Pelvic orientation for total hip arthroplasty in lateral decubitus: can it be accurately measured?

INTRODUCTION: During total hip arthroplasty (THA), accurately predicting acetabular cup orientation remains a key challenge, in great part because of uncertainty about pelvic orientation. This pilot study aimed to develop and validate a technique to measure pelvic orientation; establish its accuracy in the location of anatomical landmarks and subsequently; investigate if limb movement during a simulated surgical procedure alters pelvic orientation. METHODS: The developed technique measured 3-D orientation of an isolated Sawbone pelvis, it was then implemented to measure pelvic orientation in lateral decubitus with post-THA patients (n = 20) using a motion capture system. RESULTS: Orientation of the isolated Sawbone pelvis was accurately measured, demonstrated by high correlations with angular data from a coordinate measurement machine; R-squared values close to 1 for all pelvic axes. When applied to volunteer subjects, largest movements occurred about the longitudinal pelvic axis; internal and external pelvic rotation. Rotations about the anteroposterior axis, which directly affect inclination angles, showed >75% of participants had movement within ±5° of neutral, 0°. CONCLUSIONS: The technique accurately measured orientation of the isolated bony pelvis. This was not the case in a simulated theatre environment. Soft tissue landmarks were difficult to palpate repeatedly. These findings have direct clinical relevance, landmark registration in lateral decubitus is a potential source of error, contributing here to large ranges in measured movement. Surgeons must be aware that present techniques using bony landmarks to reference pelvic orientation for cup implantation, both computer-based and mechanical, may not be sufficiently accurate.

Surgical versus Ponseti approach for the management of CTEV: a comparative study.

BACKGROUND: Results from a comparative study of Ponseti versus surgical management for congenital talipes equino varus (CTEV), using historically managed patients, are presented. No bias existed in terms of management choice or participants recruited. METHODS: Twenty-three surgically treated children (31 club feet; mean age 9.1 y) and 29 treated by the Ponseti technique (42 club feet; mean age 6.5 y) agreed to participate in the study. Twenty-six typically developing children (mean age 7.9 y) were also recruited as a control group. A physical examination and 3-dimensional gait analyses were carried out on all participants, and each child and his/her parent also, independently, completed the Oxford Ankle Foot Questionnaire (OxAFQ). RESULTS: The Ponseti group underwent fewer joint-invasive procedures than the surgical group. Passive range of dorsiflexion and plantarflexion were significantly less in the CTEV groups when compared with the control group (P<0.001), and plantarflexion was also significantly less in the surgical than in the Ponseti group (P<0.05). The bimalleolar axis was found to be significantly less in the CTEV groups than in the control group (P<0.001) and also significantly less in the surgical than in the Ponseti group (P<0.05). The gait deviation index, a gait score based on kinematics, showed a more normal gait pattern in the Ponseti group compared with the surgical group (P<0.001). The CTEV groups did not differ significantly from each other in terms of ankle sagittal and transverse plane kinematics or kinetics, but foot progression angle for the Ponseti group was external, whereas that for the surgical group was internal. The Ponseti group also scored higher than the surgical group in terms of patient satisfaction, with significantly better parent-rated OxAFQ scores in the "emotional" and "school and play" domains. CONCLUSIONS: The adoption of the Ponseti technique has resulted in fewer and less-invasive operations for our CTEV population, with accompanying improvement in the overall gait pattern (gait deviation index) and parent satisfaction (OxAFQ). LEVEL OF EVIDENCE: Level III.

Cerebral embolism and thrombus in a membranous interventricular septal aneurysm.

This report describes the occurrence of a thrombus in an aneurysm of the membranous interventricular septum with cerebral embolism in a young patient. We would recommend periodic echocardiography checkups in patients with aneurysm of the membranous interventricular septum with or without a small ventricular septal defect. The findings of a mass in the aneurysm, suggestive of thrombus, may justify anticoagulation treatment or even surgical intervention.

Funcionamiento de un sistema de información epidemiológica a nivel distrital (1980) / Performance of an epidemiological information system at district level

Una guía informativa actualizada, que describe en forma exhaustiva y funcional el uso adecuado del sistema de información epidemiologica, para ser consultada de acuerdo a los requerimientos y necesidades en cualquier estado del país. Se pretende, unificar criterios, definiciones y procedimientos en la recolección, elaboración de la información que se maneja en un Servicio de Epidemiologia. Por otra parte se resalta la responsabilidad del epidemiologo distrital en las diferentes actividades, en la vigilancia, control y supervision del funcionamiento del sistema de información. Orientando y educando al medico rural, e instruyendo al equipo que labora a nivel distrital