Osteitis Pubis in Soccer Players and Long-Distance Runners: Why It Is Often Mistaken for Athletic Pubalgia or Adductor Enthesopathy — Dr. Moriwaki on the Pathology of Chronic Inflammation and Bone Resorption at the Pubic Symphysis, and What Peri-Symphyseal Injection of Stem Cell Conditioned Media Can and Cannot Achieve2026.08.11

A sharp pain shooting into the groin during a late-game kick, or a dull ache creeping into the pubic area after months of long-distance running — have you been dismissing this kind of pain as “overuse” or “adductor fatigue”? It may in fact be a sign of osteitis pubis, a condition in which chronic inflammation and bone resorption progress directly at the pubic symphysis. This condition is most common in soccer players, long-distance runners, rugby players, ice hockey players, and combat athletes — sports that repeatedly load the pelvis with adduction and abduction of the lower limbs. Because its symptoms overlap closely with athletic pubalgia and adductor enthesopathy, treatment strategies often go astray at the early stage. In this article, Dr. Shin Moriwaki of AVAN TOKYO Ginza organizes the pathology of osteitis pubis, the key differential points, and the honest boundaries of what peri-symphyseal injection of stem cell conditioned media can and cannot address.

Key Points of This Article

・Osteitis pubis is a chronic repetitive-stress condition of the pubic symphysis common in soccer players and long-distance runners, and it is easily confused with athletic pubalgia or adductor enthesopathy

・The pubic symphysis is a fibrocartilaginous joint; long-term repetitive stress leads to disc degeneration, bone resorption, and bone marrow edema

・Differential diagnosis requires point tenderness over the symphysis itself, the bilateral adductor squeeze test, and MRI assessment of bone marrow edema

・Peri-symphyseal injection of stem cell conditioned media in osteitis pubis can address the peri-articular inflammatory environment, but cannot restore altered bone architecture or eliminate the mechanical load itself

・Conservative management — graded modification of athletic load and functional restoration of the adductors and core — remains the foundation; injection is only a complementary component

What Is Osteitis Pubis — Chronic Inflammation Driven by Repetitive Stress at the Pubic Symphysis

The pubic symphysis is a joint in which the left and right pubic bones are joined through a fibrocartilaginous interpubic disc. It normally has only a few millimeters of mobility, but in sports that repeatedly impose single-leg loading and asymmetric pelvic rotation — kicking, stop-and-go movements, sharp cutting, long-distance running — persistent shear stress accumulates at the symphysis. Over years, this leads to disc degeneration, bone resorption at the articular surfaces of the pubis, microcystic changes, and bone marrow edema — the chronic state of the condition.

Sports and Background at Higher Risk

Osteitis pubis is especially frequent in soccer players in positions with heavy kicking demands (forwards and midfielders), and is also seen in rugby, ice hockey, combat sports, and long-distance running. Involvement may be unilateral or bilateral, but symptoms tend to appear more on the stance-leg side of the kicking motion. One reason it so easily becomes chronic is that the symphysis is a joint with very little motion, making post-injury re-education difficult; small repetitive stresses continue to build up through daily activity.

What Happens at the Disc, Bone, and Enthesis

Many muscles and tendons — the adductor group, rectus abdominis, oblique abdominals, pectineus, gracilis — insert around the pubic symphysis, concentrating traction stress onto the disc and bone. In the chronic phase, inflammatory cytokines such as IL-1β and TNF-α persist around the joint, and osteoclast activity dominates, producing the radiographic picture of pubic surface resorption and irregular joint space. Although individual variability is substantial, this disturbance of bone metabolism is a key driver behind the chronicity of pain.

Differentiating from Athletic Pubalgia and Adductor Enthesopathy — Same “Groin Pain,” Different Treatment Design

In athletes presenting with groin pain, the following conditions must be carefully separated. Repeating injections or massage without a settled diagnosis risks missing the true target condition.

Pain Location and Provocation

In osteitis pubis, a one-finger point of tenderness is typically found directly over the symphysis, and pain is reproduced at the symphysis by the bilateral adductor squeeze test — squeezing the knees together against resistance in supine position with knees bent. In adductor enthesopathy, tenderness is localized to the pubic insertion of the long adductor tendon, and adductor resistance testing provokes pain along the myotendinous region. In athletic pubalgia (so-called sports hernia), weakness of the abdominal wall fascia is the background; tenderness near the deep inguinal ring and pain provoked by Valsalva maneuvers (raising intra-abdominal pressure) are characteristic.

Choosing the Right Imaging

Plain radiographs can show joint-space irregularity, bone resorption, and cystic changes at the symphysis, but findings may be sparse in early cases. MRI with STIR or fat-suppressed T2-weighted imaging revealing bilateral bone marrow edema at the pubic rami is a strong finding supporting the diagnosis. Ultrasound is useful in daily practice to evaluate degeneration and hypoechoic changes at the adductor insertion and abnormalities around the inguinal canal for the differential. For general orthopedic references, see the Japanese Orthopaedic Association.

What Peri-Symphyseal Injection of Stem Cell Conditioned Media Can and Cannot Do

What It Can Address — Restoring the Peri-Articular Inflammatory Environment

Peri-symphyseal injection of stem cell conditioned media for this condition aims to modulate the persistent inflammatory cytokine environment around the joint and its entheses. Growth factors contained in the conditioned media — TGF-β, IGF-1, bFGF, HGF — are hypothesized to act on the reparative environment of tendon, ligament, and peri-articular tissue. Under ultrasound guidance, small aliquots are delivered around the symphysis and enthesis; while the medium does not enter the joint cavity itself, it can play a supportive role in calming the surrounding inflammatory cycle.

What It Cannot Address — Bone Architecture and Athletic Load Itself

On the other hand, peri-symphyseal injection cannot anatomically reverse the joint-space irregularity or bone resorption that has already developed. It also cannot erase the mechanical stress imposed by kicking, sudden deceleration, or other sport-specific motions. Treatment cannot be built around “injection alone”; a realistic design combines the three pillars of load modification, functional restoration, and injection, with the recognition that response varies from patient to patient.

Treatment Design — Three Pillars of Load Management, Functional Restoration, and Injection

Conservative Care Is the Foundation

Treatment of this condition rests on conservative care. First, athletic load is graded down: during flare-ups, kicking, sprinting, and sudden stops are temporarily paused, and the athlete transitions to pain-free aerobic work (aquatic exercise, cycle ergometer). Second, functional restoration training is introduced progressively for the adductor group, transversus abdominis, and pelvic floor, along with a reassessment of pelvic alignment and lower-limb kinematics.

Where Stem Cell Conditioned Media Injection Fits In

In chronic cases with poor response to conservative therapy, peri-symphyseal injection of stem cell conditioned media may be considered as a parallel component. Multiple doses are typically given at intervals of two to four weeks, with objective outcome measures — tenderness scores, pain on the squeeze test, and return to kicking — used to judge effect. For details, see more information on stem cell conditioned media joint injections.

Border with Surgery

In severe refractory cases where pain persists for more than six months of conservative care and interferes with daily life or continued sport, surgical options — such as symphyseal curettage or arthrodesis — are considered. At this stage, injection alone is unlikely to bring improvement, and orthopedic re-evaluation becomes necessary.

Frequently Asked Questions

Q. Which movements aggravate osteitis pubis?

Kicking, sudden changes of direction, sprinting, stair climbing, turning in bed, and single-leg standing — motions that load the pelvis asymmetrically — tend to aggravate the pain. Reproducing pain at the symphysis with the bilateral adductor squeeze test is a characteristic finding.

Q. Can strengthening the adductors prevent it?

Functional restoration of the adductors is important, but prevention cannot be achieved by that alone. A comprehensive approach is required, including coordinated activation of deep core muscles such as the transversus abdominis and pelvic floor, re-education of pelvic alignment, and review of kicking mechanics.

Q. Can injections of stem cell conditioned media alone cure the condition?

This is not a treatment aimed at complete cure by injection alone. The essence of osteitis pubis is chronic inflammation and bone resorption driven by repetitive mechanical stress; the injection becomes meaningful only when combined with load modification and functional restoration. Response varies between individuals, and outcomes also depend on disease stage and continued athletic exposure.

Q. Is peri-symphyseal injection covered by insurance?

Peri-articular injection with stem cell conditioned media is provided as private-pay care in Japan. Because it cannot be combined with insured medical care, please make your decision after receiving full explanation of cost, number of sessions, and expected time frame.

Q. How long until I can return to sport?

This varies substantially with disease stage; mild cases often require three to four months, while chronic cases may take six months or longer. Because resuming full-power kicking the moment pain subsides carries a high recurrence risk, adhering to a graded return-to-load protocol is essential.

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Medical Supervision: Dr. Shin Moriwaki (Supervising Physician)

Member, Japan Society of Aesthetic Surgery (JSAS)

Member, American Academy of Aesthetic Medicine

ECFMG Certificate (U.S. Medical Licensing Qualification)

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