LET'S TALK. 303-429-6448

The Perc-ACLR

The Trusted Alternative to ACL Surgery

If you are searching for “stem cell therapy for ACL tear,” what you need instead is the Perc-ACLR – The Trusted Alternative to ACL Surgery

Want to Avoid ACL Surgery?

The Regenexx® Perc-ACLR procedure for ACL tears was developed to treat full and partial anterior cruciate ligament tears non-surgically. ACL tears are one of the more common knee injuries we treat and many non-retracted full and partial tears can be treated in all but the most serious cases.

The procedure is comprised of a highly precise X-ray guided injection of your own concentrated, mesenchymal stem cells, which can be completed in one day. It is far less invasive than surgery, and generally requires far shorter recovery times than ACL reconstruction surgery.

The Perc-ACLR offers a viable alternative for individuals who may be considering surgery due to a partial or complete non-retracted ACL tear. Our patients avoid the lengthy periods of downtime and painful ACL surgery rehabilitation that follows traditional invasive anterior cruciate ligament surgeries. In fact, see in the following table to compare how the Perc-ACLR stacks up to ACL surgery:

Meet the Perc-ACLR


What type of ACL tears can be treated with the Perc-ACLR?

There are various way to classify ACL tears, but, in regenerative medicine we define these tears by 3 types:

Partial Thickness ACL Tear
A partial-thickness ACL tear is one that hasn’t torn completely through. It’s exactly as it sounds—on imaging, we would see that a portion of the ligament is still intact. This can be treated with the Perc-ACLR.

Full-Thickness Non-retracted ACL Tear
A full thickness nonretracted ACL tear is one that has torn all the way through; however, it hasn’t completely pulled apart or snapped back like a rubber band would. The ligament is certainly fully torn, but the pieces are still in place. This can be treated with the Perc-ACLR.

Full-Thickness Retracted ACL Tear
A full thickness retracted ACL tear is one that has torn through, but in this case, the two pieces have pulled apart or maybe even snapped back like a rubber band. This cannot be treated with the Perc-ACLR.

What goes into the Perc-ACLR? – 4 Major Things:

1. Flex Lab Platform

We use advanced, proprietary lab-processing techniques to ensure that we have the right concentrations of the right cells to treat your specific injury.

2. Image Guidance

To maximize the efficacy of our procedures, C-Arm Fluoroscopy is utilized to help place the concentrated Orthobiologics directly where they are most needed to bring about the best outcome.

3. Expertise & Training

To perform this precise, image-guided procedure, it takes Board certified physicians trained on specific equipment. The doctors at Centeno-Schultz Clinic are practitioners and instructors of Interventional Orthopedics.

4. Orthobiologics

Orthobiologics refers to substances that are naturally derived substances from the body, e.g. stem cells & blood platelets. These substances, when placed well, have the ability to help bones, joints, muscles, and tendons mend.

Before and After MRI of Perc-ACLR Procedure



Centeno-Schultz Clinic has been repairing ACLs for a Long Time…


Years upon years of repairing ACLs with precise injections of stem cells and platelets has supplied Centeno-Schultz Clinic and Regenexx Network years of MRI evidence. In the following video, Dr. Centeno goes over 23 Before-and-After ACL MRIs.


Registry Data: Perc-ACLR Outcomes Over Time

Outcomes in Terms of Function


Patients value getting back to the activities they love — whether that is walking, running, skiing, or high-level sports.

Prior to the Perc-ACLR, patients report that they are limited to an average of 60% of their optimal function. After receiving treatment, they report averages up to 88%. The functional questionnaire represented here is the Lower Extremity Functional Scale (LEFS).

Last updated on 2/2/2021

Outcomes in Terms of Joint Pain


A main priority of Centeno-Schultz Clinic is to decrease joint pain. Prior to receiving treatment, patients report average pain of over 3/10. After only 1-month, pain levels decrease to an average of 1.8/10, a decrease of 47%. Pain levels decrease further over time. The questionnaire used is the Numeric Pain Scale (NPS).

Last updated on 2/2/2021

Outcomes in Terms of Overall Condition


Patients feel their joints are, on average, already 35% better after only 1-month, and continue to improve from there. The questionnaire used is the Single Assessment Numeric Evaluation (SANE).

Last updated on 2/2/2021


Everyone at Regenexx, at the Centeno-Schultz Clinic, were very kind and respectful. Dr. Pitts was the greatest! I appreciated his expertise and his sense of humor. I also appreciated that he respected my modesty. I had stem cell injections in my knees and right hip, with a follow up of PRP a couple of days later. The results, especially in my knees, have been incredible! My knees feel 95% better than before, and it has only been 8 weeks in the treatments. I would totally do this again, and I would totally go back to Dr. Pitts at Centeno-Schultz! (see on Google)

Cynthia Cottam

Knees and Right Hip


Very impressed with the healing resulting from treatments on my damaged ankle and knees. Life it’s has improved so much now!

Star Hunley

Knee and Ankle

After having ACL surgery, a minimum of 6 months is needed before returning to normal activity. Because of potential risks of reinjury, however, most surgeons recommend waiting 7 to 9 months. Aside from having a lengthy recovery period, there are many long-term issues that come with ACL surgery and should be seriously considered. In fact, research has shown that ACL surgery doesn’t prevent arthritis and is ineffective. In athlete patients, for example, those who didn’t have ACL surgery are more able to return to sports after one year than those who did have the surgery. These alone may be good reasons to avoid surgery; however, there are many more:

  • Reconstructing the ACL often leaves the joint rotationally unstable.
  • The knee is never quite the same after ACL surgery with the loss of both position sense and performance.
  • There’s an increased risk of tearing the other ACL or re-tearing the operated-on ACL after surgery.
  • Two-thirds of teens who undergo ACL surgery will develop arthritis by age 30.
  • Eight months following ACL surgery, less than 1 in 5 athletes can return to play.
  • ACL surgery shortens professional athletes’’ careers.

Obviously, the best possible scenario for a torn ACL would be to heal the ligament in place. Our procedure is intended to do just that. Do yourself a favor and consult a Centeno-Schultz Clinic physician to see if ACL surgery is something you can avoid.

Most people think that getting ACL surgery is like replacing a tire in their car. The old one is taken out, and a new one is installed. Good as new! Regrettably, none of this is remotely true. ACL surgery involves installing a poor copy of the original equipment in an invasive procedure.

Strains or sprains to the ACL typically heal with rest, but at the point of ACL tear, the main treatment option is ACL surgery. This involves applying a tissue graft taken from somewherein the body or a cadaver. This graft attaches at a steeper angle than the original tendon which goes in at the wrong angle, has no position sensors, and is often lacking cells that can maintain it and keep it healthy. This causes more compression on the cartilage in the knee and greatly increased chance of osteoarthritis while the position sense and strength in the repaired knee are never the same. In addition, as is typical with orthopedic surgeries, patients who get this surgery are significantly more likely to experience additional knee injuries.

Keeping your own ligament allows for better alignment of the fibers in the direction of maximum force which is better than installing a faux ligament created from a tendon. In addition, you get to keep all of the position sensors in your own ligament, all of which help to control the knee muscles during activity. Finally, your own ligament has your cells which can keep the structure repaired and maintained.