Surface movement errors in shank kinematics and knee kinetics during gait

Holden, John P.; Orsini, John A.; Siegel, Karen Lohmann; Kepple, Thomas M.; Gerber, Lynn H.; Stanhope, Steven J.

doi:10.1016/s0966-6362(96)01088-0

Cited by 151 publications

(106 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…30,31 The placement of the receivers in the current study was on the lateral side at onethird of the segment length from the distal end, where it would be less affected by soft tissue movement. [29][30][31][32] Several studies have also advised caution in interpreting the data in the transverse and frontal planes at the knee joint, as these are prone to greater inaccuracies due to soft tissue artefact than in the flexion-extension plane. [29][30][31][32] In the current study, rotation and abduction-adduction angles must also be considered subject to greater error than angles in the sagittal plane.…”

Section: Discussionmentioning

confidence: 99%

“…[29][30][31][32] Several studies have also advised caution in interpreting the data in the transverse and frontal planes at the knee joint, as these are prone to greater inaccuracies due to soft tissue artefact than in the flexion-extension plane. [29][30][31][32] In the current study, rotation and abduction-adduction angles must also be considered subject to greater error than angles in the sagittal plane. However, most subjects had little excess soft tissue as indicated by their low mean body mass index (22.7 kg/m 2 ).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Hip, knee, and ankle kinematics of high range of motion activities of daily living

et al. 2006

View full text Add to dashboard Cite

Treatment of joint disease that results in limited flexion is often rejected by patients in non-Western cultures whose activities of daily living require a higher range of motion at the hip, knee, or ankle. However, limited information is available about the joint kinematics required for high range of motion activities, such as squatting, kneeling, and sitting cross-legged, making it difficult to design prosthetic implants that will meet the needs of these populations. Therefore, the objective of this work was to generate three-dimensional kinematics at the hip, knee, and ankle joints of Indian subjects while performing activities of daily living. Thirty healthy Indian subjects (average age: 48.2 AE 7.6 years) were asked to perform six trials of the following activities: squatting, kneeling, and sitting cross-legged. Floating axis angles were calculated at the joints using the kinematic data collected by an electromagnetic motion tracking device with receivers located on the subject's foot, shank, thigh, and sacrum. A mean maximum flexion of 1578 AE 68 at the knee joint was required for squatting with heels up. Mean maximum hip flexion angles reached up to 958 AE 278 for squatting with heels flat. The high standard deviation associated with this activity underscored the large range in maximum hip flexion angles required by different subjects. Mean ankle range of flexion reached 588 AE 148 for the sitting cross-legged activity. The ranges of motion required to perform the activities studied are greater than that provided by most currently available joint prostheses, demonstrating the need for high range of motion implant design. ß

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Hip, knee, and ankle kinematics of high range of motion activities of daily living

et al. 2006

View full text Add to dashboard Cite

show abstract

“…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%

“…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

View full text Add to dashboard Cite

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°...

show abstract

“…4 Vicon (Vicon Motion Systems Ltd., UK) típu-sú rendszerek esetében a három tényező hatása jól dokumentált. [5][6][7] 1. ábra. a) marker; b) 3 marker integrációja egy markercsoport objektummá termined.…”

Section: Bevezetésunclassified

Investigation of calibration accuracy of anatomical landmarks in an optical motion analysis method

Rácz¹,

Pálya²,

Takács³

et al. 2018

Biomech Hung

View full text Add to dashboard Cite

AbsztraktA biomechanikai mozgásvizsgálatok egyik alapeszközei az optikai-alapú mozgásrögzítő eszkö-zök. A technológia fejlődésével egyre nő az igény a pontosabb, kompaktabb és olcsóbb rendszerek iránt. Jelen kutatás fő célja egy OptiTrack (NaturalPoint, Corvallis, OR, USA) rendszert alkalmazó, markercsoport mozgáskövetésen és kalibráción alapuló mozgásvizsgáló módszer pontosságá-nak anatómiai pontok kijelölésére vonatkozó aspektusának vizsgálata. A vizsgáltban 8 személy vett részt (kor: 40,8±28,8 év, tömeg: 69,4±18,1 kg, magasság: 168,1±14,8 cm), akiken két, eltérő háttérrel (orvosi, illetve műszaki) rendelkező vizsgáló végzett kalibrációkat. A mérési eredmé-nyekből az egyes vizsgálók pontosságára jellemző intraobserver hibák, illetve a vizsgálók közötti eltérésekre jellemző interobserver hibák lettek kiszámítva. A rendszer megfelelően pontosnak bizonyult, az átlagos intraobserver hiba 4,29 mm és 8,22 mm közötti, de egyes helyeken csupán 2-3 mm körüli érték. A műszaki tapasztalattal rendelkező vizsgáló átlagos kalibrációs hibája minden résztvevő esetén alacsonyabb, mint az orvosi hátérrel rendelkezőé. Nincs statisztikailag kimutatható kapcsolat a kalibrálások pontossága, és a résztvevők antropometriai tulajdonságai között (kor, magasság, testsúly, testtömeg-index). Az interobserver hibák a vártnál jelentősen nagyobbnak bizonyultak, 11,67 mm és 20,87 mm közötti résztvevőnkénti átlagos, és 65,35 mm maximális értékkel. Ezek az eltérések a különböző vizsgálók által végzett méréseket összehasonlíthatatlan-ná teszik. Az itt talált eredményeket a mérőrendszer és protokoll további fejelesztésénél érdemes szem előtt tartani.Kulcsszavak: mozgásvizsgálat, járásvizsgálat, OptiTrack, kalibráció, anatómiai pont kijelölés, pontosság Investigation of calibration accuracy of anatomical landmarks in an optical motion analysis method AbstractOptical motion capture systems are one of the basic tools of biomechanical motion analyses. With the technological developments, demand for cheaper, more compact and accurate systems are on the rise. The main goal of the present study is to determine the accuracy of anatomical landmark placement in a new motion analysis method that uses marker-cluster tracking, a calibration technique, and an OptiTrack (NaturalPoint, Corvallis, OR, USA) motion capture system. Eight subjects (age: 40.8±28.8 years, mass: 69.4±18.1 kg, height: 168.1±14.8 cm) were measured by two examiners with different practical backgrounds (one with medical, and one with technological knowledge). From the measurement results, intra-examiner errors, illustrative of the examiners accuracy, and inter-examiner errors, illustrative of the differences between examiners were de-

show abstract

Surface movement errors in shank kinematics and knee kinetics during gait

Cited by 151 publications

References 10 publications

Hip, knee, and ankle kinematics of high range of motion activities of daily living

Hip, knee, and ankle kinematics of high range of motion activities of daily living

Fluoroscopy-based tracking of femoral kinematics with statistical shape models

Investigation of calibration accuracy of anatomical landmarks in an optical motion analysis method

Contact Info

Product

Resources

About