Radiographic total disc replacement angle measurement accuracy using the Oxford Cobbometer: precision and bias.

Total disc replacement (TDR) clinical success has been reported to be related to the residual motion of the operated level. Thus, accurate measurement of TDR range of motion (ROM) is of utmost importance. One commonly used tool in measuring ROM is the Oxford Cobbometer. Little is known however on its accuracy (precision and bias) in measuring TDR angles. The aim of this study was to assess the ability of the Cobbometer to accurately measure radiographic TDR angles. An anatomically accurate synthetic L4-L5 motion segment was instrumented with a CHARITE artificial disc. The TDR angle and anatomical position between L4 and L5 was fixed to prohibit motion while the motion segment was radiographically imaged in various degrees of rotation and elevation, representing a sample of possible patient placement positions. An experienced observer made ten readings of the TDR angle using the Cobbometer at each different position. The Cobbometer readings were analyzed to determine measurement accuracy at each position. Furthermore, analysis of variance was used to study rotation and elevation of the motion segment as treatment factors. Cobbometer TDR angle measurements were most accurate (highest precision and lowest bias) at the centered position (95.5%), which placed the TDR directly inline with the x-ray beam source without any rotation. In contrast, the lowest accuracy (75.2%) was observed in the most rotated and off-centered view. A difference as high as 4 degrees between readings at any individual position, and as high as 6 degrees between all the positions was observed. Furthermore, the Cobbometer was unable to detect the expected trend in TDR angle projection with changing position. Although the Cobbometer has been reported to be reliable in different clinical applications, it lacks the needed accuracy to measure TDR angles and ROM. More accurate ROM measurement methods need to be developed to help surgeons and researchers assess radiological success of TDRs.

Tres nous fragments d'inscripció en bronze en col·leccions particulars

Presentació de tres bronzes de caràcter jurídic procedents un d'ells d'Hellin i els altres probablement de la Bètica. El primer sembla ésser una limitatio o una adsignatio. El segon sembla correspondre a un passatge d'una llei d'època flàvia, i el tercer és, probablement, una adsignatio.

Una reflexión sobre la impronta romana del 'beneficio de separación de patrimonios' en el Código Civil catalán

The roman institution of the separatio bonorum is a pretorian remedy that relies on the principle of equity, created as to protect the deceased creditors and/or legatees. It provides them a"benefit" in the case of selling the goods of the heir-deubtor, enabling them to separate and reserve for themselves that whole patrimonium, as to avoid that by the act of selling, the heirs creditors could go to it; and like this they maintain intact their guarantee, which relies on the whole goods and assets left by the deceased. The separation of patrimonies implied the existence of 2 different groups of goods: that of the heirs" and that one of the deceased, which are not the same in legal terms, in spite of having a common owner at this point, the heir. This institution was regulated in the 6th title of the 42nd book of the Digesto, and in the 72th title, 7th book of the Justinean Code, and its interest is really high due to its material complexity and its procedure. The aim of this work is to analyze the institution of the separatio bonorum in Roman Law, and its importance in the same figure, actually regulated in the 4th book of the Catalan civil code.

La Novela 53, 6 y sus precedentes inmediatos

Por ser la cuarta vidual, como corroboran las Nov. 53, 6; 74, 5 y 117, 5, una figura vinculada tanto al Derecho de familia, en concreto, a la denominada, en doctrina, cuarta marital o uxoria en su acepción penal, pues en ésta encuentra una parte importante de sus raíces, como al Derecho sucesorio; su historia y fines se entenderán mejor si se integra en la evolución de ambos sistemas. Lo dicho justifica, a mi juicio, el interés de un estudio que, como éste, se centre, por una parte, en la institución que fue el precedente histórico inmediato de la cuarta vidual y, por otra, en el análisis de la Novela que, por primera vez, reguló el derecho a la cuarta en favor del cónyuge viudo, esto es, la 53, 6.

Machine learning for spatial environmental data. Theory, applications and software

The book presents the state of the art in machine learning algorithms (artificial neural networks of different architectures, support vector machines, etc.) as applied to the classification and mapping of spatially distributed environmental data. Basic geostatistical algorithms are presented as well. New trends in machine learning and their application to spatial data are given, and real case studies based on environmental and pollution data are carried out. The book provides a CD-ROM with the Machine Learning Office software, including sample sets of data, that will allow both students and researchers to put the concepts rapidly to practice.

Outcome evaluation of ankle osteoarthritis treatments using spatio-temporal gait parameters and plantar pressure during unconstrained long distance walking : P25

Introduction: Ankle arthrodesis (AD) and total ankle replacement (TAR) are typical treatments for ankle osteoarthritis (AO). Despite clinical interest, there is a lack of their outcome evaluation using objective criteria. Gait analysis and plantar pressure assessment are appropriate to detect pathologies in orthopaedics but they are mostly used in lab with few gait cycles. In this study, we propose an ambulatory device based on inertial and plantar pressure sensors to compare the gait during long-distance trials between healthy subjects (H) and patients with AO or treated by AD and TAR. Methods: Our study included four groups: 11 patients with AO, 9 treated by TAR, 7 treated by AD and 6 control subjects. An ambulatory system (Physilog®, CH) was used for gait analysis; plantar pressure measurements were done using a portable insole (Pedar®-X, DE). The subjects were asked to walk 50 meters in two trials. Mean value and coefficient of variation of spatio-temporal gait parameters were calculated for each trial. Pressure distribution was analyzed in ten subregions of foot. All parameters were compared among the four groups using multi-level model-based statistical analysis. Results: Significant difference (p <0.05) with control was noticed for AO patients in maximum force in medial hindfoot and forefoot and in central forefoot. These differences were no longer significant in TAR and AD groups. Cadence and speed of all pathologic groups showed significant difference with control. Both treatments showed a significant improvement in double support and stance. TAR decreased variability in speed, stride length and knee ROM. Conclusions: In spite of a small sample size, this study showed that ankle function after AO treatments can be evaluated objectively based on plantar pressure and spatio-temporal gait parameters measured during unconstrained walking outside the lab. The combination of these two ambulatory techniques provides a promising way to evaluate foot function in clinics.

Constitutio scimus: el heredero después de la confección del inventario

Sumario: 1. Introducción. 2. Posición particular del heredero beneficiado respecto del caudal relicto: examen de sus derechos o privilegios. 3. Relaciones del heredero beneficiado con los acreedores de la herencia, legatarios y fideicomisarios

Elaboració d"una base de dades per a l"autoformació i autoavaluació de coneixements i competències en estudis científics superiors

L'objectiu principal és oferir uns recursos educatius multimèdia (en format HTML i JAVA) utilitzables en línea (Internet) o en suport autònom (CD-ROM) per a l'autoformació i l'autoevaluació ...

A new ambulatory system for comparative evaluation of the three-dimensional knee kinematics, applied to anterior cruciate ligament injuries

The aim of this study was to develop an ambulatory system for the three-dimensional (3D) knee kinematics evaluation, which can be used outside a laboratory during long-term monitoring. In order to show the efficacy of this ambulatory system, knee function was analysed using this system, after an anterior cruciate ligament (ACL) lesion, and after reconstructive surgery. The proposed system was composed of two 3D gyroscopes, fixed on the shank and on the thigh, and a portable data logger for signal recording. The measured parameters were the 3D mean range of motion (ROM) and the healthy knee was used as control. The precision of this system was first assessed using an ultrasound reference system. The repeatability was also estimated. A clinical study was then performed on five unilateral ACL-deficient men (range: 19-36 years) prior to, and a year after the surgery. The patients were evaluated with the IKDC score and the kinematics measurements were carried out on a 30 m walking trial. The precision in comparison with the reference system was 4.4 degrees , 2.7 degrees and 4.2 degrees for flexion-extension, internal-external rotation, and abduction-adduction, respectively. The repeatability of the results for the three directions was 0.8 degrees , 0.7 degrees and 1.8 degrees . The averaged ROM of the five patients' healthy knee were 70.1 degrees (standard deviation (SD) 5.8 degrees), 24.0 degrees (SD 3.0 degrees) and 12.0 degrees (SD 6.3 degrees for flexion-extension, internal-external rotation and abduction-adduction before surgery, and 76.5 degrees (SD 4.1 degrees), 21.7 degrees (SD 4.9 degrees) and 10.2 degrees (SD 4.6 degrees) 1 year following the reconstruction. The results for the pathologic knee were 64.5 degrees (SD 6.9 degrees), 20.6 degrees (SD 4.0 degrees) and 19.7 degrees (8.2 degrees) during the first evaluation, and 72.3 degrees (SD 2.4 degrees), 25.8 degrees (SD 6.4 degrees) and 12.4 degrees (SD 2.3 degrees) during the second one. The performance of the system enabled us to detect knee function modifications in the sagittal and transverse plane. Prior to the reconstruction, the ROM of the injured knee was lower in flexion-extension and internal-external rotation in comparison with the controlateral knee. One year after the surgery, four patients were classified normal (A) and one almost normal (B), according to the IKDC score, and changes in the kinematics of the five patients remained: lower flexion-extension ROM and higher internal-external rotation ROM in comparison with the controlateral knee. The 3D kinematics was changed after an ACL lesion and remained altered one year after the surgery

El trono preparado: reflexiones sobre estética, cultura visual e imagen simbólica en el arte tardoantiguo y su proyección en la Hispania visigoda y al-Andalus

Ensayo sobre las placas-nicho visigodas y el mihrab y macsura de la mezquita de Córdoba centrado en sus aspectos formales e iconológicos y sus referentes en la arquitectura de poder y la representación simbólica de la divinidad.

Obispos y gladiadores: El recurso a los profesionales del anfiteatro en disputas por la elección episcopal.

[spa]La costumbre de enrolar a combatientes del anfiteatro (arenarii) como guardia personal en el marco de luchas faccionales sobrevivió durante el siglo IV. Incluso si en la mayor parte de casos este fenómeno se explica por razones políticas, conocemos dos ejemplos en los que los candidatos a obispo recurrieron a gladiadores para triunfar sobre sus oponentes. El primer ejemplo está relacionado con la elección de Silvano (en el 305 o en el 307/308), quien llegó a hacerse elegir obispo de Cirta (actual Constantine)gracias a la ayuda del arenarius Muto. Esta ayuda quedó bien demostrada por el testimonio de diversas personas durante el proceso seguido contra Silvano en el 320, en el que se reconoció su culpabilidad y se le condenó al exilio. El segundo ejemplo es el del papa Dámaso (366), elegido obispo de Roma en la iglesia de Lucina el mismo día en el que el diácono Ursino era escogido en la basílica de Julio. En el conflicto siguiente, Dámaso convocó a arenarii, quadrigari y fossores, quienes acudieron en su ayuda fuertemente armados. Éstos atacaron la basílica en la que se habían refugiado los partidarios de Ursino y el resultado del asalto fue de 137 muertos. [eng]The habit of engaging fighters of the amphitheatre (arenarii) as a personal guard in the factional struggles survived during the 4th century. Although in most cases it was about political causes, we know two examples where the candidates to be bishops turned to gladiators in order to overcome their opponents. The first example is that of election of Silvanus (305 or 307-308), who got the bishopric of Cirta (the modern Constantine) thanks to the help of the arenarius Mutus. This help was proved by the testimony of several witnesses during the trial which was followed against Silvanus in 320, where his guilt was admitted and he was condemned to the exile. The second exemple is that of the the Pope Damasus (366), elected bishop of Rome in the church of Lucina in the same day as the deacon Ursinus was elected in the basilica of Julius. In the conflict that was to follow, Damasus called arenarii, quadrigarii and fossores who came to help him heavily armed. They attacked the basilica where the supporters of Ursinus had taken refuge and as a result of the assault 137 people died.