title: Validation of an optical system to measure acetabular shell deformation in cadavers.
abstract: Deformation of the acetabular shell at the time of surgery can result in poor performance and early failure of the hip replacement. The study aim was to validate an ATOS III Triple Scan optical measurement system against a co-ordinate measuring machine using in vitro testing and to check repeatability under cadaver laboratory conditions. Two sizes of custom-made acetabular shells were deformed using a uniaxial/two-point loading frame and measured at different loads. Roundness measurements were performed using both the ATOS III Triple Scan optical system and a co-ordinate measuring machine and then compared. The repeatability was also tested by measuring shells pre- and post-insertion in a cadaver laboratory multiple times. The in vitro comparison with the co-ordinate measuring machine demonstrated a maximum difference of 5 µm at the rim and 9 µm at the measurement closest to the pole of the shell. Maximum repeatability was below 1 µm for the co-ordinate measuring machine and 3 µm for the ATOS III Triple Scan optical system. Repeatability was comparable between the pre-insertion (below 2 µm) and post-insertion (below 3 µm) measurements in the cadaver laboratory. This study supports the view that the ATOS III Triple Scan optical system fulfils the necessary requirements to accurately measure shell deformation in cadavers.
authors.affiliation: Medical Products Division, CeramTec GmbH, Plochingen, Germany p.dold@ceramtec.de.
authors.forename: Philipp
authors.initials: P
authors.lastname: Dold
authors.affiliation: School of Mechanical Engineering, Newcastle University, Newcastle upon Tyne, UK.
authors.forename: Martin C
authors.initials: MC
authors.lastname: Bone
authors.affiliation: Medical Products Division, CeramTec GmbH, Plochingen, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Flohr
authors.affiliation: Medical Products Division, CeramTec GmbH, Plochingen, Germany.
authors.forename: Roman
authors.initials: R
authors.lastname: Preuss
authors.affiliation: School of Mechanical Engineering, Newcastle University, Newcastle upon Tyne, UK.
authors.forename: Tom J
authors.initials: TJ
authors.lastname: Joyce
authors.affiliation: Newcastle Surgical Training Centre, Freeman Hospital, Newcastle upon Tyne, UK.
authors.forename: David
authors.initials: D
authors.lastname: Deehan
authors.affiliation: Newcastle Surgical Training Centre, Freeman Hospital, Newcastle upon Tyne, UK.
authors.forename: James
authors.initials: J
authors.lastname: Holland
mesh_terms: D000077:Acetabulum; D002102:Cadaver; D019544:Equipment Failure Analysis / Q000379:methods*; D006622:Hip Prosthesis; D006801:Humans; D061848:Optical Imaging / Q000379:methods*; D011474:Prosthesis Design; D011475:Prosthesis Failure
keywords: Acetabular shell deformation; cadaver; hip prostheses; optical measuring system; validation