Motion of the femoral condyles in flexion and extension during a continuous lunge

Tsai, Tsung‐Yuan; Li, Jingsheng; Wang, Shaobai; Hu, Hai; Zhang, Changqing; Rubash, Harry E.; Li, Guoan

doi:10.1002/jor.22826

Cited by 27 publications

(22 citation statements)

References 32 publications

(86 reference statements)

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“…The dynamic images of the knee during the single-legged lunge were captured using a fluoroscopic imaging system (Philips, WA, USA) at a frame rate of 30 Hz following a published protocol (Feng et al, 2015). Participants were asked to stand with feet apart at shoulder width and toes forward without any supporting devices.…”

Section: Methodsmentioning

confidence: 99%

“…The 3D CT-based knee model was also imported into the software and manipulated in 6 degrees-of-freedom (DOF) until the projections of the model matched the outlined silhouettes of the bones captured on the fluoroscopic images. Therefore, the dynamic knee motion was represented by a series of 3D knee models along the flexion path (Feng et al, 2015; Zhu and Li, 2012). Spline interpolations with 5° flexion increments were used to resample the knee kinematics.…”

Section: Methodsmentioning

confidence: 99%

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In-vivo analysis of flexion axes of the knee: Femoral condylar motion during dynamic knee flexion

Tsai

Rubash

et al. 2016

Clinical Biomechanics

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Background Transepicondylar axis and geometrical center axis are widely used for investigation of the knee kinematics and component alignment in total knee arthroplasty. However, the kinematic characteristics of these knee axes are not well defined in literature. This study investigated the femoral condylar motion during a dynamic flexion of the knee using different flexion axes. Methods Twenty healthy knees (10 males and 10 females) were CT scanned to create 3D anatomic models. The subjects performed a single leg flexion from full extension to maximal flexion while the knees were imaged using fluoroscopes. The femoral condyle translations in anterior-posterior and proximal-distal directions were described using clinical transepicondylar axis, surgical transepicondylar axis and geometrical center axis. Findings The subjects achieved −9.4° (SD 3.0°) hyperextension at full extension and 116.4° (SD 9.0°) at maximal flexion of the knee. The anterior-posterior translations of the three flexion axes were different for the medial condyle, but similar for the lateral condyle. Substantial variations of the condylar motion in proximal-distal direction were measured along the flexion path using these axes. While the surgical transepicondylar axis maintained condyle heights from full extension to 60° of flexion, geometrical center axis showed little changes in condyle heights from 30° to maximal knee flexion. The condyles moved distally beyond 90° flexion using both transepicondylar axes. Interpretation The femoral condylar motion measurement is sensitive to the selection of flexion axis. The different kinematic features of these axes provide an insightful reference when selecting a flexion axis in total knee arthroplasty component alignment.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

In-vivo analysis of flexion axes of the knee: Femoral condylar motion during dynamic knee flexion

Tsai

Rubash

et al. 2016

Clinical Biomechanics

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“…In terms of kinematics, human knee is a hinged system with 6 degreesof-freedom (DOFs), enabling combined movements not depending on rotation and translation, with flexionextension being the key movement. [33][34][35] The remaining DOFs are the upper/lower translations, medial/lateral translation, and internal/external rotations as abduction/adduction. Due to the use of a two-dimensional numerical model, only two movements can be considered such as the static standing position and the passive extension-flexion movement.…”

Section: Discussionmentioning

confidence: 99%

A numerical investigation of the infrapatellar fat pad

Fontanella

Macchi

Porzionato

et al. 2020

Proc Inst Mech Eng H

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The infrapatellar fat pad is an adipose tissue in the knee that facilitates the distribution of synovial fluid and absorbs impulsive actions generated through the joint. The correlation between morphological configuration and mechanical properties is analyzed by a computational approach. The microscopic anatomy of the infrapatellar fat pad is studied aiming to measure the dimension of adipose lobules and the thickness of connective septa. Results from histomorphometric investigations show that the infrapatellar fat pad is an inhomogeneous tissue, constituted by large lobules in the superficial part and smaller lobules in the deepest one. Finite element models of the infrapatellar fat pad are developed. The first model considers the inhomogeneous conformation of the infrapatellar fat pad, composed of micro- and macro-chambers, while the second model considers a homogeneous distribution of adipose lobules with similar dimensions. Computational analyses are performed considering the static standing configuration and the passive flexion–extension movement. The computational results allow us to identify the different stress and strain fields within the tissue and to appreciate the variation of the mechanical performance of the overall system considering the distribution of adipose lobules. Results show that the distribution of adipose lobules in macro- and micro-chambers allows major deformation of the infrapatellar fat pad, decreasing the stress inside the tissues.

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“…The cross point of the projection lines of two adjacent postures was defined as the center of rotation of the intervertebral segment (Dennis et al, 2005; Feng et al, 2015; Johal et al, 2005; Komistek et al, 2003; Moro-oka et al, 2008) (Fig. 2a).…”

Section: Methodsmentioning

confidence: 99%

Sagittal plane rotation center of lower lumbar spine during a dynamic weight-lifting activity

Zhan

Tsai

Wang

et al. 2016

Journal of Biomechanics

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This study investigated the center of rotation (COR) of the intervertebral segments of the lower lumbar spine (L4-L5 and L5-S1 segments) in sagittal plane during a weight-lifting (3.6 kg in each hand) extension activity performed with the pelvis constrained. Seven healthy subjects were studied using a dual fluoroscopic imaging technique. Using the non-weightbearing, supine position during MRI scan as a reference, the average intervertebral flexion angles of the L4-L5 and L5-S1 were 6.6° and 5.3° at flexion position of the body, respectively, and were −1.8° and −3.5° at extension position of the body, respectively. The CORs of the lower lumbar spine were found segment-dependent and changed with the body postures. The CORs of the L4-L5 segment were at the location about 75% posterior from the anterior edge of the disc at flexion positions of the body, and moved to about 92% of the posterior portion of the disc at extension positions of the body. The CORs of the L5-S1 segment were at 95% posterior portion of the disc at flexion positions of the body, and moved outside of the posterior edge of the disc by about 12% of the disc length at extension positions of the body. These results could help understand the physiological motion characters of the lower lumbar spine. The data could also provide important insights for future improvement of artificial disc designs and surgical implantation of the discs that are aimed to reproduce normal spinal functions.

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Motion of the femoral condyles in flexion and extension during a continuous lunge

Cited by 27 publications

References 32 publications

In-vivo analysis of flexion axes of the knee: Femoral condylar motion during dynamic knee flexion

In-vivo analysis of flexion axes of the knee: Femoral condylar motion during dynamic knee flexion

A numerical investigation of the infrapatellar fat pad

Sagittal plane rotation center of lower lumbar spine during a dynamic weight-lifting activity

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