MRI Versus Radiography of Acromioclavicular Joint Dislocation

Nemec, Ursula; Oberleitner, Gerhard; Nemec, Stefan F.; Gruber, M.; Weber, Michael; Czerny, Christian; Krestan, Christian

doi:10.2214/ajr.10.6378

Cited by 59 publications

(46 citation statements)

References 27 publications

(40 reference statements)

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“…This can be explained by the fact that patients were recruited in a clinical setting following lowenergy trauma. The prevalence of coracoclavicular ligaments damage is consistent with several studies on acromioclavicular joint injury [1,16]. One of the biases of this study is that each examination was performed by a single operator, making it impossible to assess the reproducibility of ultrasound.…”

Section: Discussionsupporting

confidence: 84%

“…Using the MRI and ultrasound images, we classified the injuries into three grades of increasing severity to analyse the integrity of the coracoclavicular ligaments [16]. If the score differed between the conoid and trapezoid ligaments, the most severe grade was retained.…”

Section: Methodsmentioning

confidence: 99%

“…If the score differed between the conoid and trapezoid ligaments, the most severe grade was retained. MRI was used as the gold standard for this study; it has been shown to be accurate when describing lesions of the coracoclavicular ligaments [4,5,16].…”

Section: Methodsmentioning

confidence: 99%

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Ultrasound of the coracoclavicular ligaments in the acute phase of an acromioclavicular disjonction: Comparison of radiographic, ultrasound and MRI findings

et al. 2016

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Section: Discussionsupporting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

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Ultrasound of the coracoclavicular ligaments in the acute phase of an acromioclavicular disjonction: Comparison of radiographic, ultrasound and MRI findings

et al. 2016

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“…In this context, preoperative MRI could prove of value for assessment ACLC tear patterns and identification of patients benefiting from mini-open surgery due to otherwise limited healing potential. Current ACJ-specific MRI techniques allow detailed assessment of ligamentous structures including the articular disc [11, 21, 29]. In our own series, we were able to distinguish distinct ACLC tear types and to diagnose articular disc dislocations in selective cases by means of ACJ-specific MRI (Fig.…”

Section: Discussionmentioning

confidence: 78%

Injury patterns of the acromioclavicular ligament complex in acute acromioclavicular joint dislocations: a cross-sectional, fundamental study

Maier

Jaeger

Reising

et al. 2016

BMC Musculoskelet Disord

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BackgroundHorizontal instability impairs clinical outcome following acute acromioclavicular joint (ACJ) reconstruction and may be caused by insufficient healing of the superior acromioclavicular ligament complex (ACLC). However, characteristics of acute ACLC injuries are poorly understood so far. Purposes of this study were to identify different ACLC tear types, assess type-specific prevalence and determine influencing cofactors.MethodsThis prospective, cross-sectional study comprised 65 patients with acute-traumatic Rockwood-5 (n = 57) and Rockwood-4 (n = 8) injuries treated operatively by means of mini-open ACJ reduction and hook plate stabilization. Mean age at surgery was 38.2 years (range, 19–57 years). Standardized pre- and intraoperative evaluation included assessment of ACLC tear patterns and cofactors related to the articular disc, the deltoid-trapezoidal (DT) fascia and bony ACJ morphology. Articular disc size was quantified as 0 = absent, 1 = remnant, 2 = meniscoid and 3 = complete.ResultsAll patients showed complete ruptures of the superior ACLC, which could be assigned to four different tear patterns. Clavicular-sided (AC-1) tears were observed in 46/65 (70.8 %), oblique (AC-2) tears in 12/65 (18.5 %), midportion (AC-3) tears in 3/65 (4.6 %) and acromial-sided (AC-4) tears in 4/65 (6.1 %) of cases. Articular disc size manifestation was significantly (P < .001) more pronounced in patients with AC-1 tears (1.89 ± 0.57) compared to patients with AC-2 tears (0.67 ± 0.89). Other cofactors did not influence ACLC tear patterns. ACLC dislocation with incarceration caused mechanical impediment to anatomical ACJ reduction in 14/65 (21.5 %) of cases including all Rockwood-4 dislocations. Avulsion “in continuity” was a consistent mode of failure of the DT fascia. Type-specific operative strategies enabled anatomical ACLC repair of all observed tear types.ConclusionsAcute ACLC injuries follow distinct tear patterns. There exist clavicular-sided (AC-1), oblique (AC-2), midportion (AC-3) and acromial-sided (AC-4) tears. Articular disc size was a determinant factor of ACLC tear morphology. Mini-open surgery was required in Rockwood-4 and a relevant proportion of Rockwood-5 dislocations to achieve both anatomical ACLC and ACJ reduction. Type-specific operative repair of acute ACLC tears might promote biological healing and lower rates of horizontal ACJ instability following acute ACJ reconstruction.

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“…Being non-invasive and sensitive to the molecular motions, magnetic resonance imaging (MRI) has undisputable potential to become the leading diagnostic tool for cartilage health (11)(12)(13)(14)(15)(16)(17)(18)(19). Several MRI protocols can in principle detect the early changes in OA cartilage, for example, T2 and T2 anisotropy, T1ρ, T1 with the use of contrast agent, and diffusion (20)(21)(22)(23)(24)(25).…”

Section: Original Articlementioning

confidence: 99%

Image interpolation improves the zonal analysis of cartilage T2 relaxation in MRI

Badar

Xia

2017

Quant. Imaging Med. Surg.

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Background: This project aimed to investigate the improvement in the detection of osteoarthritis (OA) in cartilage by the interpolation of T2 images, in the situation when the native MRI resolution is insufficient to resolve the depth-dependent T2 characteristics in articular cartilage (AC).Methods: Eighteen intact canine knee joints that were healthy or had mild (contralateral) or severe OA were T2-imaged in a 7T/20 cm MRI system at 200 µm/pixel resolution (macro-MRI). Two image analysis methods were used to interpolate the images to 100 µm/pixel, i.e., by Fourier-transforming the time-domain FID (Free Induction Decay) signal using the Varian NMR software and by interpolating the 2D T2 image using the ImageJ software. and the interpolated 100 µm resolutions were subdivided into two equal-thickness regions and three-equal thickness regions based on clinical MRI protocols. A new method divided the T2 profiles into three-unequal thickness zones according to the T2 profiles at 17.6 µm/pixel from the same cartilage imaged in a 7 Tesla/9 cm µMRI system. Both interpolation methods improved the depth-dependent T2 images/profiles in macro-MRI. The unequal zone division in T2 had better OA sensitivity than the equal zone division. The threeequal zone division of T2 profiles had better OA sensitivity than the two-equal zone division. The statistical significant difference between the healthy and mild OA cartilage is detected (P=0.0018) only by the unequal zone division method at 100 µm resolution.Conclusions: Data interpolation improves the T2 sensitivity in MRI of cartilage OA. Unequal division of tissue thickness enables better early stage of OA detection than the equal division.

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MRI Versus Radiography of Acromioclavicular Joint Dislocation

Abstract: In a considerable number of patients, the MRI findings change the Rockwood type determined with radiography. In addition to clinical assessment and radiography, MRI may yield important findings on ligaments that may influence management.

Cited by 59 publications

References 27 publications

Ultrasound of the coracoclavicular ligaments in the acute phase of an acromioclavicular disjonction: Comparison of radiographic, ultrasound and MRI findings

Ultrasound of the coracoclavicular ligaments in the acute phase of an acromioclavicular disjonction: Comparison of radiographic, ultrasound and MRI findings

Injury patterns of the acromioclavicular ligament complex in acute acromioclavicular joint dislocations: a cross-sectional, fundamental study

Image interpolation improves the zonal analysis of cartilage T2 relaxation in MRI

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