Thumb arthritis, also called rhizarthrosis, can make daily tasks hard. You may wonder about options to help. One option is trapeziometacarpal prostheses (TMP). How well do they work? A recent study gives new details about big problems and what happens if a TMP fails.
Here are three key points from the study:
- Dislocation and loosening are the most common problems with these implants.
- Not all TMP models last the same over time.
- Careful placement and how the implant is designed help long-term success.
- What are trapeziometacarpal prostheses?
- How well do they work?
- What are the common complications?
- What questions do patients ask about TMP?
- What should I do next about trapeziometacarpal prostheses?
- What is this disclaimer?
- Where can I find the full article citation?
What are trapeziometacarpal prostheses?
Trapeziometacarpal prostheses, or TMPs, are small implants used to treat severe thumb arthritis, also called rhizarthrosis (thumb arthritis). This condition affects the joint at the base of your thumb, making it painful to grip, twist, or even open jars. TMPs replace the damaged joint surfaces to reduce pain and improve movement.
You may be wondering why this approach is popular. The idea is that replacing the worn-out joint could help bring back the thumb’s function and take away the pain.
How well do they work?
Let’s look closer at the study findings. Researchers reviewed 224 trapeziometacarpal prostheses implanted between 2006 and 2021. They examined six different models of TMPs:
| Model | Survival Rate | Years Tested |
|---|---|---|
| Arpe(R) | 95.5% | 6-16 |
| Elektra(R) | 80% | 13-14 |
| Ivory(R) | 92.8% | 9-11 |
| Maia(R) | 100% | 8-9 |
| Isis(R) | 99.1% | 1-8 |
| Touch(R) | 100% | 1-4 |
Maia(R), Isis(R), and Touch(R) lasted very well and worked for many years. Elektra(R) lasted much less well, which is important to know.
What are the common complications?
Dislocation and loosening were the most common problems. Dislocation means the implant moves from its place in the joint. Loosening happens when the implant stops holding tightly. Together, these issues affected about 7.5% of the TMPs studied.
- Dislocations: 3.5%
- Loosening or mobilization: 4%
The Elektra(R) model was linked to almost half of these complications. Proper placement of the implant seemed to help reduce problems. Implants placed with scopic guidance had better angles and seemed more stable.
If an implant fails, doctors may do salvage surgery. This is a procedure to fix the problem or remove the implant. In total, 19 patients needed salvage surgery, but only 3% had complete loss of the implant.
What questions do patients ask about TMP?
What is rhizarthrosis?
Rhizarthrosis is arthritis in the thumb joint, causing pain and trouble with daily tasks like opening jars or holding objects.
How long do trapeziometacarpal prostheses usually last?
It depends on the model and placement. The study found some implants lasted over 10 years with high survival rates, while others didn’t perform as well.
What are the risks of TMP implantation?
The main risks are dislocation and loosening of the implant. If these happen, you might need another surgery.
What should I do next about trapeziometacarpal prostheses?
Trapeziometacarpal prostheses can help thumb arthritis, but they have risks. The study shows that picking the right model and careful placement can make a big difference.
If you have thumb pain or arthritis, talk with your doctor about whether a TMP is right for you. They can help you decide and explain things based on your needs.
What is this disclaimer?
This blog should not replace professional medical advice. Always speak with your healthcare provider about your symptoms and treatment options.
Where can I find the full article citation?
Sanchez-Crespo, M. R.; Couceiro-Otero, J.; Del Canto-Alvarez, F. J.; Ayala-Gutierrez, H.; Holgado-Fernandez, M., 2024