Patellar Tendon-Bearing
Also written as: PTB — Patellar Tendon-Bearing
A design principle in lower-limb orthotics and prosthetics in which load is transferred to the patellar tendon region to offload the distal limb or foot.
Full Definition
Patellar tendon-bearing (PTB) refers to a socket or orthotic design feature that uses a shelf or brim positioned to bear body weight through the patellar tendon and tibial flares, thereby reducing or eliminating load at the foot and ankle. Originally developed in prosthetics, the concept was adapted into orthotics for managing conditions requiring distal offloading, such as Charcot neuroarthropathy and complex ankle fractures. In editorial review, the term is hyphenated as a compound modifier ('patellar tendon-bearing brace') but written without a hyphen when 'bearing' is used predicatively. The abbreviation PTB may refer to either the prosthetic or orthotic application; context must be clear.
Usage
Usage note: Hyphenate consistently when used as a compound modifier. Clarify in context whether PTB refers to a prosthetic or orthotic application.
In Context
- "A patellar tendon-bearing orthosis was fitted to allow partial ambulation while offloading the acute Charcot foot." — Diabetic foot service clinical letter
- "The PTB design relies on accurate brim contouring; editorial review of fitting notes should confirm this is documented." — Orthotic audit report