Medpor Motility Coupling Post: a rabbit model.
OBJECTIVE
To verify if a Medpor porous polyethylene orbital implant (PPOI) (Porex Surgical, Atlanta, GA, U.S.A.), once vascularized, will tolerate a partially exposed titanium screw on its anterior surface.


METHODS
Ten New Zealand white rabbits were enucleated and given Medpor PPOIs. Eight weeks postoperatively, Medpor Motility Coupling Posts (MCPs) (Porex Surgical) were placed into the orbital implants. Clinical tissue tolerance and histologic response to the new device were noted.


RESULTS
The titanium screws were well tolerated by the animals. No case of post-operative infection, conjunctival inflammation, conjunctival erosion, MCP dislocation, or PPOI fragmentation was noted. A fibrous tissue growth over the titanium head was noted in all screws with a head height of 2.5 mm. The fibrous tissue overgrowth was not observed in screws with a head height of 4 mm or more.


CONCLUSIONS
During the 6-month observation period, all implanted Medpor MCPs demonstrated favorable tissue tolerance and stable interfaces between the MCP and the conjunctiva and between the MCP and the PPOI.
Choi
J C
JC
Limberg Eye Surgery, San Luis Obispo, California, USA.
Iwamoto
M A
MA
Bstandig
S
S
Rubin
P A
PA
Shore
J W
JW
D000818:Animals; D001672:Biocompatible Materials; D001863:Bone Screws; D015353:Eye Enucleation; D005137:Eye, Artificial; D016268:Internal Fixators; D020273:Orbital Implants; D016348:Osseointegration; D011095:Polyethylenes; D019919:Prosthesis Implantation; D011817:Rabbits; D014025:Titanium
D001672:Biocompatible Materials; D011095:Polyethylenes; D014025:Titanium