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Research Background
Lung growth is limited to the anatomical boundaries
of the thorax, which consists of the spine, the chondral and osseous ribs, and
the sternum. The spine and ribs work together efficiently at respiration as a
dynamic biomechanical structure only under specific conditions. When the thorax is affected by significant
deformity, the dynamics of this system change interfering with normal
respiration and lung development. Thoracic insufficiency syndrome (TIS) has been defined as the inability
of the thorax to support normal respiration and/or lung growth. This condition occurs in patients with
congenital, infantile or neuromuscular scoliosis, congenital anomalies of the
ribs, acquired chest wall deformities, and some skeletal dysplasias.
Severely compromised respiratory function in the growing child is associated
with frequent respiratory infections and failure to thrive. Many of these children go on to develop
significant thoracic hypoplasia, restrictive lung disease, and respiratory
insufficiency by early adulthood. The
purpose of our in-vivo experimental studies is to investigate the
relationship between growth of the thoracic spine and growth of the rib cage
under conditions that create symmetrical or asymmetrical growth disturbances of either the spine or rib cage in a growing rabbit and the
effect of these growth disturbances on pulmonary function. Additionally, we are also investigating how
implantation of an interventional device which distracts and expands the chest
wall affects total lung function in scoliotic subjects and its effect on alveolar histomorphometry.
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Publications and Presentations
Mehta HP, B Snyder, A
Jackson
, S Baldassarri, M
Hayward
,
M Giuffrida, V Entezari, J
Wilson. How
does VEPTR affect pulmonary function? An in vivo assessment using the rabbit scoliosis model. Selected for oral presentation at the 1st International Congress on Early Onset Scoliosis and Growing Spine,
Madrid
,
Spain
,
November 2007. Awarded Best Paper honor
at conference.
Mehta, HP, B Snyder,
N Callender
, C Bellardine, A Jackson. The
reciprocal relationship between thoracic and spinal deformity and its effect on
pulmonary function in a rabbit model: a pilot study. Spine. 2006 Nov 1; 31(23): 2654-64.
Mehta, HP, B Snyder, E
Sun, A Jackson, C Bellardine,
K Lutchen. Reciprocal
relationship between thoracic and spinal deformity and its effect on pulmonary
function. Selected for oral presentation at the 51st Annual Meeting of the Orthopaedic Research Society,
Washington
,
D.C.
, February 2005.
Mehta, HP, B Snyder, E Sun, A Jackson. Relationship
between thoracic cage and spine deformity in rabbits with experimental
scoliosis. Selected for oral presentation at the 39th Annual Meeting of the Scoliosis Research Society,
Buenos Aires
,
Argentina
, September 2004. |