Most modern implants have high success rates, but failures do happen, and how often depends on the type. Dental implants survive beyond 10 years more than 90% of the time. Breast implants have a roughly 15% to 17% rupture rate at 10 years. Knee and hip replacements last 20 years or more in about 95% of cases. The specific risks, timing, and warning signs vary considerably across these types.
Dental Implant Failure Rates
Dental implants are among the most reliable medical implants available. Within the first 5 to 10 years, survival rates consistently stay above 90%. A 2024 meta-analysis in Clinical Oral Investigations looked at what happens further out and found that roughly 4 out of 5 dental implants survive after 20 years. Retrospective studies in that analysis showed an 88% survival rate at the 20-year mark, while prospective studies ranged from 78% to 92% depending on how missing data was handled.
Those numbers mean that somewhere between 1 in 5 and 1 in 10 dental implants will eventually need to be replaced over two decades. That’s a meaningful failure rate, but it also means the vast majority of people who get dental implants will keep them for a very long time.
Early vs. Late Dental Implant Failure
Dental implant failures fall into two distinct categories with different causes. Early failure happens before the final crown or bridge is placed, typically within the first six months. This is essentially the body rejecting the implant before bone has a chance to grow around it. The main culprits are poor bone quality, surgical trauma, infection, uncontrolled diabetes, osteoporosis, and medications like corticosteroids that interfere with bone healing.
Late failure shows up one to three years after placement and beyond. By this point the implant has already bonded to bone, so the causes are different: excessive bite force, nighttime teeth grinding, infection around the implant, or problems with the crown or bridge sitting on top. Peri-implantitis, an infection of the tissue surrounding the implant, is the most common long-term threat. Research from a U.S. dental school found that about one-third of implant patients and one-fifth of all implants developed peri-implantitis over an average follow-up of two years.
Signs of a Failing Dental Implant
The hallmark symptom is movement. A healthy implant is completely rigid in the jawbone. When bone doesn’t grow properly around it, or when bone loss occurs later, the implant starts to feel loose. At first the movement may be so slight that only a dentist can detect it, but over time a failing implant will feel wobbly when you chew or talk. Pain, swelling, and infection can accompany the looseness, though not always. An X-ray of a failing implant typically reveals significant bone loss around the metal post.
Smoking Roughly Doubles the Risk
Smoking is the single most well-documented lifestyle factor that raises dental implant failure rates. Studies report failure rates in smokers ranging from 6.5% to 20%, compared to significantly lower rates in nonsmokers. For implants placed in bone-grafted areas of the upper jaw, smokers face roughly twice the failure rate regardless of how much they smoke. The mechanism is straightforward: smoking restricts blood flow to healing tissues and slows bone growth around the implant.
Breast Implant Rupture Rates
Breast implants are not designed to last a lifetime, and rupture risk climbs steadily with time. For modern silicone implants (third generation and later), about 98% remain intact at 5 years. By 10 years, that number drops to 83% to 85%, meaning roughly 1 in 6 implants will rupture within a decade.
The specific numbers vary depending on why the implant was placed. In one large study of Allergan implants tracked by MRI, 10-year rupture rates for cosmetic augmentation patients ranged from about 9% to 18%. Patients who received implants as part of breast reconstruction after surgery had higher rupture rates, reaching 35% in some groups. This likely reflects differences in the tissue environment and the additional stress placed on implants in reconstructed breasts.
Silicone implant ruptures can be “silent,” meaning you may not feel or see any change. That’s why periodic imaging is recommended to check implant integrity. When ruptures are detected, the standard approach is surgical removal and replacement if desired.
Knee Replacement Longevity
Total knee replacements are remarkably durable. A study following patients for a minimum of 20 years found survival rates of 94.8% to 96.8%, depending on the implant design used. In practical terms, fewer than 1 in 20 knee replacements needed revision surgery over two decades.
When knee replacements do fail, the most common reasons mirror those of other joint implants: the bond between the implant and bone gradually loosens over years of use, infection develops around the implant, or the plastic spacer between the metal components wears down. Younger, more active patients tend to wear out their implants faster simply because they put more miles on them.
Hip Replacement Failure Patterns
Hip replacements have similar long-term survival to knee replacements, with most lasting well beyond 15 years. When they do fail, three causes account for nearly equal shares of the problem. Aseptic loosening, where the implant gradually separates from the bone without any infection present, makes up about 23% of failures. Instability, where the ball slips out of the socket (dislocation), accounts for another 22%. Infection causes roughly 22% of failures as well.
The near-equal distribution of these three causes means there’s no single dominant failure mode for hip implants. Loosening tends to be a slow, progressive process that develops over many years. Dislocation can happen at any point but is most common in the first few months after surgery. Infection can strike early or late, sometimes years after the original procedure when bacteria from elsewhere in the body settle on the implant.
What Affects Your Personal Risk
Across all implant types, a few factors consistently influence how long an implant lasts. Overall health matters: conditions like uncontrolled diabetes, autoimmune disorders, and osteoporosis impair the body’s ability to maintain a strong bond with any implanted device. Smoking raises failure risk for dental implants specifically and impairs wound healing across the board.
Mechanical stress plays a major role in long-term durability. Teeth grinding wears out dental implants. High-impact activities accelerate wear on joint replacements. Body weight increases the load on knee and hip implants with every step. The skill of the surgeon and the quality of the implant itself also matter, though these are harder for patients to quantify in advance.
Age at the time of the procedure creates a tradeoff. Younger patients heal faster and tend to have better bone quality, but they also need the implant to last longer and will subject it to more total use. A 50-year-old receiving a knee replacement will demand more years of service from it than a 70-year-old, which is why revision rates are higher in younger patient populations despite their biological advantages.