The knot of Henry is the point in the sole of the foot, near the navicular, where the flexor digitorum longus tendon crosses superficial (plantar) to the flexor hallucis longus tendon. The two tendons are joined here by a fibrous slip and bound by a fibrous sheath, and the medial plantar nerve runs close by.
| Location | Sole of the foot, on the plantar side of the midfoot near the navicular |
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Marks where the long toe flexor tendons cross and exchange fibres; the medial plantar nerve can be compressed here (jogger's foot).
The knot of Henry is the surgical landmark for: (1) FHL transfer to FDL for hallux rigidus (connecting FHL power to the lesser toes via the FDL), (2) medial plantar nerve decompression at the navicular, (3) accessing both long toe flexors for combined reconstruction. Its position beneath the navicular is marked by palpation of the navicular tuberosity on the medial plantar foot.
Nerve compression at the FDL-FHL crossing point producing medial plantar foot burning in runners managed with targeted injection and decompression.
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