The best age to have a knee replacement is between the ages of 60 to 70 years old, with the average age being around 65 to 67 years old for a knee replacement.
This age range is ideal for having a knee replacement due to implant lifespan and activity levels.
Older adults often place slightly less continuous mechanical stress and high impact wear on the artificial joint than younger and more active people.
And modern artificial knee joints also often last around 15 years to 20 years, although some artificial knee joints can last 25 years to 30 years with proper care.
So getting the knee replacement surgery in your 60s also reduces the likelihood that you will need a complex second surgery, which is known as a revision later in life.
People under age 60, including people in their 40s and 50s are getting knee replacements due to early onset osteoarthritis or previous injuries.
Although younger people who have a knee replacement also face a higher lifetime risk of wearing out the knee implant and needing a revision.
Doctors might also recommend early knee replacement surgery if severe, end stage pain and joint disability destroy your quality of life and non surgical treatments such as physical therapy, weight management or injections no longer work.
And delaying too long can also cause permanent muscle weakness or even lower limb deformities.
The biggest complaint after knee replacement is persistent pain, followed by joint stiffness and limited range of motion.
While the primary goal of knee replacement surgery is pain relief, some people experience ongoing soreness, aching or sharp discomfort, which lingers past the initial healing phase.
For the joint stiffness and arthrofibrosis, tightness in the joint and difficulty bending or straightening the knee, which is often caused by scar tissue development, frequently make everyday tasks, such as climbing stairs or driving challenging after a knee replacement.
Other biggest complaints after knee replacement are prolonged swelling, sleep disruption and unmet expectations.
Roughly 10 percent to 20 percent of people who had a knee replacement report long term dissatisfaction because of the artificial knee joint not feeling or functioning exactly like a natural, pre-injury knee.
And for sleep disruption after knee replacement, difficulty finding a comfortable sleeping position with the new knee joint, is a very common early frustration after a knee replacement.
Some contributing factors to these complaints after a knee replacement include under rehabilitating or skipping physical therapy, overexertion too early and preoperative severity.
For preoperative severity, people who entered surgery with severe, long standing chronic pain, high anxiety, or deconditioned muscles often have a harder time with post surgical recovery.
And for overexertion, pushing the joint into high impact activities before soft tissues heal can trigger inflammation, pain and setbacks.
And for under rehabilitating or skipping physical therapy, failing to consistently perform prescribed stretches and mobility exercises also allows scar tissue to restrict flexibility.
On a scale of 1 to 10 the painfulness of a knee replacement is between a 5 to 8 out of a 10 and peaks up to around 9 out of 10 during the first couple of days after the knee replacement.
While the pain can be between a 9 out of 10 during the first few days, it starts to go down to around a 5 and 8 out of 10 as time goes on and you recover.
And the pain after a knee replacement is also well managed with modern pain protocols.
In days 1 to 3 after a knee replacement, which is the acute phase, the pain after the knee replacement often ranges from 5 to 9 out of 10, especially as the regional nerve blocks wear off and swelling peaks.
The pain in days 1 to 3 after a knee replacement, is often described as a deep ache, heavy pressure, throbbing, or tightness rather than a sharp knife like pain.
In weeks 1 to 2 after a knee replacement, the pain remains the most intense during this stretch, most particularly when bending, straightening or starting physical therapy, although baseline pain steadily drops.
And in weeks 3 to 6 after a knee replacement, the pain and discomfort decreases significantly, often lowering to a 1 to 4 out of 10 range, with soreness, mainly being triggered by movement or exercises.
And in 3 months and beyond after a knee replacement, most people report major relief with the pain dropping to less than 1 out of 10, although mild, intermittent aching or stiffness can still occasionally linger for up to a year.
Things that influence the pain after a knee replacement, include physical therapy, swelling and inflammation and multimodal management.
For multimodal management, surgeons use a combination of nerve blocks, anti-inflammatory medications, acetaminophen, ice therapy, and timed oral medications to keep the pain under control before it spikes.
And much of the early discomfort after a knee replacement, also comes from internal joint trauma and fluid buildup rather than the artificial knee replacement implant itself.
And moving the joint early after a knee replacement hurts, although doctors also emphasize that staying mobile and doing prescribed stretches prevents permanent stiffness and actually accelerates the reduction of pain.