The present invention provides a replacement ligament comprising first and second ends, two or more securing portions for securing said ligament to a portion of bone material and a body portion comprising a first component having a first, higher, elongation per unit load characteristic; and a second component having a second, lower, elongation per unit load characteristic. The first and second components are between said two or more securing portions and arranged in load series such that initial, lower, loading is reacted by said first component and subsequent, higher, loading is reacted by said second component.