Classification
- Costovertebral joint (rib head joint): Synovial plane
- Costotransverse joint (rib tubercle joint): Synovial plane
- Degrees of freedom: 1 (rotation of the rib around its long axis, producing bucket-handle and pump-handle movements during respiration)
- Region: Thoracic spine; ribs 1–10 have both joints; ribs 11 and 12 lack costotransverse joints (floating ribs)
Articular Surfaces
Costovertebral Joint Proper
- Rib head (convex): Each rib head (ribs 2–9) has two facets separated by a horizontal crest. The superior facet articulates with the vertebral body above; the inferior facet articulates with the vertebral body at the same level. The crest attaches to the intervertebral disc via the intra-articular ligament.
- Vertebral body demi-facets (concave): Two demi-facets (partial facets) on adjacent vertebral bodies that together form a complete socket for the rib head.
- Exception: Ribs 1, 10, 11, and 12 articulate with a single vertebral body (full facet) rather than spanning two vertebrae.
Costotransverse Joint
- Rib tubercle (convex): The tubercle on the posterior rib surface (near the neck) articulates with the transverse process facet.
- Transverse process facet (concave): A facet on the anterior surface of the transverse process. The shape varies regionally — upper thoracic facets are concave (allowing rotation); lower thoracic facets are flat (allowing gliding).
Movements and ROM
| Movement |
Description |
Ribs Involved |
| Pump-handle (sagittal) |
The anterior rib end elevates during inspiration, increasing the AP diameter of the thorax |
Ribs 1–6 (predominantly) |
| Bucket-handle (frontal) |
The midshaft of the rib elevates laterally during inspiration, increasing the transverse diameter |
Ribs 7–10 (predominantly) |
| Caliper (lateral expansion) |
The lower floating ribs spread laterally |
Ribs 11–12 |
Rib axis of rotation: Upper ribs rotate around a more transverse axis (producing pump-handle motion). Lower ribs rotate around a more AP axis (producing bucket-handle motion). This difference is determined by the orientation of the costovertebral and costotransverse joints at each level.
Capsular Pattern
Pain on deep breathing; restriction of rib motion during inspiration and expiration
There is no clearly defined proportional capsular pattern. Costovertebral capsular restriction limits rib excursion during respiration, producing localized pain on deep breathing, coughing, or sneezing.
Resting Position
- Midway between full inspiration and full expiration (end-expiration)
Close-Packed Position
- Full inspiration (ribs maximally elevated)
End-Feels
| Movement |
Normal End-Feel |
Type |
| Rib spring (PA pressure on rib angle) |
Springy / capsular (firm) |
The rib should have a slight spring when pressed; a rigid, unyielding response suggests hypomobility |
| Inspiration end-range |
Capsular (firm) |
Costotransverse and costovertebral ligaments, intercostal muscles |
Ligaments
Radiate Ligament
- Attachments: Anterior rib head → vertebral bodies above and below and the intervertebral disc
- Function: Reinforces the anterior costovertebral joint; resists rib separation from the vertebral bodies
Intra-articular Ligament
- Attachments: Crest of the rib head → intervertebral disc
- Function: Divides the costovertebral joint into two compartments; anchors the rib head to the disc
Costotransverse Ligament
- Attachments: Posterior rib neck → anterior transverse process at the same level
- Function: Binds the rib to the transverse process; resists superior and lateral rib displacement
Superior Costotransverse Ligament
- Attachments: Superior border of the rib neck → inferior border of the transverse process above
- Function: Resists downward rib movement; the strongest costotransverse ligament
Lateral Costotransverse Ligament
- Attachments: Tip of the transverse process → posterior rib tubercle
- Function: Resists medial rib displacement; short and strong
Mobilization Techniques
Hands-on instruction is required. The descriptions below provide clinical reference detail for understanding and supervised practice. They are not a substitute for instructor-led technique training. Correct hand placement, force dosage, and tissue response interpretation require hands-on coaching and feedback.
General Contraindications
- Absolute: Rib fracture (the most common thoracic fracture — clinical: point tenderness, pain with compression, crepitus), flail chest, pneumothorax, osteoporosis with high fracture risk, malignancy (rib metastases are common), active infection
- Relative: Osteoporosis (Grade I–II only, gentle), significant rib cage deformity, intercostal neuralgia (gentle grades may help; aggressive mobilization may exacerbate)
PA Rib Glide (Rib Spring)
Purpose: Restores costovertebral and costotransverse joint mobility at a specific rib level. Assesses and treats rib hypomobility producing localized thoracic or posterior chest wall pain.
Patient position:
- Prone on the treatment table
- Arms at sides or hanging off the edge
Hand placement:
- Mobilizing hand: Thenar eminence or overlapping thumbs placed over the rib angle (approximately 3–4 cm lateral to the spinous process at the corresponding level). The rib angle is where the rib curves laterally — it is the most accessible point for applying PA force to the costovertebral joint.
- Guiding hand: Supports and reinforces the mobilizing hand.
Technique execution:
- Apply an oscillatory force directed anteriorly (toward the table) on the rib angle
- The rib should "spring" — a normal rib has slight resilience when pushed anteriorly. Hypomobile ribs feel rigid and unyielding.
- Grade I–II: Gentle oscillations for pain modulation and assessment. Feel for the quality of rib spring — compare to adjacent levels and the contralateral side.
- Grade III–IV: Oscillations into end-range rib spring resistance for mobility restoration.
- Duration: 30–60 seconds per rib, 2–3 sets
- Reassess rib spring quality and respiratory excursion between sets
Indications:
- Decreased rib spring on PA testing (rigid, unyielding feel compared to adjacent ribs)
- Localized posterior chest wall pain that worsens with deep breathing
- Restricted thoracic rotation or lateral flexion (rib cage stiffness limits thoracic movement)
- Post-surgical or post-immobilization rib stiffness
Technique notes:
- Rib count verification: Count ribs from rib 12 upward (the lowest floating rib) or from rib 1 downward (first rib palpable at the base of the posterior triangle of the neck). Misidentification of the rib level is a common error.
- Common error: Applying force to the thoracic spine rather than the rib angle. The rib angle is lateral to the transverse process.
- Reassessment: Re-test rib spring and have the patient take a deep breath. Improved expansion on the treated side confirms costovertebral involvement.
First Rib Inferior Glide
Purpose: Restores mobility of the first rib, which is a common restriction in patients with thoracic outlet syndrome, scalene hypertonia, and upper thoracic pain. An elevated first rib narrows the costoclavicular space and can compress neurovascular structures.
Patient position:
- Seated or supine
- Cervical spine in neutral
Hand placement:
- Stabilizing hand: Supports the patient's head from the opposite side or stabilizes the cervical spine
- Mobilizing hand: The thumb, fingertip, or web space contacts the superior surface of the first rib (palpable in the posterior triangle of the neck, anterior to the upper trapezius, posterior to the clavicle). The contact is on the superior rib surface, directed inferiorly (caudally).
Technique execution:
- Apply an oscillatory force directed inferiorly (caudally), pushing the first rib toward the patient's feet
- Grade I–II: Gentle oscillations to assess mobility and modulate pain
- Grade III: Oscillations into the inferior resistance — the scalene muscles and costotransverse ligaments provide the barrier
- Duration: 20–30 seconds per set, 2–3 sets
Indications:
- Elevated first rib on palpation (compare height bilaterally)
- Scalene hypertonia with restricted first rib depression
- Thoracic outlet syndrome symptoms (neurovascular compression)
- Upper thoracic and cervicothoracic junction pain
Technique notes:
- Scalenes must be released first. The scalenes attach to the first rib and actively elevate it. Mobilizing against hypertonic scalenes is ineffective. Release the scalenes first, then mobilize the rib.
- Critical structure nearby: The brachial plexus and subclavian artery pass over the first rib between the anterior and middle scalenes. Palpate gently and do not compress these structures.
Muscles Crossing These Joints
Muscles Attaching to Ribs
Conditions Affecting These Joints
- Costovertebral dysfunction — hypomobility of rib joints producing posterior thoracic pain exacerbated by deep breathing; frequently misdiagnosed as muscular or facet pain
- Rib fracture — point tenderness at the fracture site, pain with thoracic compression, crepitus; absolute contraindication to mobilization
- conditions/thoracic-outlet-syndrome — elevated first rib narrows the costoclavicular space; first rib mobilization is a key treatment component
- Costochondritis / Tietze syndrome — inflammation at the costochondral junctions (anterior rib-cartilage junction); anterior chest wall pain that may mimic cardiac pain
- Intercostal neuralgia — irritation of intercostal nerves producing band-like pain along the rib distribution
Clinical Notes
- Costovertebral dysfunction is a "great mimicker." Rib joint pain can mimic cardiac pain (left-sided), hepatobiliary pain (right lower ribs), renal pain (posterolateral), or pleuritic pain (with respiratory exacerbation). Always rule out visceral pathology before treating musculoskeletal rib dysfunction.
- The first rib is clinically the most important. An elevated, hypomobile first rib is implicated in thoracic outlet syndrome, upper thoracic pain, scalene spasm, and cervicothoracic junction dysfunction. Always assess first rib position and mobility in patients with upper extremity neurovascular symptoms.
- Respiratory assessment is a functional outcome. Measure thoracic expansion (tape measure at xiphoid level: full inspiration minus full expiration; normal >3 cm difference) before and after costovertebral mobilization. Improved expansion confirms rib mobility improvement.
Key Takeaways
- Costovertebral joints govern rib motion during respiration — upper ribs produce pump-handle (AP expansion), lower ribs produce bucket-handle (lateral expansion).
- Costovertebral dysfunction is a "great mimicker" — always rule out visceral pathology before treating rib joint pain.
- The first rib is the most clinically important — its elevation narrows the costoclavicular space and contributes to thoracic outlet syndrome.
- Always release the scalenes before mobilizing the first rib — they actively elevate it and resist inferior mobilization.
