Abstract
Dual-mobility cups (DMCs) were introduced in France more than 40 years ago and are
increasingly used not only in hip revision but also primary hip arthroplasty. Due
to a simulated
large-head articulation and increased jumping distance, DMCs can contribute to a high
range of motion in the hip joint and reduce the risk of instability. Numerous studies
have reported low
dislocation rates and high survival rates in the mid-term follow-up. Nevertheless,
long-term data, especially on primary hip replacement, remain limited, and the effect
of recent designs and
material innovations is still unclear. Therefore, primary DMCs are mainly proposed
in patients at high risk for dislocation (i.e. pelvitrochanteric insufficiency, compromised
spinopelvic
mobility, neuromuscular disorders, obesity and femoral neck fractures). Based on a
review of recently published studies referring to these indications, the current study
discusses the
advantages and disadvantages of DMCs.
Key words
dual mobility - tripolar cups - hip arthroplasty - dislocation - instability
