Bicipitoradial bursa !
The bicipitoradial bursa is a small fluid sac between the distal biceps tendon and the radius; it cushions the tendon as the forearm turns.
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What it is
A sac between the distal biceps tendon and the radius.
What it does
Cushions the tendon as the forearm turns.
Key facts
- Where
- Between the distal biceps tendon and the radial tuberosity
- Function
- Cushions the tendon as it wraps around the radius in pronation
Relations
- In front
- Distal biceps tendon, which wraps around it
- Lateral
- Supinator, with the posterior interosseous nerve winding around the neck of the radius
- Medial
- Brachial artery and its division into the radial artery and ulnar artery; the median nerve further medial
How to find it
It sits deep in the cubital fossa at the end of the biceps tendon, felt only when enlarged, as a firm fullness below the elbow crease with the forearm supinated.
On imaging
Ultrasound shows a fluid-filled bursa around the tendon; scanning from behind with the forearm pronated brings the radial tuberosity into view. MRI separates bursitis from a partial tendon tear or a tumour.
Clinical notes
- Bursitis and partial tears of the distal biceps tendon often occur together, from repeated pronation and supination or a narrow space between radius and ulna
- Compression of the posterior interosseous nerve gives weak finger and thumb extension without sensory loss
- It can also be inflamed in rheumatoid arthritis or infection; ultrasound-guided aspiration avoids the vessels and nerves around it
Related conditions
Test yourself
Think of the answer, then tap the question to see it.
Where does the bicipitoradial bursa lie, and when is it squeezed?
Between the distal biceps tendon and the front of the radial tuberosity; in pronation the tuberosity turns back and squeezes it.
Which nerves can an enlarged bicipitoradial bursa compress?
The posterior interosseous nerve or the median nerve, as a mass in the cubital fossa.
How does posterior interosseous nerve compression by a bicipitoradial bursitis present?
Weak finger and thumb extension without sensory loss, since the nerve is purely motor at that level.
Educational information, not medical advice. For any symptom, see a health professional.
Its names
- Official Latin (TA2)
- bursa bicipitoradialis TA2 2567
- Official Spanish (DeCS)
- Bolsa bicipitorradial
- English (TA2)
- Bicipitoradial bursa
Related
Sources: Terminologia Anatomica (TA2); Anatomy, Shoulder and Upper Limb, Cubital Fossa; Anatomy, Shoulder and Upper Limb, Biceps Muscle.
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Representative model, for educational purposes only.
