A Biomechanical Study of Two Kinds of Tapered Pedicle Screws in Osteoporotic Lumber Spine / 대한정형외과학회잡지
The Journal of the Korean Orthopaedic Association
;
: 955-962, 1999.
Artículo
en Coreano
| WPRIM
| ID: wpr-652021
ABSTRACT
PURPOSE:
To compare the pullout strength and insertion torque of proximally tapered screw (PT) with fully tapered screw (FT) and to investigate the correlation between the pullout strength and bone mineral density, morphology of pedicle, and insertion torque of the screw in osteoporotic lumbar spine. MATERIALS ANDMETHODS:
Fifteen osteoporotic lumbar vertebrae from four white human cadavers were used. Bone mineral density, pullout strength and insertion torque were measured by dual energy x-ray absorptiometry, MTS and torque screw driver individually.RESULTS:
The FT screw provided greater pullout force and insertion torque than the PT screw in 12 of 15 vertebrae tested (p<0.01). Pullout strength was correlated with insertion torque in PT (r=0.666, P=0.0006) and FT (r=0.464, P=0.19) screws.CONCLUSIONS:
Results of this study indicate that the FT screws provide higher pullout strength and insertion torque than PT screws in osteoporotic lumbar spine and suggest that the development of tapered minor diameter may lead to an improved pedicle screw with high pullout strength and insertion torque. Nevertheless, further study is needed to investigate the effect of tapering the minor diameter on the mechanical bending strength of the screw.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Columna Vertebral
/
Cadáver
/
Absorciometría de Fotón
/
Densidad Ósea
/
Torque
/
Vértebras Lumbares
Límite:
Humanos
Idioma:
Coreano
Revista:
The Journal of the Korean Orthopaedic Association
Año:
1999
Tipo del documento:
Artículo
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