What are the pressure tolerant areas in a PTB socket?

The pressure tolerant areas include the anterior compartment, the medial tibial flare, and the patellar ligament (hence the name PTB). Areas that are not pressure tolerant include the fibular head, the hamstring tendons, and the tibial crest [4].

What is PTB socket?

Socket PTB (Patellar Tendon Bearing) The weight bearing takes place below the patella, at the patellar tendon. The suspension is generated by a belt that is tightened around the distal part of the thigh.

What is PTB prosthesis?

The VA’s Prosthetic and Sensory Aids Research Program was respon- sible for the development of the PTB (Patellar-Tendon-Bearing) Below-Knee Prosthesis in 1957. This prosthetic design has since en- abled many amputees to have a less cumbersome artificial limb that provides improved comfort and control.

What is the socket of a prosthesis?

The prosthetic socket is the device that joins your residual limb (stump) to the prosthesis. The socket is made just for you, according to the condition and shape of the residual limb. For a prosthesis to work well it is important that the socket is a ‘good’ fit.

How is a PTB socket different from a pressure cast?

Abstract — This study compared the pressure distribution at the residual limb and socket interface in amputees wearing a pressure cast (PCast) socket system with amputees wearing the patellar-tendon-bearing (PTB) socket. The PCast system requires the subject to place his or her residual limb in a pressure chamber.

What happens if a PTB socket is too tight?

The most common error made with a PTB socket is an excessively tight fit in the popliteal area of the stump. Too large a bulge in the popliteal area can be constrictive, affecting circulation, causing edema, and in turn leading to deterioration of the stump end.

What are the fundamental principles of the PTB socket?

The fundamental principles of the PTB socket have been widely refuted. Hydrostatic theory based on pressure casting techniques, on the other hand, provides an optimal scenario to produce a more uniform stump/socket interface pressure.

Is there an alternative to the PTB socket?

Hydrostatic theory based on pressure casting techniques, on the other hand, provides an optimal scenario to produce a more uniform stump/socket interface pressure. Conclusion: Preliminary studies indicate the pressure casting technique has the potential to produce comfortable sockets, providing an alternative to the PTB design.