A Joint-Preserving Partial Shoulder Replacement
In a shoulder hemiarthroplasty, only the ball of the joint (the humeral head) is replaced. Your own socket (the glenoid) stays in place, so no plastic socket component is implanted. For some active patients with arthritis, that is an attractive middle path between living with pain and a full shoulder replacement.
Pyrocarbon is a carbon-based material whose surface properties are closer to bone than those of metal. The Tornier® Pyrocarbon Humeral Head from Stryker was the first pyrocarbon humeral head cleared by the FDA for shoulder hemiarthroplasty.1
© StrykerWhy Consider It?
In younger, high-demand patients, the plastic socket in a total shoulder replacement can wear or loosen over time, which is a concern when an implant has to last decades. A traditional metal hemiarthroplasty avoids the plastic socket, but a metal ball can wear down the native socket. Pyrocarbon is designed to be gentler on your own cartilage and bone, with the goal of preserving your socket and keeping future options open.
An honest comparison: total shoulder replacement generally gives more predictable pain relief and function. Pyrocarbon hemiarthroplasty is not for everyone; it is a considered choice for the right patient.
Pyrocarbon Hemiarthroplasty vs. Total Shoulder Replacement
| Pyrocarbon Hemiarthroplasty | Anatomic Total Shoulder | |
|---|---|---|
| What is replaced | The ball only | The ball and the socket (resurfaced with plastic) |
| Your own socket | Kept | Replaced with a plastic component |
| Best suited for | Selected, typically younger, active patients with a healthy socket and working rotator cuff | Arthritis affecting both the ball and the socket, with a working rotator cuff |
| Main trade-off | The native socket can still wear, and accurate sizing is critical | The plastic socket can wear or loosen over many years |
Who May Be a Candidate
- A healthy, working (or reconstructable) rotator cuff, which is required for this implant2
- Arthritis or avascular necrosis affecting the humeral head
- Typically younger, active patients who want to preserve their own socket
- A socket with reasonably preserved cartilage and bone, and no significant instability
If your rotator cuff has failed, a reverse or anatomic total shoulder replacement is usually the better option.
Encouraging, But Still Maturing
- In a large series of young, active patients with osteoarthritis treated with a pyrocarbon head, shoulder function improved, and socket erosion and revision were uncommon over 2 to 10 years of follow-up. Sizing mattered: oversizing the head was linked to more socket erosion and revision.3
- In a series of patients 60 and younger, 91% returned to work and 88% returned to sport.4
An honest note: pyrocarbon is a relatively new option, and long-term comparisons with total shoulder replacement are still limited. The operation is technically demanding, because accurate head sizing and soft-tissue balance are essential.5 Dr. Boubekri will tell you candidly whether it is right for your shoulder.
What to Expect After Surgery
Recovery generally resembles an anatomic shoulder replacement: a period in a sling, then guided physical therapy to restore motion and rebuild strength, with a gradual return to activity. If your shoulder changes over time, a pyrocarbon hemiarthroplasty can be converted to a total or reverse shoulder replacement.
Evaluation & Imaging
Exam, X-rays, MRI, and often a CT scan to assess your rotator cuff and socket.
Sling & Gentle Motion
Your arm is protected while the joint heals, with early guided motion as directed.
Physical Therapy
Progressive motion and strengthening; most patients resume light daily activities.
Return to Activity
Continued gains, with a gradual return to recreation as cleared by your surgeon.
As with any joint replacement, risks include infection, stiffness, instability, socket wear, nerve injury, fracture, and blood clots. Dr. Boubekri reviews these with you in detail before surgery.
Sources
- Stryker: Tornier Pyrocarbon Humeral Head
- U.S. FDA De Novo classification order, Tornier Pyrocarbon Humeral Head (DEN220012)
- Boileau P, et al. Pyrocarbon hemiarthroplasty for the treatment of shoulder osteoarthritis in young, active patients: survival and risk factors for revision. J Shoulder Elbow Surg. (PubMed)
- Short-term outcomes and survival of pyrocarbon hemiarthroplasty in the young arthritic shoulder. J Shoulder Elbow Surg.
- Healio Orthopedics: Pyrocarbon hemiarthroplasty may be effective in young, active patients
Image © Stryker, used with permission. Tornier® is a trademark of Stryker.
Frequently Asked Questions
Is pyrocarbon hemiarthroplasty the same as a total shoulder replacement?
No. It is a partial replacement. Only the ball (humeral head) is replaced, and your own shoulder socket is left in place. A total shoulder replacement also resurfaces the socket with a plastic component.
Who is it for?
It is considered for selected patients, typically younger and active, who have arthritis or avascular necrosis affecting the ball of the joint, a healthy working rotator cuff, and a socket that is still in reasonably good shape. If your rotator cuff is not working, other operations are usually a better fit.
What if my socket wears down over time?
Glenoid (socket) wear can occur after any hemiarthroplasty, and some patients eventually need another operation. In published series, patients who needed revision were generally converted to a total or reverse shoulder replacement, so the option is not a dead end.
Can I return to sports and work?
In published series of younger patients, most returned to work and many returned to recreational sports, sometimes at a lower level than before. Your own outcome depends on your shoulder, your healing, and your goals.
How is it different from a metal hemiarthroplasty?
Pyrocarbon has surface properties closer to bone than metal does, and laboratory testing suggests it causes less wear on cartilage and bone. Long-term comparisons with metal heads and with total shoulder replacement are still being collected.
This page is for general education and is not a substitute for an evaluation. Every patient is different; your recommendations will depend on your exam, imaging, and goals.