Mako systems

Goals of total hip arthroplasty (THA)

Surgeons perform THA on patients with the goals of:

  • Pain relief3
  • Enhancing joint stability4
  • Providing greater range of motion4
  • Restoring leg length3
  • Restoring offset3

Today, dislocation and leg length discrepancy are much less accepted by patients. It is time to redefine hip arthroplasty, by shifting the balance towards solutions that provide more natural biomechanics.”

-Professor Rudolph Geesink, MD, PhD

Total hip clinical considerations

Leg length discrepancy (LLD)

While a small percentage of hips are revised for leg length discrepancy as noted in the 2014 AOA Joint Registry,5 a clinical study reported 29% of their patients having a postoperative leg length discrepancy greater than 1cm versus the contralateral hip6

Malpositioned components7

Many reasons for revision can be linked to malpositioned acetabular components including:

  • Dislocation
  • Impingement
  • Component wear-potentially leading to osteolysis and aseptic loosening of the joint
  • Liner fracture
Mako systems

Risk factors for cup malpositioning7

  • Clinical study - Massachusetts General Hospital
  • 1,823 hips
  • Acceptable cup placement:
    • Inclination: 30-45°
    • Anteversion: 5-25°
  • Study found that the acetabular cup was placed in the acceptable safe range only 50% of the time.
Mako systems