The successful fixation of cementless implants depends on the minimization of stress and micromotion at the bone/implant interface to allow for long-term fixation via bone ingrowth. The short-term minimization of stress and micromotion can be achieved through friction between the porous structure and the bone as well as means of additional fixation such as screws, spikes or fins, for example. Although standard porous coatings such as beads or fiber mesh have demonstrated clinical success, advanced porous structures can provide enhanced friction and biological fixation that could be beneficial in more challenging cases involving compromised bone in acetabular revision arthroplasty.
For these challenging acetabular revision cases, Smith+Nephew has developed the REDAPT™ Revision Acetabular System with CONCELOC™ Advanced Porous Titanium. The REDAPT™ Fully Porous Shell is fabricated through additive manufacturing, which permits greater design flexibility compared to standard, subtractive manufacturing (i.e., machining). Smith+Nephew has leveraged this design flexibility to produce a custom, randomized porous structure similar to cancellous bone with a bone-interfacing surface with higher friction compared to beads.