Effects of Surface Topography and Chemistry on Polyether-Ether-Ketone (PEEK) and Titanium Osseointegration.

Abstract:

STUDY DESIGN:An in vivo study examining the functional osseointegration of smooth, rough, and porous surface topographies presenting polyether-ether-ketone (PEEK) or titanium surface chemistry. OBJECTIVE:To investigate the effects of surface topography and surface chemistry on implant osseointegration. SUMMARY OF BACKGROUND DATA:Interbody fusion devices have been used for decades to facilitate fusion across the disc space, yet debate continues over their optimal surface topography and chemistry. Though both factors influence osseointegration, the relative effects of each are not fully understood. METHODS:Smooth, rough, and porous implants presenting either a PEEK or titanium surface chemistry were implanted into the proximal tibial metaphyses of 36 skeletally mature male Sprague Dawley rats. At 8 weeks, animals were euthanized and bone-implant interfaces were subjected to micro-computed tomography analysis (n = 12), histology (n = 4), and biomechanical pullout testing (n = 8) to assess functional osseointegration and implant fixation. RESULTS:Micro-computed tomography analysis demonstrated that bone ingrowth was 38.9 ± 2.8% for porous PEEK and 30.7 ± 3.3% for porous titanium (P = 0.07). No differences in fixation strength were detected between porous PEEK and porous titanium despite titanium surfaces exhibiting an overall increase in bone-implant contact compared with PEEK (P < 0.01). Porous surfaces exhibited increased fixation strength compared with smooth and rough surfaces regardless of surface chemistry (P < 0.05). Across all groups both surface topography and chemistry had a significant overall effect on fixation strength (P < 0.05), but topography accounted for 65.3% of the total variance (ω = 0.65), whereas surface chemistry accounted for 5.9% (ω = 0.06). CONCLUSIONS:The effect of surface topography (specifically porosity) dominated the effect of surface chemistry in this study and could lead to further improvements in orthopedic device design. The poor osseointegration of existing smooth PEEK implants may be linked more to their smooth surface topography rather than their material composition. LEVEL OF EVIDENCE:N/A.

journal_name

Spine (Phila Pa 1976)

journal_title

Spine

authors

Torstrick FB,Lin ASP,Safranski DL,Potter D,Sulchek T,Lee CSD,Gall K,Guldberg RE

doi

10.1097/BRS.0000000000003303

subject

Has Abstract

pub_date

2020-04-15 00:00:00

pages

E417-E424

issue

8

eissn

0362-2436

issn

1528-1159

pii

00007632-202004150-00003

journal_volume

45

pub_type

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