🦵 Tendon Sheath
A tendon sheath is a thin layer of tissue that surrounds certain tendons, mainly in the hands, wrists, and feet. It acts like a lubricated tunnel to help tendons move smoothly.
🧩 Structure & Function
- Synovial lining – produces fluid to reduce friction
- Outer fibrous layer – protects the tendon from wear
- Function:
- Reduces friction during movement
- Protects tendons from damage
- Helps maintain tendon alignment
⚠️ Common issues
- Tendonitis: inflammation of the tendon itself
- Tenosynovitis: inflammation of the tendon sheath
- Symptoms: pain, swelling, stiffness, sometimes a “creaking” sensation
- Causes: repetitive motion, infection, or injury
đź’ˇ Examples
- De Quervain’s tenosynovitis: tendon sheath inflammation at the thumb side of the wrist
- Trigger finger: thickening of the sheath prevents smooth tendon movement
🏥 Treatment
- Rest and immobilization
- Anti-inflammatory medications
- Physical therapy
- In severe cases, surgery to release the sheath
If you want, I can draw a simple diagram of a tendon and its sheath so you can see exactly how it protects and surrounds the tendon.
