tendon
腱 centers on the fibrous tissue that connects muscle to bone: a tendon.
腱 combines the flesh radical ⺼ with 建, which likely contributes the sound and may relate to the idea of something built or structured, like the body's connective framework.
The flesh radical ⺼ on the left and 建 (build) on the right suggest the body's built-in connectors: tendons that tie muscle to bone.
For ケン, imagine a strong tendon named Ken that helps you build things: Ken -> ケン, and the tendon is the body's construction cable.
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tendon
Achilles tendon; calcaneal tendon
tenosynovitis
Achilles tendon reflex
achillobursitis
Achilles tendonitis; Achilles tendinitis
semitendinosus; semitendinosus muscle
rotator cuff
rotator cuff
flexor tendon
bowed tendon
tendon reflex
rotator cuff
rotator cuff tear
rotator interval; rotator cuff interval
tendinitis; tendonitis
cord; tendinous cord
aponeurosis
bunion
sheath of tendon