Osteitis Pubis

Original Editor - Tehseen ZahraTop contributors-{Tehseen Zahra, Lucinda hampton, Pacifique Dusabeyezu, Kim Jackson, Shreya Pavaskar and Aminat Abolade

Introduction

Osteitis pubis is defined as an idiopathic, inflammatory condition of the pubic symphysis and surrounding structures, but it is most likely related to overuse or trauma. Osteitis pubis was first described in patients who had undergone suprapubic surgery, and it remains a well-known complication of invasive procedures about the pelvis. It may also occur as an inflammatory process in athletes.

Image 1: anterior view of the pelvis.

Quick Facts

• Osteitis pubis is a rare cause of groin pain but is more common in athletic patients, specifically soccer players, runners, and rugby players.
• Patients often present with groin pain made worse with activity.
• Plain radiographs and MRIs may aid with the diagnosis.
• The condition is usually treated with NSAIDs, activity restriction, and physical therapy.
• In rare cases, surgical intervention may be required.

Clinical presentation

The presentation is typical with varying degrees of pelvic and/or perineal pain, reproduced on hip adduction.

Epidemiology

To date, there has been no epidemiological study to determine the true incidence of osteitis pubis. The incidence in athletes has been reported as 0.5% to 8%, with a higher incidence in distance runners and athletes in kicking sports, in particular, male soccer players who account for 10% to 18% of injuries per year.

Etiology

Image 2: Anterior view pelvis, pubis bone red.

Although the aetiology is sometimes unknown, the most common causes are:

• Pregnancy/childbirth
• High-level of athletic activity: see athletic pubalgia
• Urological or gynaecological surgery
• Trauma
• psoriatic arthritis
• ankylosing spondylitis

Pathophysiology

The pubic symphysis is a non-synovial amphiarthrodial joint with an interposed fibrocartilaginous disc separating hyaline cartilage. The joint normally has minimal motion due to the static ligamentous complex. The pubic symphysis serves as the insertion point of the rectus abdominis and origin of the adductor complex. The antagonistic nature of the rectus abdominis, which elevates the pubic symphysis while the adductors depress the joint, serves as a nidus for the development of osteitis pubis—the repetitive use of the anterior pelvic musculature results in chronic tendinosis. The chronic muscle imbalance results in abnormal forces across the pubic symphysis, causing symphyseal instability, pubic bone stress reaction, and eventually degeneration of the hyaline cartilage. Another emerging theory poses that osteitis pubis develops secondary to increased compensatory motion across the joint because of limited motion elsewhere in the kinetic chain, such as in femoroacetabular impingement.

Diagnosis

Both radiographs and MRI aid in the diagnosis of osteitis pubis. In the early stage, plain radiographs might appear normal.

• In chronic osteitis pubis, the pubic symphysis demonstrates lytic changes, sclerosis, and widening.
• Dynamic instability of the pubic symphysis can be observed on the flamingo view (obtained by double- and single-legged stance positions bilaterally on a pelvic anterior-posterior radiograph). Greater than 2 mm of subluxation is considered a positive finding for symphyseal instability.
• MRI has become the imaging modality of choice. MRI has a high sensitivity for distinguishing between chronic and acute cases.

Treatment

The management of osteitis pubis includes both conservative and surgical options.

The first option remains conservative treatment.

• Conservative management includes: rest, NSAIDs; progressive course of physical therapy (see pubalgia). There is no standard conservative treatment protocol resulting in a variety of outcomes. The conservative treatment of osteitis pubis can be protracted. It may take some athletes six months or more to return to the preinjury level, but more commonly, most return by 3 months.
• Albeit protracted, conservative management remains the mainstay of treatment. Only approximately 5% to 10% of athletes require surgical treatment.

Steroid injections have been demonstrated as a useful adjunctive therapy

If conservative management does fail, surgical intervention may be required. The timeframe of when to consider conservative treatment as a failure ranges and no set timetable has been established. Commonly, a minimum of six months of conservative treatment is attempted before surgical options are discussed.

Differential Diagnosis

• Athletic pubalgia
• Osteomyelitis
• Adductor strain
• Rectus Abdominus strain

Viewing

The short video below is of Physiotherapy techniques used for osteitis pubis

References

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