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Tendon vs. Ligament: Structural and Functional Differences

Tendons and ligaments are both dense regular connective tissues composed primarily of type I collagen, but they serve distinct anatomical and biomechanical roles.

Fundamental Difference

Common Injuries

Tendon: Tendinopathy (overuse), rupture (Achilles, rotator cuff, biceps), tenosynovitis.
Ligament: Sprain (Grade I–III), tear (ACL, MCL, ATFL, UCL), laxity.

Healing Capacity

Both heal slowly due to hypovascularity.
Tendon: Better if sheath intact (synovial nutrition); surgical repair for complete rupture.
Ligament: Extra-articular (MCL) heal well; intra-articular (ACL) do not heal — require reconstruction.

Memory Aid

Tendon = Tension (pulls bone). Ligament = Link (links bones).

Tick Bites - Related Articles

Feature	Tendon	Ligament
Connection	Muscle → Bone	Bone → Bone
Primary Function	Transmit muscle force to skeleton → movement	Stabilize joints; limit excessive motion
Collagen Arrangement	Parallel bundles (high tensile strength)	Parallel + interwoven (multi-directional stability)
Elasticity	Low (4–6% strain)	Slightly higher (allows joint play)
Blood Supply	Poor (avascular zones)	Poor (especially intra-articular: ACL)
Innervation	Golgi tendon organs (proprioception, force feedback)	Mechanoreceptors (joint position sense)