Soft layer bearing joints for spine arthroplasty

Retrieval analysis of an explanted Mobi-C cervical disc replacement: A case study

“…The ball-in-socket geometry is the most common configuration utilised for artificial cervical discs [6]. The most common material combination used is metal-on-polymer (MoP) [7]. Cervical discs that use metalon-metal (MoM) [7,8] and self-mating, all-polymer [9] articulations are also available.…”

“…The most common material combination used is metal-on-polymer (MoP) [7]. Cervical discs that use metalon-metal (MoM) [7,8] and self-mating, all-polymer [9] articulations are also available.…”

“…Anderson et al [13] investigated explanted Bryan cervical discs, after 4 to 11 months in vivo, from 11 patients. The Bryan disc had a bearing articulation formed by titanium plates and polyurethane core [7]. No inflammatory response was recorded in terms of the host response to the device and no wear was recorded from the articulation [10,13].…”

PEEK (Polyether-ether-ketone) Based Cervical Total Disc Arthroplasty: Contact Stress and Lubrication Analysis

“…For analysis the ball radius was chosen as 6.3 mm and the socket radius was chosen as 7 mm, thus giving a radial clearance of 0.7 mm. In this study the aim was to understand the effect of different radial clearances on stress and lubrication regime, so as well as a radial clearance of 0.7 mm, radial clearances of 0.05, 0.1 and 0.15 mm, which have been used by other investigators [17][18][19], were also used in the analysis. Surface roughness of the bearing surfaces was measured using a Taylorsurf-120L (Taylor Hobson Ltd., Leicester, UK) profilometer with a 2 m radius diamond stylus and an examining area of 5 5 mm.…”