Direct Anterior Approach Reduces Dislocation Risk in Head and Liner Exchange

Isolated head and liner exchange (a procedure where only the modular components are replaced while well-fixed acetabular and femoral stems are retained) serves as a less invasive revision strategy for patients with polyethylene wear, offering reduced surgical morbidity and faster recovery compared to full component revision [1]. However, postoperative instability remains the most frequent complication, often necessitating the use of larger femoral heads, elevated liners, or dual mobility constructs (implants featuring a second mobile bearing surface to increase the jump distance) to maintain joint integrity [2, 3]. While these specialized implants can reduce dislocation risk, they may also introduce concerns regarding long-term wear debris or mechanical failure [4, 5]. The choice of surgical approach in the revision setting is increasingly scrutinized, as surgeons seek techniques that preserve soft tissue tension and optimize component orientation, particularly because acetabular cups with more than 48 degrees of abduction are 2.6 times more likely to dislocate [6]. A recent retrospective study of 176 cases now evaluates how the direct anterior approach (a muscle-sparing technique that accesses the joint through the interval between the tensor fasciae latae and the sartorius) compares to traditional methods in preventing these early mechanical failures [3].