Position and orientation in space of bones during movement: anatomical frame definition and determination

Cappozzo, Aurelio; Catani, Fabio; Croce, Ugo Della; Leardini, Alberto

doi:10.1016/0268-0033(95)91394-t

Cited by 1,420 publications

(966 citation statements)

References 13 publications

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“…The ionizing radiation given to the patient in our procedure is just a few hundredths of a mSv (considering a total of 22 images and an average dose of 0.001mSv for each image, we have a total dose of 0.02mSv, much lower than a 2.2mSv average dose absorbed with a CT) [30,31]. Compared to skin mounted markers, our system does not suffer from relative movements between the skin and the bone, and is thus suitable for accurate joint kinematics studies [6,7,8]. Our method proved to be stable without relying on implanted markers or joint implants, that will return more accurate results at the price of high invasiveness [5,9,11].…”

Section: Discussionmentioning

confidence: 99%

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Fluoroscopy-based tracking of femoral kinematics with statistical shape models

Valenti

Momi

et al. 2015

Int J CARS

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Abstract:Purpose Precise knee kinematics assessment helps to diagnose knee pathologies and to improve the design of customized prosthetic components. The first step in identifying knee kinematics is to assess the femoral motion in the anatomical frame. However, no work has been done on pathological femurs, whose shape can be highly different from healthy ones. Method We propose a new femoral tracking technique based on Statistical Shape Models (SSMs) and two calibrated fluoroscopic images, taken at different flexion-extension angles. The cost function optimization is based on genetic algorithms, to avoid local minima. The proposed approach was evaluated on 3 sets of digitally reconstructed radiographic images of osteoarthritic patients. Results It is found that using the estimated shape, rather than that calculated from CT, significantly reduces the pose accuracy, but still has reasonably good results (angle errors around 2 degrees, translation around 1.5mm). Cover Letter. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems CorporationThe authors thank the reviewers and the editor for their interest in this topic and for giving them the possibility to improve the paper with their comments. Hereunder we answer the questions arisen, with indications on the changes made to the manuscript According to the reviewer comment, we modified the text in the "State of the Art" section as follows:"Knee kinematics assessment has great importance both to understand the problems associated with a large number of knee pathologies and to improve the design of prosthetic components. In case of severe osteoarthritis, that are eligible for joint implant surgery, in vivo pre-operatory knee kinematics is fundamental to understand the relative motion between the three joint bones. The relative movement can give an insight of how the ligaments are stretched and their stability, and how could be the feeling for the patient. In this way, pre operatory knee kinematics could help the surgeon to decide which prosthesis should be used and how to correct the misalignment of the bones [3]. Currently, the reconstruction of the pose of the knee can be done using 3D scans such as real-time Magnetic Resonance Imaging (MRI) or through a 2D/3D registration method that superimposes the shape extracted from MRI or Computed Tomography (CT) onto an image, usually X-ray or fluoroscopy. Real-time MRI is suitable to study joint kinematics, as it evidences the muscle structure during movements. However, it can only be used with relatively slow movements, and the accuracy obtained increases from 1mm to more than 3mm depending on the velocity of the movement. In addition, MRI scans are highly expensive [4]. Traditional CT and MRI provide an accurate evaluation of the morphology of the knee, but are limited to static positioning of the patient.[…]The use of dynamic fluoroscopy to detect knee kinematics is described in [12]. The authors use a fluoroscopic system flashing at 30Hz, obtaining continuous images of the knee flexion from 0° to 120°...

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Section: Discussionmentioning

confidence: 99%

“…Skin-mounted retro-reflective markers are used in gait analysis [6,7,8] using optical localization techniques. Since this type of measurement suffers from relative motion between the skin and the bone, results are not reliable to properly investigate joint kinematics.…”

Section: Fig8 : "Exted" -> "Extend"mentioning

confidence: 99%

Fluoroscopy-based tracking of femoral kinematics with statistical shape models

Valenti

Momi

et al. 2015

Int J CARS

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“…The first method is similar to the CAST protocol that was previously described in the literature [10]. The second is the new A-Palp method.…”

Section: Methodsmentioning

confidence: 99%

“…A first protocol based on reflective markers (RMs) is used to track anatomical segment motions; RMs are attached on the skin as close as possible of the AL-of-interest (e.g., Helen-Hayes configuration or HH) [8]. The second protocol used a calibrated stick to calibrate ALs, before tracking their spatial trajectories (e.g., CAST protocol) [10]. Despite their usefulness, these two protocols show drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Precision of shoulder anatomical landmark calibration by two approaches: A CAST-like protocol and a new anatomical palpator method

et al. 2009

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“…The reference axes were created using the identified landmarks according to the method described by Cappozzo et al [5]: the origin was located at the midpoint between the malleoli (MM and LM); the vertical axis (y) was defined by the intersection of the quasifrontal plane (LM, MM, HF) and quasisagittal plane (midpoint between the malleoli, TT and orthogonal to quasifrontal plane). The z axis lay in the quasifrontal plane and the x axis was orthogonal to the yz plane ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Tibia Adaptation after Fibula Harvesting: An in Vivo Quantitative Study

Taddei

Balestri

Rimondi

et al. 2009

Clinical Orthopaedics &Amp; Related Research

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Absence of the fibula after harvesting to reconstruct an upper-limb segment increases loads on the donor-side tibia and thereby provides a unique opportunity to analyze the bone adaptation process in humans. We therefore quantified densitometric and morphologic changes of the donor-side tibia in three young patients (ages 8, 13, 16 years), on the basis of computed tomography (CT) examinations of both legs (one preoperatively and two postoperatively). The range of final followup was 27-43 months. Three-dimensional models of shank bones were generated from CT data and used to measure crosssectional area, diaphyseal cortical thickness, and crosssectional moment of inertia. In addition, density of the newly formed bone was evaluated. The donor-side tibia showed morphologic and density adaptation with time.

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Position and orientation in space of bones during movement: anatomical frame definition and determination

Cited by 1,420 publications

References 13 publications

Fluoroscopy-based tracking of femoral kinematics with statistical shape models

Fluoroscopy-based tracking of femoral kinematics with statistical shape models

Precision of shoulder anatomical landmark calibration by two approaches: A CAST-like protocol and a new anatomical palpator method

Tibia Adaptation after Fibula Harvesting: An in Vivo Quantitative Study

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