scholarly journals Capsular Ligament

2020 ◽  
Author(s):  
Keyword(s):  
Capsular Ligament

scholarly journals Multiscale modelling of the human lumbar facet capsular ligament: analysing spinal motion from the joint to the neurons

2018 ◽  
Vol 15 (148) ◽  
pp. 20180550
Author(s):  
Vahhab Zarei ◽  
Rohit Y. Dhume ◽  
Arin M. Ellingson ◽  
Victor H. Barocas
Keyword(s):  
Axial Rotation ◽  
Fe Model ◽  
Spinal Motion ◽  
Capsular Ligament ◽  
Segment Model ◽  
Motion Segment ◽  
Flexion Extension ◽  
Vertebral Kinematics ◽  
High Level ◽  
Lumbar Facet

Due to its high level of innervation, the lumbar facet capsular ligament (FCL) is suspected to play a role in low back pain (LBP). The nociceptors in the lumbar FCL may experience excessive deformation and generate pain signals. As such, understanding the mechanical behaviour of the FCL, as well as that of its underlying nerves, is critical if one hopes to understand its role in LBP. In this work, we constructed a multiscale structure-based finite-element (FE) model of a lumbar FCL on a spinal motion segment undergoing physiological motions of flexion, extension, ipsilateral and contralateral bending, and ipsilateral axial rotation. Our FE model was created for a generic FCL geometry by morphing a previously imaged FCL anatomy onto an existing generic motion segment model. The fibre organization of the FCL in our models was subject-specific based on previous analysis of six dissected specimens. The fibre structures from those specimens were mapped onto the FCL geometry on the motion segment. A motion segment model was used to determine vertebral kinematics under specified spinal loading conditions, providing boundary conditions for the FCL-only multiscale FE model. The solution of the FE model then provided detailed stress and strain fields within the tissue. Lastly, we used this computed strain field and our previous studies of deformation of nerves embedded in fibrous networks during simple deformations (e.g. uniaxial stretch, shear) to estimate the nerve deformation based on the local tissue strain and fibre alignment. Our results show that extension and ipsilateral bending result in largest strains of the lumbar FCL, while contralateral bending and flexion experience lowest strain values. Similar to strain trends, we calculated that the stretch of the microtubules of the nerves, as well as the forces exerted on the nerves' membrane are maximal for extension and ipsilateral bending, but the location within the FCL of peak microtubule stretch differed from that of peak membrane force.

scholarly journals Wrist Swelling in Kienböck's Disease

2018 ◽  
Vol 07 (05) ◽  
pp. 389-393
Author(s):  
Hirofusa Ichinose ◽  
Etsuhiro Nakao ◽  
Takaaki Shinohara ◽  
Masahiro Tatebe ◽  
Harumoto Yamada ◽  
...  
Keyword(s):  
Histological Examination ◽  
Resonance Imaging ◽  
Synovial Proliferation ◽  
Level Of Evidence ◽  
Kienböck’S Disease ◽  
Capsular Ligament ◽  
Kienböck's Disease ◽  
Magnetic Resonance Imaging Mri ◽  
Common Manifestation ◽  
Kienbock’S Disease

Background and Purpose Wrist swelling is a frequent clinical manifestation of Kienböck's disease, but no study has reported the site and pathology of wrist swelling in this disease. The aim of this study is to elucidate the site and pathology of wrist swelling in Kienböck's disease. Materials and Methods Dorsal and palmar soft tissue thicknesses of the wrist were measured on standard lateral radiographs of the wrist in 26 patients with Kienböck's disease and 30 subjects without intra-articular lesion. Axial magnetic resonance imaging (MRI) views were examined to detect the site of swelling. The dorsal capsular ligament in three patients with Kienböck's disease underwent histological examination. Results Radiographic study confirmed dorsal wrist swelling in 24 of 26 (92%) patients examined compared with the contralateral unaffected wrists. MRI demonstrated thickening of the dorsal capsular ligament and extensor layer with synovial proliferation. Histological examination revealed nonspecific chronic inflammation. Conclusion Dorsal wrist swelling in Kienböck's disease is a common manifestation and constitutes a part of pathology of Kienböck's disease, although further study is required to clarify the relation between wrist swelling and etiology of Kienböck's disease. Level of Evidence This is a Level III study.

scholarly journals The role of the facet capsular ligament in providing spinal stability

2018 ◽  
Vol 21 (13) ◽  
pp. 712-721 ◽  
Author(s):  
Emily A. Bermel ◽  
Victor H. Barocas ◽  
Arin M. Ellingson
Keyword(s):  
Spinal Stability ◽  
Capsular Ligament

Segond tibial condyle fracture: lateral capsular ligament avulsion.

Radiology ◽  
1986 ◽  
Vol 159 (2) ◽  
pp. 467-469 ◽  
Author(s):  
G W Dietz ◽  
D M Wilcox ◽  
J B Montgomery
Keyword(s):  
Capsular Ligament ◽  
Tibial Condyle ◽  
Lateral Capsular Ligament ◽  
Condyle Fracture
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