SummarySoft tissue adhesion to the porous polyethylene sheet implant (PPSI) raises the concern of postoperative extraocular motility disturbance after orbital blowout fracture repairs using PPSI. A PPSI with a barrier surface (PPSI-B) has been developed to reduce adhesion between soft tissue and the implant. Six PPSI-B and six conventional PPSI were implanted under the scalps of three New Zealand white rabbits. The implants were harvested at 2-, 4-, and 20-week intervals. Clinical and histologie comparisons were made between PPSI-B and PPSI with regard to adhesion at the soft tissue—implant interface. Clinically, PPSI-B demonstrated less adhesion between soft tissue and implant compared with the conventional PPSI. Both types of implants demonstrated a complete fibrovascular ingrowth by 2 weeks. Because PPSI-B causes less adhesion at the soft tissue-implant interface, consideration should be given to the use of PPSI-B in repairs of orbital blowout fractures in which extraocular muscle is exposed to the implant surface.SUMMARYOur study supports the efficacy of PPSI-B in reducing soft tissue adhesion without compromising the degree of fibrovascular ingrowth into the implant. The PPSI-B may be especially useful in cases in which the extraocular muscle is exposed to the porous polyethylene implant. However, the reduction of adhesiveness to soft tissue and the resultant improvement in handling characteristics support the use of PPSI-B in all orbital reconstructive surgeries.