Imperial College London

ProfessorAndrewAmis

Faculty of EngineeringDepartment of Mechanical Engineering

Professor
 
 
 
//

Contact

 

+44 (0)20 7594 7062a.amis

 
 
//

Assistant

 

Ms Fabienne Laperche +44 (0)20 7594 7033

 
//

Location

 

713City and Guilds BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Athwal:2020:10.1016/j.asmr.2020.01.004,
author = {Athwal, KK and Lord, BR and Milner, PE and Gutteridge, A and Williams, A and Amis, AA},
doi = {10.1016/j.asmr.2020.01.004},
journal = {Arthroscopy and Sports Medicine Rehabilitation},
pages = {e137--e144},
title = {Redesigning metal interference screws can improve ease of insertion while maintaining fixation of soft-tissue anterior cruciate ligament reconstruction grafts},
url = {http://dx.doi.org/10.1016/j.asmr.2020.01.004},
volume = {2},
year = {2020}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Purpose: To compare the fixation strength and loads on insertion of a titanium alloy interference screw with a modified tip against a conventional titanium interference screw. Methods: Slippage of bovine digital extensor tendons (as substitutes for human tendon grafts) under cyclic loading and interference fixation strength under a pullout test were recorded in 10 cadaveric knees, with 2 tunnels drilled in each femur and tibia to provide pair-wise comparisons between the modified-tip screw (MS) and conventional screw (CS). To analyze screw insertion, 10 surgeons blindly inserted pairs of the MS and CS into bone-substitute blocks (with polyester shoelaces as graft substitutes), with insertion loads measured using a force/torque sensor. Results: No differences were found between the MS and CS either in graft slippage from the femur (P = .661) or tibia (P = .950) or in ultimate load to failure from the femur (P = .952) or tibia (P = .126). On insertion, the MS required less axial force application (78 ± 38 N, P = .001) and fewer attempted turns (2 ± 1, P < .001) to engage with the bone tunnel than the CS (99 ± 43 N and 4 ± 4, respectively). In 90% of the paired insertion tests, the screw identified by the surgeon as being easier to initially insert was the MS. Conclusions: The MS was found to be easier to engage with the bone tunnel and initially insert than the CS while still achieving similar immediate postsurgical fixation strength. Clinical Relevance: The study shows that screw designs can be improved to ease insertion into a bone tunnel, which should reduce any likelihood of ligament reconstruction graft damage.
AU - Athwal,KK
AU - Lord,BR
AU - Milner,PE
AU - Gutteridge,A
AU - Williams,A
AU - Amis,AA
DO - 10.1016/j.asmr.2020.01.004
EP - 144
PY - 2020///
SN - 2666-061X
SP - 137
TI - Redesigning metal interference screws can improve ease of insertion while maintaining fixation of soft-tissue anterior cruciate ligament reconstruction grafts
T2 - Arthroscopy and Sports Medicine Rehabilitation
UR - http://dx.doi.org/10.1016/j.asmr.2020.01.004
UR - https://www.ncbi.nlm.nih.gov/pubmed/32368750
UR - http://hdl.handle.net/10044/1/79158
VL - 2
ER -