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Companies

Tetrous

Bone fiber implants for tendon-to-bone repair

Raised to date

$1.7M

of $4M offered across 1 Form D filing

Still open
$2.3M
Investors
64
Last filed
Apr 22, 2026

About

Tetrous, Inc. is a regenerative medicine company developing biologic implants that improve bone-to-tendon healing at the enthesis, the interface where tendon attaches to bone. Its EnFix product line consists of 100% demineralized bone fiber allograft implants used in rotator cuff repair and other sports medicine procedures. The company holds multiple U.S. patents on demineralized bone fiber implants for enthesis repair and has expanded labeled clinical applications beyond the rotator cuff to biceps tenodesis, insertional Achilles tendinopathy, gluteus medius and proximal hamstring reattachment, and lateral epicondyle repair. It sells through surgeon channels in the U.S. and via distribution agreements internationally, including New Zealand and the wider Asia-Pacific market.

Tetrous positions EnFix as the only product line of 100% demineralized bone allograft implants designed specifically to enhance reformation of the enthesis, using proprietary Bone Textile and FormLok technologies to produce long, strong osteoconductive and osteoinductive fibers that promote cell wicking, adhesion and proliferation.

Funding

  • EquityFiled Apr 22, 2026Form D
    $1.7M/ $4M

Product

EnFix

Orthopedic biologic implant

A line of 100% demineralized bone fiber allograft implants placed at the tendon-to-bone interface during orthopedic repair to promote reformation of the enthesis. EnFix RC is designed for use with suture anchors in rotator cuff repair, and EnFix TAC (available as TAC-T and TAC-O) is a tack-style implant that complements it.

  • 100% demineralized bone fiber allograft
  • Osteoconductive and osteoinductive fibers
  • Bone Textile technology producing long, strong fibers that promote cell wicking, adhesion and proliferation

Built for

Orthopedic and sports medicine surgeons performing rotator cuff and other tendon-to-bone repairs, plus their hospitals and surgery centers, reached in the U.S. directly and abroad through distributors.

People on file