Total hip arthroplasty (THA)—a total hip replacement performed through an open surgical approach—the field has made some impressive advances. As of 2026, the biggest developments are in robotics/navigation, individualized implant positioning, bearing surfaces, stability, bone preservation, and AI-assisted planning.
1. Robotic-assisted total hip replacement
Robotics is probably the most visible technological advance.
A CT scan or other imaging can be used to create a 3-D model of the patient’s hip. The surgeon then develops a preoperative plan for:
- Cup size and orientation
- Femoral stem position
- Leg length
- Femoral offset
- Hip center
- Component version
During surgery, the robotic system helps the surgeon execute that plan with greater precision.
Recent reviews find that robotic THA improves component-placement accuracy and reproducibility, although it has not consistently demonstrated better long-term patient-reported outcomes than conventional surgery.
A 2026 meta-analysis specifically looking at robotic THA through the direct anterior approach found possible reductions in reoperations, but the authors emphasized that evidence for superior patient outcomes remains limited.
2. AI-assisted surgical planning
This is one of the areas I think is particularly interesting for the future.
AI can analyze CT/X-ray data and help predict:
- Appropriate implant size
- Cup orientation
- Femoral component position
- Leg-length restoration
- Offset
- Patient-specific biomechanics
A 2026 review describes AI applications extending across the entire THA process—from preoperative planning to intraoperative execution and postoperative monitoring. AI-based 3-D templating can also reduce planning time and improve implant-size prediction.
We’re moving toward:
CT scan → AI analysis → individualized surgical plan → robotic/navigation-assisted execution.
3. Better understanding of “functional” hip positioning
Historically, surgeons often talked about placing the acetabular cup inside a generalized “safe zone.”
We’re increasingly recognizing that there isn’t one perfect cup position for every person.
A patient’s:
- Pelvic tilt
- Lumbar spine motion
- Spinal fusion
- Hip anatomy
- Activity level
- Age
can all affect how the artificial hip behaves when the person sits, stands, bends and walks.
Consequently, modern planning increasingly attempts to restore the patient’s individual biomechanics, rather than simply putting every cup at the same angle.
This is particularly important for patients with significant spine disease or previous spinal fusion.
4. Dual-mobility hip replacements
This is a major implant innovation.
A conventional hip replacement has essentially one articulation:
femoral head ↔ acetabular liner
A dual-mobility system has two articulations, allowing a larger effective head and greater jump distance.
The objective is to substantially reduce hip dislocation/instability, particularly in patients at high risk.
Modern reviews report lower dislocation rates with dual mobility, and a 2026 randomized trial specifically evaluated dual mobility in high-risk primary THA patients.
This is especially interesting for patients with:
- Previous hip replacement
- Spine fusion
- Neuromuscular disorders
- Advanced age
- Certain hip fractures
- High instability risk
5. New highly cross-linked polyethylene
The plastic bearing surface has improved enormously.
Modern highly cross-linked polyethylene has dramatically lower wear than older polyethylene. Vitamin-E-stabilized polyethylene is another development intended to improve oxidation resistance and long-term durability.
This is one reason modern hip replacements can potentially last decades, particularly when appropriately selected and implanted.
6. Modern ceramic bearings
Ceramic femoral heads have become increasingly common.
Ceramic offers:
- Very low wear
- High hardness
- Excellent scratch resistance
- Good long-term bearing characteristics
Registry data show a substantial shift toward ceramic femoral heads and ceramic-on-polyethylene combinations.
For many patients today, a ceramic head + highly cross-linked polyethylene liner is a very common modern combination.
7. Highly porous 3-D printed titanium implants
This is another fascinating development.
Some acetabular components are manufactured with highly porous titanium structures designed to encourage bone ingrowth.
The idea is essentially:
implant → bone grows into porous structure → biological fixation
rather than relying entirely on cement or mechanical fixation.
3-D printing allows engineers to create complex porous architectures that are difficult or impossible to manufacture conventionally. This is especially interesting in revision hip replacement and patients with poor bone stock.
8. Custom 3-D printed implants
For routine primary hip replacement, standardized implants still dominate.
But in difficult cases—particularly revision surgery with major bone loss—CT-based 3-D modeling can allow production of highly customized components.
The future possibility is essentially:
“Build the implant around the patient’s remaining bone.”
That’s particularly valuable when normal implants can’t achieve adequate fixation.
9. Improved femoral stems
Modern femoral stems increasingly emphasize bone preservation and individualized fit.
There are now many different stem geometries designed around different femoral anatomies, including shorter and more bone-preserving designs.
The goal is not simply to make the implant smaller; it is to achieve:
- Stable fixation
- Appropriate biomechanics
- Good load transfer
- Preservation of bone for potential future revision
10. Direct anterior approach
The direct anterior approach (DAA) has become increasingly popular.
It accesses the hip from the front and can minimize disruption of some major muscles around the hip.
Potential advantages include:
- Early mobility
- Early functional recovery
- Potentially lower early pain
- Lower early dislocation rates in some studies
But this is important: “anterior” doesn’t automatically mean “better.” Surgeon experience, patient anatomy and appropriate patient selection matter enormously.
And a highly experienced posterior-approach surgeon may provide an excellent result as well.
11. Navigation without a robot
You don’t necessarily need a robotic arm to get computer assistance.
Navigation systems can use cameras, sensors or imaging to tell the surgeon where the pelvis, femur and instruments are in 3-D space.
This can help with:
- Cup orientation
- Leg length
- Offset
- Component position
Robotics and navigation are increasingly overlapping with mixed-reality and augmented-reality technologies.
12. Augmented reality / mixed reality
This is still much more emerging than robotic THA.
The concept is that the surgeon could wear an AR headset and see virtual information superimposed on the patient’s actual anatomy.
For example:
Patient’s pelvis + virtual planned cup position + planned screw trajectory
could potentially appear together in the surgeon’s field of view.
The technology is promising, but I would currently consider it experimental/emerging rather than something that should drive a patient’s choice of surgeon.
