Presiones intracapsulares después de un deslizamiento estable de la cabeza femoral / Intracapsular Pressures After Stable Slipped Capital Femoral Epiphysis

#CapitalFemoralEpiphysis

Fuente
Este artículo es originalmente publicado en:
http://www.ncbi.nlm.nih.gov/pubmed/25812147
http://journals.lww.com/pedorthopaedics/pages/articleviewer.aspx?year=9000&issue=00000&article=99597&type=abstract
De:
Crepeau A¹, Birnbaum M, Vander Have K, Herrera-Soto J.
J Pediatr Orthop. 2015 Mar 24. [Epub ahead of print]
Todos los derechos reservados para:
Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.

Abstract

PURPOSE:

Stable slipped capital femoral epiphysis (SCFE) has been shown to have a lower rate of avascular necrosis than unstable SCFE. A recent study found increased intracapsular hip pressures in the setting of unstable SCFE, thus increasing the risk of osteonecrosis. The purpose of this study was to measure the intracapsular pressure in stable SCFE and compare it to the intracapsular pressure in normal hips and in unstable SCFE.

METHODS:

Thirteen hips with stable SCFE and 15 hips with unstable SCFE were identified. Using a side-bored needle, intracapsular hip pressures were measured at the time of surgery. Within these 2 study groups, 11 unaffected (normal) hips were also measured. Diastolic blood pressure and mean arterial pressure at the time of measurement were also recorded.

RESULTS:

The average intracapsular hip pressure in the stable SCFE group was 27.0 mm Hg, whereas the average pressure in the unstable SCFE group was 48.2 mm Hg and the average pressure in the normal group was 21.8 mm Hg. There was no significant difference between the normal and stable SCFE groups. There was a statistically significant difference between the stable SCFE and unstable SCFE groups (P<0.001). We found similar trends when comparing the intracapsular hip pressure as a percentage of the mean arterial pressure as well as the difference between diastolic blood pressure and hip pressure.

CONCLUSIONS:

As expected, the intracapsular pressure in the setting of stable SCFE approaches that of normal hips. This may explain why the risk of AVN in stable SCFE is significantly lower than that of unstable SCFE. It also supports the idea that capsulotomy is indicated for unstable slips to decrease the elevated hip pressure but not in stable SCFE.

PROPOSITO:

Un estable deslizamiento de la cabeza femoral (DCF) se ha demostrado que tienen una menor tasa de necrosis avascular que un DCF inestable. Un estudio reciente encontró aumentó las presiones intracapsular de cadera en el establecimiento de un DCF inestable, lo que aumenta el riesgo de osteonecrosis. El propósito de este estudio fue medir la presión intracapsular en DCF estable y compararla con la presión intracapsular en caderas normales y en DCF inestable.

 CONCLUSIONES:

Como era de esperar, la presión intracapsular en la fijación de DCF estable aproxima a la de las caderas normales. Esto puede explicar por qué el riesgo de AVN en DCF estable es significativamente menor que la de DCF inestable. También es compatible con la idea de que la capsulotomía está indicado para deslices inestables para disminuir la presión de la cadera elevada pero no en DCF estable.

LEVEL OF EVIDENCE:

Level III.