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BMC Musculoskelet Disord. 2017 Jul 28;18(1):322. doi: 10.1186/s12891-017-1683-1.

The effect of different screw-rod design on the anti-rotational torque: a biomechanical comparison of three conventional screw-rod constructs.

Author information

1
Department of Orthopaedics, The 1st Affiliated Hospital of Sun Yat-sen University, NO.58, Zhongshan Er Road, Guangzhou, Guangdong, China.
2
Department of Orthopaedics, The 1st Affiliated Hospital of Sun Yat-sen University, NO.58, Zhongshan Er Road, Guangzhou, Guangdong, China. yjunlin@126.com.

Abstract

BACKGROUND:

Screw-rod constructs have been widely used to correct spinal deformities, but the effects of different screw-rod systems on anti-rotational torque have not been determined. This study aimed to analyze the biomechanical effect of different rod-screw constructs on anti-rotational torque.

METHODS:

Three conventional spinal screw-rod systems (Legacy, RF-F-10 and USSII) were used to test the anti-rotational torque in the material test machine. ANOVA was performed to evaluate the anti-rotational capacity of different pedicle screws-rod constructs.

RESULTS:

The anti-rotational torque of Legacy group, RF-F-10 group and USSII group were 12.3 ± 1.9 Nm, 6.8 ± 0.4 Nm, and 3.9 ± 0.8 Nm, with a P value lower than 0.05. This results indicated that the Legacy screws-rod construct could provide a highest anti-rotation capacity, which is 68% and 210% greater than RF-F-10 screw-rod construct and USSII screw-rod respectively.

CONCLUSIONS:

The anti-rotational torque may be mainly affected by screw cap and groove design. Our result showed the anti-rotational torque are: Legacy system > RF-F-10 system > USSII system, suggesting that appropriate rod-screw constructs selection in surgery may be vital for anti-rotational torque improvement and preventing derotation correction loss.

KEYWORDS:

Anti-rotational torque; Biomechanics; Rod-screw construct

PMID:
28754114
PMCID:
PMC5534095
DOI:
10.1186/s12891-017-1683-1
[Indexed for MEDLINE]
Free PMC Article

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