The effect of coordinate system choice and segment reference on RSA-based knee translation measures

Beardsley, Christina; Paller, David; Peura, Glenn D.; Brattbakk, Bjarne; Beynnon, Bruce D.

doi:10.1016/j.jbiomech.2006.05.005

Cited by 15 publications

(17 citation statements)

References 35 publications

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“…In the current study, tester input is minimized by only requiring the selection of the data to be used to define the axis of the tibia and femur, the sagittal slices used, and the initial guesses for circle fit points for the flexion facet centers. In comparison to Beardsley, et al (2007) the variability in the origin point location for this study ranged from 0.26-0.47 mm for intra-tester repeatability, and in a study from our research group (Fjeld, 2007), inter-tester repeatability was 0.79 ± 0.42 mm.…”

Section: Three Dimensional Joint Motion and Acl Insertion Point Distancementioning

confidence: 45%

“…The registration technique enables low resolution scans to be used at the loaded conditions, thereby reducing scan time while The high resolution images are used to define embedded coordinate systems in the tibia and femur. This is an important element of the methodology, as a measure of anterior tibial translation has been shown to be sensitive to the joint coordinate system definition, yielding average differences of 4.2 mm (Beardsley, et al, 2007). However, Beardsley, et al (2007) defined coordinate systems by identifying bony geometry in lateral radiographs.…”

Section: Three Dimensional Joint Motion and Acl Insertion Point Distancementioning

confidence: 99%

“…This is an important element of the methodology, as a measure of anterior tibial translation has been shown to be sensitive to the joint coordinate system definition, yielding average differences of 4.2 mm (Beardsley, et al, 2007). However, Beardsley, et al (2007) defined coordinate systems by identifying bony geometry in lateral radiographs. The intertester repeatability was 1.8 to 3.3 mm for location of an anatomical point.…”

Section: Three Dimensional Joint Motion and Acl Insertion Point Distancementioning

confidence: 99%

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A Novel Measure of In-Vivo Knee Joint Laxity

Küpper

Ronsky

Frayne

et al. 2007

ASME 2007 Summer Bioengineering Conference

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Current measures of knee joint laxity, such as those found clinically using the KT-2000 arthrometer, are not highly repeatable or reliable (Huber et al, 1997). In this study, a non invasive in-vivo Magnetic Resonance imaging-based measure of laxity, the Knee Loading Apparatus (KLA), was designed and evaluated with five normal subjects (repeatability study, n=3). Effects of total body water content, hormones, and muscle guarding were considered. When compared to the KT-2000, the KLA was found to be less variable iii Acknowledgements

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Section: Three Dimensional Joint Motion and Acl Insertion Point Distancementioning

confidence: 45%

Section: Three Dimensional Joint Motion and Acl Insertion Point Distancementioning

confidence: 99%

Section: Three Dimensional Joint Motion and Acl Insertion Point Distancementioning

confidence: 99%

See 1 more Smart Citation

A Novel Measure of In-Vivo Knee Joint Laxity

Küpper

Ronsky

Frayne

et al. 2007

ASME 2007 Summer Bioengineering Conference

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“…Because a different definition of the mechanical or anatomical axis will result in a different kinematic interpretation, 5,13 using the same definition of the coordinate system is crucial to compare the current results with those reported in other studies. 5,13 In the present study, the definitions of the local coordinate systems were comparable between the normal knees and the TKA knees because all TKA prostheses were implanted on the basis of mechanical axes alignment, and the normal knee's coordinate systems were adopted from the CT scanning coordinate system with the patient in the straight supine position (This position is believed to reproduce most mechanical leg axes). Therefore, we think that the difference in flexional ROM between the normal knees and TKA knees is reliable.…”

Section: Discussionmentioning

confidence: 99%

“…13 When taking CT images of a normal knee, an orthopaedic surgeon manipulated patient's posture supine similar to the lower extremity alignment at upright posture. Hence, anatomical coordinates of the femur and the knee were inherited from the CT scanning coordinate setup.…”

Section: Coordinate Systems Of 3d Modelsmentioning

confidence: 99%

In vivo kinematics of a cruciate retaining mobile-bearing total knee arthroplasty

Lee

Park

Song

et al. 2011

Int. J. Precis. Eng. Manuf.

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In the total knee arthroplasty (TKA), kinematic benefits of the cruciate retaining (CR) mobile-bearing total knee arthroplasty are important. The current study aimed to assess how kinematic features of the anterior-posterior glide CR mobile-bearing TKA are different from those of normal knees or CR fixed-bearing TKA. Using a 3D/2D registration method, CT-derived 3D knee models were registered to sequential 2D X-ray images taken during knee flexion. Full range of knee flexion was 127.6° (SD 5.9) for normal knees, which was always larger than 110.8° (SD 14.0) of Nexgen CR fixed-bearing TKA or 108.1° (SD 8.0) of e.Motion CR mobile-bearing TKA. The rotation path of e.Motion CR mobile-bearing TKA demonstrated a small amount of internal or external femoral rotation from full extension over 40° flexion, steep increase in external femoral rotation from 40° to 90° flexion, then turned down in external rotation from 90° to full flexion. In contrast, Nexgen CR fixedbearing TKA did not demonstrate any consistent kinematic pattern among subjects. e.Motion CR mobile-bearing TKA can be more preferable because it showed a rotational turning point at 90° flexion that was comparable to normal knees' rotational turning point at 80° flexion.

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Changes in in vitro compressive contact stress in the rat tibiofemoral joint with varus loading

Gardner‐Morse

Badger

Beynnon

et al. 2013

Journal of Biomechanics

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Increased compression of the tibiofemoral joint, due to increased body mass or malalignment, is a risk factor for the onset and progression of osteoarthritis. This work investigates compressive stresses and contact areas in the articular cartilage of the rat tibiofemoral joint during standing with different applied varus loads. Cadaver rat knees underwent loading of the extensors combined with varus loading (0%, 50% or 100% of bodyweight) of the tibiofemoral joint. Articular cartilage contact stress was evaluated using stereophotogrammetric measurements of biplanar radiographs, high-resolution micro-computed tomography and discrete element analysis. Random coefficients regression models were used to analyze the relationship between peak and spatially averaged contact stresses and contact areas as a function of increasing varus loadings. The contact stresses increased linearly in the medial compartment. Peak stress significantly increased 0.042 MPa (p=0.006) and spatially averaged stress significantly increased 0.029 MPa (p=0.045) for each 10% increase in varus loading. There was a trend for a small decrease in contact areas in the lateral compartment with varus loading. This is the first report of the contact stresses in a rat tibiofemoral joints under simulated weight bearing conditions. The 0.42 MPa increase in peak contact stress at the cartilage-cartilage interface of the medial compartment with 100% bodyweight varus load is similar to the reported change in peak contact stress associated with development of symptomatic knee osteoarthritis in humans. Determination of contact stresses in rat tibiofemoral joints allows comparison to contact stresses in humans with the development of osteoarthritis.

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The effect of coordinate system choice and segment reference on RSA-based knee translation measures

Cited by 15 publications

References 35 publications

A Novel Measure of In-Vivo Knee Joint Laxity

A Novel Measure of In-Vivo Knee Joint Laxity

In vivo kinematics of a cruciate retaining mobile-bearing total knee arthroplasty

Changes in in vitro compressive contact stress in the rat tibiofemoral joint with varus loading

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