The number of hip replacement operations performed is currently increasing due to the ageing population and the need for revision surgery after around 15 years. Improving the materials used for hip replacements would decrease the need for revision surgery and have an important economic effect as well as increasing quality of life for patients. To ensure the success and longevity of a bone implant, osteoblast cells must adhere and differentiate on the implant material to form a tight junction with the surface.