<unk> s are devices used to replace damaged<unk> s. Today, the most common use of<unk> s is in anterior cruciate<unk>  reconstruction. Although autotransplantation remains the most common method of<unk>  reconstruction, numerous materials and structures were developed to optimize the<unk>  since its creation in the World War I era. Many modern<unk> s are made of synthetic polymers, such as polyethylene terephthalate. Various coatings have been added to improve the biocompatibility of the synthetic polymers. Early<unk> s developed in the 1980s were ineffective due to material deterioration. Currently, the<unk>  Advanced Reinforcement System (LARS)<unk>  has been utilized extensively in clinical applications. Tissue engineering is a growing area of research which aims to regenerate and restore<unk>  function.
Artificial ligament
Artificial cartilage
Schilling tendon procedure
Surgical mesh
Ligature 
Hydrocollator
Triple arthrodesis
Shoe insert