Femoroacetabular Impingement | Prolotherapy

Caring Medical Femoroacetabular Impingement

Ross Hauser, MD

In this article, Ross Hauser, MD discusses the surgical and non-surgical options for Femoroacetabular Impingement. Non-surgical options discussed below include Prolotherapy.

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Femoroacetabular Impingement (FAI) or sometimes diagnosed simply as Hip Impingement is a condition where abnormal contact and rubbing of the ball and socket portion of the hip bones creates joint damaging friction. This “bone-on-bone” situation subsequently develops into degenerative osteoarthritis in addition to causing injuries to the labral area.

“Pincer-type”  and “Cam-type” femoroacetabular impingement

Femoroacetabular Impingement may include acetabulum (socket) deformity, the femoral head may have a non-spherical head, or the orientation of the acetabulum to the femur bone (the angle where they meet) may be off.

In pincer femoroacetabular impingement, when the hip is in full flexion (as in pulling your knee to the chest), the femoral head-neck junction hits the anterosuperior aspect (the front of the acetabulum). This problem is commonly caused by the socket being “too deep,” and the ball will pinch structures like the labrum between the acetabulum and the femur neck, this problem is also diagnosed as coxa profunda or protrusion acetabuli (where the ball of the hip protrudes into the pelvic area).

In cam femoroacetabular impingement, there is abnormal contact between the head and socket of the hip because of a loss of roundness of the femoral head. Cam comes from the Dutch word meaning “cog.” This loss of roundness causes an abnormal contact between the head and the socket of the hip. In cam FAI, the impingement typically occurs when the hip is flexed, but also internally rotated. As already mentioned, patients often have “mixed” FAI, meaning they have a combination of both.

Femoroacetabular Hip Impingement Prolotherapy

Both types of FAI can cause premature osteoarthritis of the hip because both types progress to hip labral and cartilage damage. Hip instability caused by FAI is not limited to the hip area. Doctors at the University of California at San Francisco found that patients with Femoroacetabular impingement (FAI) caused instability in not only the hip but the ankle as well by causing an altering in the gait. The patients favored their bad hip at the expense of the ankle. The ankle instability relayed instability back to the hip.(1)

Diagnosing Femoroacetabular Impingement means NO MRI?

If you have a scan or MRI of your hip, doctors are saying it may as well be worthless. That is a powerful statement, here is some powerful research:

Doctors are noting that one of the main causes of Femoroacetabular impingement is hip arthroscopic surgery.

New research on Femoroacetabular impingement surgery is concerning. Doctors are noting that one of the main causes of Femoroacetabular impingement is hip arthroscopic surgery.

In an editorial, James H. Lubowitz, M.D. (Editor-in-Chief) wrote in the medical journal Arthroscopy:

Hip femoroacetabular impingement is overwhelmingly the primary cause of revision surgery after hip arthroscopy. FAI imaging is confusing and requires additional research. Therefore, hip arthroscopic surgeons must become experts at clinical evaluation and examination.(4)

Clearly a connection to the MRI research mentioned earlier.

In an editorial, Dr. JW THomas Byrd writing in Arthroscopy : the journal of arthroscopic & related surgery, suggests:

When performing arthroscopic surgical management of symptomatic cases of hip femoroacetabular impingement, it is important to consider how much cam lesion resection (removal of labral, cartilage and/or bone) is required, if any. Generally, failure to adequately address a cam lesion could result in progressive damage to the articular cartilage. Thus, while it is important to consider exactly how much arthroscopic intervention is necessary to achieve successful results, the potential consequences of neglecting a cam lesion are at least as worrisome as the risks of indicated cam lesion treatment.(6)

In June 2017, researchers in Denmark, as part of the Danish Hip Arthroscopy Registry study and publishing in the medical journal of the International Society of Orthopaedic Surgery and Traumatology questioned how cartilage degeneration is treated in patients undergoing Femoroacetabular Impingement surgery.

Listen to these results:

In March of 2018, New York University’s Bulletin of the Hospital for Joint Diseases published Beyond the Scope Open Treatment of Femoroacetabular Impingement.

In this paper researchers suggested:

Femoroacetabular Impingement and Hip Instability

In the medical journal Osteoarthritis and Cartilage doctors found:

“The optimal therapy for femoroacetabular impingement is unclear.”

In trying to prove out the surgical option the doctors noted in their research of 18 studies comparing management strategies – No study compared surgical and non-surgical treatment.

When surgical approaches were compared there was evidence of superior symptom outcomes with arthroscopy compared to open surgery and with labral preservation. (The key word here is tissue preservation).

No conclusion regarding the relative efficacy of one surgical approach over the other can be made or even if the surgery caused or prevented osteoarthritis.(9)

The orthopedic surgery suggestion uses the premise that the primary cause of hip impingement is due to the bones of the hip joint coming too close together and pinching various tissues like labrum and cartilage tissue as explained above.

The question however can be asked, what is causing the bones to come too close together? In the physical examination, doctors should look for  damaged connective tissue in the hip capsule or at the three ligaments of the hip and examine the hip labrum to see if stretched or torn tissue is causing the hip joint to become unstable.

Does  femoroacetabular impingement cause hip instability or does hip instability cause  femoroacetabular impingement?

Doctors at the University of Rochester suggest that: High rates of FAI morphologic characteristics are present in patients with hip instability. They share similar characteristics and may predispose the hip to instability through anatomic conflict caused by pincer or cam lesions (or both) levering the femoral head posteriorly.(10)

Hip tendinopathy and Greater trochanteric pain syndrome.

As we have mentioned many times in our hip pain related articles, the hip is a big joint, at Caring Medical and Rehabilitation Services we believe to help patients achieve their treatment goals, they need to have their entire hip treated with our comprehensive Prolotherapy program for hip pain.

Recently in our article on greater trochanter pain syndrome, an example of concentrating on specific hip problems instead of treating the whole hip joint can be found in medical research studies trying to find out why some hip procedures did not work as well as they should have.

The example we cited is a new paper from doctors in Italy who looked to see what caused greater trochanter pain syndrome in patients with suspected femoroacetabular impingement syndrome. After magnetic resonance arthrography of the hip and an evaluation of 189 patients, in the end it was hard to say because there were so many problems with the patient’s hips that they far outnumberd femoroacetabular impingement syndrome problems.

The biggest problem the patients had was 38% had tendinopathy of the hip, 16% had bursitis. Problems considered “normal hip pathology.” So there were many problems causing the patient’s discomfort.

Sports hernia and femoroacetabular impingement in athletes

Dr. David Woznica ProlotherapistDavid N. Woznica, MD discusses sports hernia and femoroacetabular impingement in athletes.

The idea that sports related chronic groin pain represents a major diagnostic and therapeutic challenge in sports medicine has been discussed at length in the medical research. Ohio State University researchers writing in the medical journal Frontiers in Surgery. write the “complexity of the anatomy and biomechanics of the groin makes these injuries more difficult to identify and manage. Patients may find themselves evaluated by multiple physicians and receive numerous diagnostic studies over a period of months.(11)

Italian researchers reporting in the World journal of clinical cases say Femoroacetabular impingement has been reported in as few as 12% to as high as 94% of patients with sports hernias, athletic pubalgia or adductor-related groin pain.

Cam-type impingement is proposed to lead to increased symphyseal motion (resulting in cartilage deterioration)  with overload on the surrounding extra-articular structures and muscle, which can result in the development of sports hernia and athletic pubalgia. In simpler terms, hip/pelvic instability.

In this paper the researchers are suggesting that for patients with FAI and sports hernia, the surgical management of both problems is more effective than sports pubalgia surgery or hip arthroscopy alone (89% vs 33% of cases).

As sports hernias and FAI are typically treated by general and orthopedic surgeons, respectively, a multidisciplinary approach for diagnosis and treatment is recommended for optimal treatment of patients with these injuries.(12)

This idea that to successfully treat sports hernia you would need to surgically repair numerous areas is not new. In 2011 doctors at the Minnesota Orthopedic Sports Medicine Institute wrote: When surgery only addressed either the athletic pubalgia or intra-articular hip pathology in this patient population, outcomes were suboptimal. Surgical management of both disorders concurrently or in a staged manner led to improved postoperative outcomes scoring and an unrestricted return to sporting activity in 89% of hips.(13)

For some athletes this is good news, for others multi-stage surgeries present time off challenges. Here are the results of that study:

Femoroacetabular Impingement Instability Non-Surgical Treatment

Many patients ask us if a congenital (genetic) hip problem requires surgical correction. The answer is – sometimes. Sometimes pelvic osteotomy, femoral osteotomy, or joint replacement surgeries are needed. If someone has avascular necrosis of the hip, sometimes surgery is needed.

When Prolotherapy is considered a good option

For the patient who wants to first explore a more conservative approach, we recommend Prolotherapy inside the joint, as well as around the structures of the joint causing some or all of the pain.

If the patient has some reasonable range of motion remaining, ie 50% or greater normal range of motion, then Prolotherapy works  at helping with the pain and exercises like cycling and swimming will slowly allow the patient to regain some of the lost range of motion.

Some patients have conditions that predispose them to less range of motion. A person may present with 50% of normal motion in his right hip with regard to external rotation compared to his left hip, but not have any pain in the right hip. He may be able to run and continue sports with no problem, as the range of motion deficiency does not necessarily hinder sports performance or feel painful.

In another example, a patient has FAI and his main symptom is groin pain. The patient is a cyclist and is experiencing pain with cycling. In seeing this particular patient, we would try and determine if he truly has FAI on physical examination, looking for a positive impingement sign and then determine the cause of it. If the cause is some tremendous structural problem with the hip like a dysmorphic problem or orientation problem of the femur, then surgical correction may be needed. However the most common cause of FAI and other premature osteoarthritic conditions is simply some type of soft tissue injury such as a ligament injury, so thus Prolotherapy is the best treatment! Injury to the iliofemoral or ischiofemoral ligaments, as well as a torn hip labrum, can cause hip joint instability. Given enough time this can cause premature osteoarthritis and eventually FAI.

Sometimes the patient will only achieve pain relief, which, of course, the patient is excited about. However, some sports like martial arts require not only improved pain levels, but also improved range of motion. So sometimes, even though the patient is a good Prolotherapy candidate for decreasing pain levels, the patient may still need arthroscopy or some other surgical procedure to help with range of motion. It is surprising, however, the high number of patients we have seen over the years who do not really get much improved range of motion with surgical procedures! For those who are inquiring about a surgical procedure for premature osteoarthritis of the hip, have a frank discussion not just with your Prolotherapy doctor, but also with your orthopedic surgeon. If you end up choosing surgery, you can always get Prolotherapy after the surgical procedure. Better yet, if Prolotherapy does not fully meet your expectations, you can always then choose surgery. Our philosophy is always to go the least invasive, most potentially successful route first.

For the patient concerned about surgery for femoroacetabular impingement  who desires a conservative approach, Comprehensive Prolotherapy with the additions of Platelet Rich Plasma and Stem Cell Therapy for the hip may be warranted.

Prolotherapy inside the joint, as well as around the structures of the joint causing some or all of the pain is what we typically do. Prolotherapy, along with other proliferants, addresses all the pain-producing structures. It typically works well with FAI, along with the other conditions causing premature hip osteoarthritis. We use this along with an exercise program that we prescribe geared at stimulating joint health.


Samaan MA, Schwaiger BJ, Gallo MC, et al.  Joint Loading in the Sagittal Plane During Gait Is Associated With Hip Joint Abnormalities in Patients With Femoroacetabular Impingement. Am J Sports Med. 2016 Dec 1:363546516677727. [Google Scholar]

2 Yamauchi R, Inoue R, Chiba D, Yamamoto Y, Harada Y, Takahashi I, Nakaji S, Ishibashi Y. Association of clinical and radiographic signs of femoroacetabular impingement in the general population. J Orthop Sci. 2016 Nov 4. [Google Scholar]

3 Ahn T, Kim CH, Kim TH, Chang JS, Jeong MY, Aditya K, Yoon PW. What is the Prevalence of Radiographic Hip Findings Associated With Femoroacetabular Impingement in Asymptomatic Asian Volunteers? Clin Orthop Relat Res. 2016 Dec;474(12):2655-2661. [Pubmed] [Google Scholar]

4. Lubowitz JH. Editorial Commentary: Hip Femoroacetabular Impingement Surgery Requires Improved Radiologic Research and Expert Understanding of Hip Clinical Examination. Arthroscopy. 2015 Jul;31(7):1391. [Google Scholar]

5. Hanke MS, Steppacher SD, Zurmühle CA, Siebenrock KA, Tannast M. Hips with protrusio acetabuli are at increased risk for failure after femoroacetabular impingement surgery: A 10-year followup. Clinical Orthopaedics and Related Research. 2016 Oct 1;474(10):2168-80. [Google Scholar]

6. Byrd JW. Editorial Commentary: Hip Femoroacetabular Impingement Correction: Risk Versus Reward, or How Much Is Too Much? Arthroscopy. 2017 Apr;33(4):780-782. [Google Scholar]

7. Lund B, Nielsen TG, Lind M. Cartilage status in FAI patients–results from the Danish Hip Arthroscopy Registry (DHAR). SICOT-J. 2017;3.  [Google Scholar]

8. Ryan M, Youm T, Vigdorchik J. Beyond the Scope Open Treatment of Femoroacetabular Impingement. Bulletin of the Hospital for Joint Disease (2013). 2018 Mar;76(1):47-54. [Google Scholar]

9. Fairley J, Wang Y, Teichtahl AJ, Seneviwickrama M, Wluka AE, Brady SR, Hussain SM, Liew S, Cicuttini FM. Management options for femoroacetabular impingement: a systematic review of symptom and structural outcomes. Osteoarthritis Cartilage. 2016 Apr 20. pii: S1063-4584(16)30048-6. [Google Scholar]

10. Canham CD, Yen YM, Giordano BD. Does Femoroacetabular Impingement Cause Hip Instability? A Systematic Review. Arthroscopy. 2015 Sep 27. pii: S0749-8063(15)00646-5. [Google Scholar]

11. Strosberg DS, Ellis TJ, Renton DB. The Role of Femoroacetabular Impingement in Core Muscle Injury/Athletic Pubalgia: Diagnosis and Management. Frontiers in Surgery. 2016;3:6.[Google Scholar]

12 Munegato D, Bigoni M, Gridavilla G, Olmi S, Cesana G, Zatti G. Sports hernia and femoroacetabular impingement in athletes: A systematic review. World Journal of Clinical Cases : WJCC. 2015;3(9):823-830. [Google Scholar]

13. Larson CM, Pierce BR, Giveans MR. Treatment of athletes with symptomatic intra-articular hip pathology and athletic pubalgia/sports hernia: a case series. Arthroscopy. 2011 Jun;27(6):768-75. [Google Scholar]


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