Skip to main content
American College of Veterinary Surgeons Dr. Chris Wood BSc, DVM (Dist), MS
DACVS (Small Animal)

Driver-head profiles

Open original Anki image 1 of 1 for Driver-head profiles at full size
Read the draft explanation

Hexagonal, star and cruciform recesses need matching driver profiles. The star profile has six rounded lobes; the hexagonal profile has six straight sides.

The StarDrive used in Synthes LCP locking screws is reported to transmit 65% more insertional torque than a conventional hexagonal recess. Its contact faces receive force more directly, which improves torque transfer and resistance to stripping. Final tightening still follows the implant system’s torque limit. Fully seat the correct driver before turning it.

References

Johnston & Tobias, Veterinary Surgery: Small Animal, 2nd ed., ch. 41. AO Foundation, “Stardrive: a new AO screw drive connection” (2006).

↑ Back to top