A novel inserter instrument (Crossbow) for installation of self-reinforced bioabsorbable arrows into meniscus tissue.

A novel inserter, Crossbow, was developed for arthroscopic installation of self-reinforced bioabsorbable meniscus arrows into meniscus tissue. The Crossbow comprises a reservoir cartridge for up to four arrows, a triggering mechanism, and an interchangeable (curved or straight) trocar for guiding and installation of an arrow. A randomized biomechanical study was carried out by installing 13-mm-long meniscus arrows into fresh porcine menisci with the Crossbow and with the standard manual inserter trocar system. The mean pull-out force for Crossbow-installed arrows was 56.8 +/- 14.2 N, and that for arrows installed with the manual system was 43.7 +/- 13.8 N; the difference was statistically significant. While Crossbow is easy and rapid to use and gives good grip of arrows into pig meniscus, it may be an attractive alternative instrument to treat bucket-handle lesions of the menisci arthroscopically.