Avoiding Surgery for Your Knee Pain: The Benefits of Prolotherapy

For patients with knee pain who want to explore options before considering surgery, prolotherapy is one non-surgical treatment worth understanding, particularly since it’s often confused with other injection-based therapies. The same approach applied to the shoulder is described in prolotherapy for shoulder pain.

What Prolotherapy Actually Is

Prolotherapy involves injecting a dextrose (sugar water) solution into the area around a weakened or injured ligament or tendon. It’s a different treatment from platelet-rich plasma or stem cell injections, since it doesn’t use any blood-derived or biologic material. The theory is that the injection triggers a mild, localized inflammatory response that may prompt the body’s natural repair process in the treated tissue.

Who Might Consider It

Prolotherapy is typically considered for chronic knee pain related to ligament laxity or tendon irritation that hasn’t responded well to physical therapy or other conservative treatment, in patients looking to explore options before knee replacement surgery. It’s generally not a first-line treatment and works best after more established options have been tried.

What the Evidence Shows

Research on prolotherapy for knee osteoarthritis and ligament injuries is still developing, with some studies showing meaningful improvement in pain and function, and others showing more modest results. Because the evidence base is mixed, it’s best approached as one option among several rather than a guaranteed alternative to surgery. The equivalent decision-making for the knee is laid out in how to approach knee pain treatment.

What a Treatment Course Looks Like

Prolotherapy typically involves a series of injections spaced several weeks apart rather than a single visit. Sessions are generally well tolerated, with temporary soreness at the injection site being the most common and short-lived side effect. Individual results vary, and prolotherapy is not guaranteed to eliminate knee pain or avoid the need for surgery.

If you’re exploring non-surgical options for knee pain, a pain management provider can help you understand whether prolotherapy is a reasonable fit for your situation.

Frequently asked questions

Does trying prolotherapy first affect a knee replacement done later?
There is no evidence that it does. The solution is placed around soft tissue rather than into the joint surfaces, so it is not generally considered to complicate a later operation. Time is the bigger consideration: when a knee is already severely arthritic and function is declining month by month, a long delay can affect how well recovery from surgery goes.

Is prolotherapy worth trying for a bone-on-bone knee?
Usually not as a way to avoid replacement. Once imaging shows cartilage is largely gone, the pain is coming from the joint surface rather than from lax ligaments, which is what this treatment targets. Some providers still use it for painful ligaments or tendons around such a knee, but the realistic goal there is comfort, not a change in the joint itself.

Can prolotherapy help knee pain left over from an old ACL or MCL injury?
It is sometimes used for lingering tenderness or mild laxity around a healed ligament, particularly at the attachment points where it meets bone. It is not a substitute for reconstruction when a ligament is fully torn and the knee gives way under load. An examination that formally tests the knee for instability is what separates those two situations.

Can prolotherapy be used in a knee that also has a meniscus tear?
It may be considered when the tear is degenerative and the symptoms seem to come from surrounding ligament and tendon irritation. A knee that locks, catches, gives way or will not fully straighten points instead toward a mechanical problem that needs a surgical opinion first. Examination plus imaging is what separates those two pictures before any injection is planned.