interposition and augmentation devices for tendon and ligament repair , including rotator cuff repair , have been developed as well as methods for their delivery using arthroscopic methods . the devices are preferably derived from biocompatible polyhydroxyalkanoates , and preferably from copolymers or homopolymers of 4 - hydroxybutyrate . the devices may be delivered arthroscopically , and offer additional benefits such as support for the surgical repair , high initial strength , prolonged strength retention in vivo , flexibility , anti - adhesion properties , improved biocompatibility , an ability to remodel in vivo to healthy tissue , minimal risk for disease transmission or to potentiate infection , options for fixation including sufficiently high strength to prevent suture pull out or other detachment of the implanted device , eventual absorption eliminating future risk of foreign body reactions or interference with subsequent procedures , competitive cost , and long - term mechanical stability . the devices are also particularly suitable for use in pediatric populations where their eventual absorption should not hinder growth .