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p=0.55. This minimal change in length did not affect the functionality and therefore all offsetadapters were functional after testing.DiscussionAlthough rare, prions pose a dangerous risk when using reusable surgical instruments.Research has been done to develop cleaning and sterilization protocols but to-date there is nogeneralized hospital procedure that includes these aggressive parameters and do not damage thesurgical instruments. Literature shows that autoclaving on a pre-vacuum setting with atemperature of 134 o C for ≥18 minutes results in a prion decrease of 5 logs. 2 In this study weincreased this temperature and kept the recommended time the same, assuming this wouldprovide similar elimination of prions.This protocol was tested on offset adapters to determine its influence on the functionality ofthis instrument. The offset adapters demonstrated that they were able to endure this aggressivetesting for simulated 10 year duration without compromising mechanical or structural integrity.References1. Brown P et al. J Infect Dis 1990;161:467-472.2. Rutala WA. et al. Clinical Infect Diseases 2001;32:1348-56.FiguresFigure 1 Figure 2Poster: 108An in-Vitro Evaluation of the Initial Stability of Cementless Pressfit HipStems Using Injectable HA Bone SubstituteIntroduction*Gregg Schmidig - Stryker Orthopaedics - mahwah, usaMayur Thakore - Stryker - Mahwah, USALaura Yanoso-Scholl - Stryker Orthopaedics - Mahwah, USA*Email: gregg.schmidig@stryker.comStability of a cementless press-fit total hip arthroplasty is essential for long-term success of theimplant. Areas of non-contact between the bone and implant (gaps) may reduce initial stabilityof the construct. We proposed the use of an injectable hydroxyapatite (HA) bone substitute toeliminate the gaps created at the bone/implant surface. Micromotion was measure for acementless hip stem implanted into a composite femur both with and without an injectable HAfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]