Slipping Rib Syndrome

Patients describe intermittent, sharp, stabbing pain in the lower anterolateral chest wall, costal margin, or upper abdomen - characteristically episodic and triggered by specific movements. Pain is typically unilateral and may radiate to the back, flank, or epigastrium. The hallmark symptom when present is a clicking, popping, or snapping sensation at the costal margin (helpful when present, but its absence does not exclude the diagnosis). Provoking factors include trunk rotation, bending, reaching, lifting, twisting, rising from sitting, coughing, sneezing, laughing, and deep inspiration. Episodes are often followed by a dull ache for minutes to hours. Most patients have already seen multiple clinicians and undergone extensive investigations.

Examination - the hooking manoeuvre is the classic provocative test:

• •Hook the fingers under the inferior costal margin at the affected area (usually ribs 8, 9, or 10) and pull anteriorly and superiorly
• •A positive test reproduces the patient's typical pain AND produces a palpable or audible click. Pain alone is suggestive but less specific

Also assess focal tenderness along the costal margin, compare contralaterally, screen for hypermobility (Beighton score), assess the thoracic spine (costovertebral dysfunction may coexist), and examine the abdomen (should be normal).

Key differentials: costochondritis (upper ribs 2 to 5, no clicking), Tietze syndrome (single costochondral swelling), intercostal strain, rib stress fracture (focal bony tenderness), costovertebral dysfunction, 12th rib syndrome (flank or groin radiation), cholecystitis, peptic ulcer, IBS, thoracic radiculopathy, and cardiac causes.

Slipping rib syndrome is a clinical diagnosis - the hooking manoeuvre is the classic provocative test and standard imaging is typically normal. Investigations are primarily to exclude alternative diagnoses, not to confirm the diagnosis.

No routine investigations are needed if the clinical picture is confident and there are no red flags. Investigations to exclude alternative diagnoses are guided by clinical concern: chest X-ray (typically normal), abdominal USS or bloods if abdominal pathology is in question (LFTs, amylase, FBC, CRP), ECG for cardiac symptoms, upper GI endoscopy if gastro-oesophageal pathology is suspected, and CT abdomen if persistent abdominal pain warrants further investigation.

Dynamic USS during the hooking manoeuvre is a useful adjunctive imaging test - real-time ultrasound can visualise the rib tip subluxing (operator-dependent). 3D reconstructed CT of the rib cage is reserved for surgical planning.

USS-guided diagnostic intercostal nerve block: substantial pain reduction during the hooking manoeuvre after local anaesthetic infiltration supports the intercostal nerve as the pain generator and predicts response to definitive nerve-targeted intervention.

Management is stepped: conservative care first, then injection therapy, then surgical intervention for refractory cases. Awareness and a confident diagnosis are themselves therapeutic - many patients have been told their symptoms are unexplained and simply having a diagnosis provides significant relief.

Conservative management (first-line): education and reassurance, activity modification (reduce trunk rotation loading), analgesia (paracetamol, topical NSAIDs, short oral NSAID courses; neuropathic agents per NICE CG173 if neuropathic features predominate), taping or bracing of the lower rib cage to reduce rib tip excursion, manual therapy of the thoracic spine and costovertebral joints if stiffness contributes (avoid direct mobilisation of the hypermobile rib tip), and core and trunk stabilisation.

Injection therapy (second-line, for persistent symptoms): USS-guided intercostal nerve block (local anaesthetic with or without corticosteroid) provides diagnostic support and temporary therapeutic benefit. Cryoablation or radiofrequency ablation of the intercostal nerve can bridge between temporary blocks and surgery and is available in some UK pain or SEM settings. Prolotherapy has limited evidence and is not standard UK care.

Surgical management (third-line): surgical stabilisation is the modern preferred approach - the Hansen technique (suturing the hypermobile rib to the stable rib above, often with a bioabsorbable plate) restores anatomy and stabilises the interchondral connection. Observational case series suggest good outcomes in selected patients. Rib tip excision is an alternative but increasingly less favoured. 3D reconstructed CT is often used for surgical planning.

Referral: most cases manage in primary care or MSK/SEM clinics. Refer to specialist MSK/SEM clinic for diagnostic uncertainty or injection therapy. Refer to thoracic surgery if symptoms are refractory.

Phase 1 (symptom management and education): identify and modify provocative activities, analgesia, taping of the lower rib cage, gentle thoracic mobility (foam roller extension, seated rotation, cat-cow), and diaphragmatic breathing retraining (apical breathing increases accessory muscle loading on the lower ribs). Avoid forceful trunk rotation, heavy lifting, and movements that reproduce the click.

Phase 2 (core and trunk stabilisation): transversus abdominis, multifidus, and pelvic floor work to provide dynamic rib cage stability (progress from isometric to functional integration). Controlled oblique strengthening (side planks, pallof press, anti-rotation), scapular and upper-back strengthening, hip and pelvis stability.

Phase 3 (graduated return): progressive reintroduction of trunk rotation and sport-specific movement with technique modification. Criteria-based return for athletes: pain-free provocation testing, pain-free sport-specific movement, adequate trunk strength.

Post-surgical: 0 to 2 weeks wound care and supported mobility; 2 to 6 weeks progressive trunk mobility and gentle core strengthening; 6 to 12 weeks progressive strengthening and return to sport-specific activities. Most patients return to full function within 8 to 12 weeks.

• •Cyriax (1919) - original description; the eponymous Cyriax syndrome remains in use alongside slipping rib, clicking rib, and rib tip syndrome.
• •Hansen et al. - description of the surgical stabilisation technique using bioabsorbable plate fixation, now the preferred operative approach over rib tip excision.
• •McMahon (Curr Sports Med Rep 2018) - review establishing the stepped management framework and the central role of the hooking manoeuvre.
• •NICE CG173 (Neuropathic pain) - framework for neuropathic adjuncts where neuropathic features predominate.
• •NICE CKS: Chest pain - cardiac, pulmonary, and abdominal causes must always be considered alongside musculoskeletal differentials.

• •Slipping rib syndrome involves false ribs 8 to 10; the 10th rib is most commonly affected.
• •The hooking manoeuvre reproduces pain AND a click when strongly positive.
• •Standard imaging is typically normal - this is a clinical diagnosis.
• •Dynamic USS and USS-guided diagnostic nerve block provide objective support.
• •Surgical stabilisation (Hansen technique) is the modern preferred approach over rib tip excision.
• •Always exclude cardiac, pulmonary, and abdominal causes before settling on the diagnosis.