The Effect of Screw Design on Union Rates in Scaphoid Nonunions

Wu, Ji‐Wei; Tay, Shian Chao; Shin, Alexander Y.

doi:10.1142/s0218810415500239

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Several biomechanical studies have shown that the fully threaded Acutrak screw produces higher compression forces than partially threaded smooth shaft HCSs (Assari et al, 2012; Gardner et al, 2012; Grewal et al, 2011; Hart et al, 2013). However, it has been suggested that too much compression force may affect fracture union (Wu et al, 2015). If indeed nonunion associated with Acutrak screws is associated with an increased compression force (Wu et al, 2015), it may then be acceptable to have an interfragmentary gap of 1–2 mm, such that the final compression force is within an acceptable range.…”

Section: Discussionmentioning

confidence: 99%

“…However, it has been suggested that too much compression force may affect fracture union (Wu et al, 2015). If indeed nonunion associated with Acutrak screws is associated with an increased compression force (Wu et al, 2015), it may then be acceptable to have an interfragmentary gap of 1–2 mm, such that the final compression force is within an acceptable range.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of interfragmentary gap on compression force in a headless compression screw used for scaphoid fixation

Tan

Jais

Rahim

et al. 2017

J Hand Surg Eur Vol

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We investigated the effect of an interfragmentary gap on the final compression force using the Acutrak 2 Mini headless compression screw (length 26 mm) (Acumed, Hillsboro, OR, USA). Two blocks of solid rigid polyurethane foam in a custom jig were separated by spacers of varying thickness (1.0, 1.5, 2.0 and 2.5 mm) to simulate an interfragmentary gap. The spacers were removed before full insertion of the screw and the compression force was measured when the screw was buried 2 mm below the surface of the upper block. Gaps of 1.5 mm and 2.0 mm resulted in significantly decreased compression forces, whereas there was no significant decrease in compression force with a gap of 1 mm. An interfragmentary gap of 2.5 mm did not result in any contact between blocks. We conclude that an increased interfragmentary gap leads to decreased compression force with this screw, which may have implications on fracture healing.

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