Precise 3D skeletal kinematics using fast phase contrast magnetic resonance imaging

Rebmann, Andrea J; Sheehan, Frances T.

doi:10.1002/jmri.10253

Cited by 52 publications

(48 citation statements)

References 24 publications

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“…Thus, the need to visually identify anatomic landmarks at multiple times, as has been necessary previously [5], was eliminated. This approach has high reported accuracy (\ 0.5 mm [42]) and precision (\ 1.168 [36]) in tracking 3D PF displacements and rotations.…”

Section: Methodsmentioning

confidence: 99%

Q-angle and J-sign: Indicative of Maltracking Subgroups in Patellofemoral Pain

Sheehan

Derasari

Fine

et al. 2010

Clinical Orthopaedics &Amp; Related Research

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106

103

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Mechanical factors related to patellofemoral pain syndrome and maltracking are poorly understood. Clinically, the Q-angle, J-sign, and lateral hypermobility commonly are used to evaluate patellar maltracking. However, these measures have yet to be correlated to specific three-dimensional patellofemoral displacements and rotations. Thus, we tested the hypotheses that increased Q-angle, lateral hypermobility, and J-sign correlate with three-dimensional patellofemoral displacements and rotations. We also determined whether multiple maltracking patterns can be discriminated, based on patellofemoral displacements and rotations. Three-dimensional patellofemoral motion data were acquired during active extensionflexion using dynamic MRI in 30 knees diagnosed with patellofemoral pain and at least one clinical sign of patellar maltracking (Q-angle, lateral hypermobility, or J-sign) and in 37 asymptomatic knees. Although the Q-angle is assumed to indicate lateral patellar subluxation, our data supported a correlation between the Q-angle and medial, not lateral, patellar displacement. We identified two distinct maltracking groups based on patellofemoral lateral-medial displacement, but the same groups could not be discriminated based on standard clinical measures (eg, Q-angle, lateral hypermobility, and J-sign). A more precise definition of abnormal three-dimensional patellofemoral motion, including identifying subgroups in the patellofemoral pain population, may allow more targeted and effective treatments.

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Section: Methodsmentioning

confidence: 99%

Q-angle and J-sign: Indicative of Maltracking Subgroups in Patellofemoral Pain

Sheehan

Derasari

Fine

et al. 2010

Clinical Orthopaedics &Amp; Related Research

Self Cite

106

103

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“…Using a sagittal or sagittaloblique imaging plane, which was generally perpendicular to the femoral epicondyles and bisected the patella, a full fast-PC MRI data set (anatomic and x,y,z velocity images for 24 time frames) was acquired. The MR scanning protocol details have been provided previously (Rebmann and Sheehan, 2003).…”

Section: Methodsmentioning

confidence: 99%

The 3D patellar tendon moment arm: Quantified in vivo during volitional activity

Sheehan¹

2007

Journal of Biomechanics

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The patellar tendon moment arm is a critical quantity in that it defines the quadriceps ability to generate a moment on the tibia. Thus, the primary purpose of this study was to establish the first in vivo three-dimensional measures of the patellar tendon moment arm, measured non-invasively and in vivo during dynamic activity in a large normative population (n=34) using a dynamic MRI technique (fast-PC MRI). The magnitude of the moment arm was defined as the shortest distance between the finite helical axis and the patellar tendon line of action. Using these data, the hypothesis that the patellar tendon moment arm is independent of gender was tested. In general, the moment arm increased from 20 mm to 50 mm during knee extension. There were significant differences (P<0.05) in the moment arm between gender, but these differences were eliminated when the moment arm was scaled by the femoral epicondylar width. This study took a large step forward towards the ultimate goal of defining how pathology may alter joint dynamics through alteration in moment arms by establishing the first in vivo normative data base for the patellar tendon moment arm using noninvasive measures during volitional activity in a relatively large population (n=34). The fact that the scaled moment arm was independent of gender may lend insights into impairments that tend to be gender specific, such as patellar maltracking. The next steps will be to quantify the patellar tendon moment arm in populations with specific pathologies.

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“…58,62 However, to the best of the author's knowledge, the reliability of the actual radiograph/CT/MRI imaging procedure itself in the assessment of patellar alignment (ie, the reliability over repeated testing sessions) has only been investigated in 3 studies. Sheehan et al 83 and Rebmann and Sheehan 72 did look at the reliability of their dynamic MRI technique over 2 measurement periods, but this was done in the same testing session with the subject's position unaltered. Using kinematic MRI in 7 subjects, Powers 67 reported low intraobserver measurement error for sulcus angle (2°) and bisect offset measurement (3.4%), but high intraobserver measurement error for patellar tilt (2.9°).…”

Section: Reliabilitymentioning

confidence: 99%