of excess rim, if any. Total meniscectomy should be avoided unless inevitable. Short term results after partial meniscectomy are good.

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