Differentiating Painful Rib (Costochondral) Syndrome and Slipping Rib Syndrome

Anatomic Differences

Costochondritis/Tietze syndrome affects the costochondral junctions of ribs 3‑7, most often presenting on the left side or retrosternally, without any rib subluxation or hypermobility. 1
Slipping rib syndrome involves the false ribs 8‑10, where defective costal cartilage allows actual subluxation of the rib from its normal joint position. 2

In costochondritis, patients describe pain as stinging (≈ 53 %) or pressing (≈ 35 %); the pain is sharp, stabbing, and worsens with inspiration or palpation. Episodes occur more than once daily in ≈ 63 % of patients, and a chronic course (> 6 months) is seen in ≈ 55 % of cases. Pain is typically retrosternal (≈ 52 %) or left‑sided (≈ 69 %). 1

The hallmark of costochondritis is reproducible tenderness on palpation of the affected costochondral joints, with no rib mobility, clicking, or chest‑wall asymmetry; direct palpation reproduces the pain, confirming a musculoskeletal origin. 3

Diagnosis of costochondritis is primarily clinical, based on the characteristic examination findings. An electrocardiogram should be obtained within 10 minutes in patients > 35 years or those with cardiac risk factors to exclude acute coronary syndrome. Imaging is reserved for atypical presentations, and laboratory studies are generally not useful (though inflammatory markers may be modestly elevated). [3][1]
For slipping rib syndrome, dynamic ultrasound is the imaging modality of choice, detecting the condition in 89 % of cases and reliably ruling it out when negative (100 % negative predictive value). This recommendation is supported by the American College of Radiology. 4

Costochondritis first‑line therapy: a 1‑2 week course of non‑steroidal anti‑inflammatory drugs (NSAIDs).
Second‑line: add low‑dose colchicine if symptoms persist despite NSAIDs.
Alternatives/adjuncts: acetaminophen when NSAIDs are contraindicated, topical lidocaine patches for localized relief, and ice packs as supportive therapy. Reassessment is required if pain persists to exclude other etiologies. All recommendations are based on clinical guideline consensus. 1

Nitroglycerin response should not be used as a diagnostic criterion, because relief does not differentiate cardiac from non‑cardiac chest pain. 1
In patients with high cardiac risk, cardiac evaluation must not be delayed; coronary artery disease can coexist with musculoskeletal chest‑wall findings. 1

Costochondritis presents with bilateral tenderness over the costochondral junctions of ribs 3–6 that commonly follows a recent upper‑respiratory infection with coughing, supporting this diagnosis. 5
Patients with costochondritis typically exhibit normal vital signs and appear well, indicating a benign musculoskeletal etiology rather than cardiac or pulmonary disease. 6

Tietze syndrome is differentiated by localized inflammation of one or two costochondral joints (usually ribs 2–3) with visible or palpable swelling, unlike the multi‑level bilateral tenderness of costochondritis. 5
Precordial catch syndrome is characterized by sudden, brief (seconds‑to‑minutes), sharp periapical chest pain that worsens with inspiration, occurs at rest without preceding illness, and is confined to a single point, distinguishing it from the persistent, multi‑site tenderness of costochondritis. 7