What are the types of TF sockets?
- Quadrilateral
- Ischial containment (aka. Ischial containment narrow M/L)
The quadrilateral socket is analogous to this of the TT sockets
PTB (old standard)
Quadrilateral socket: where are the A/P trimlines located?
Below the ischial tuberosity
Weight bearing surface for quadrilateral sockets
All weight on ischial tuberosity
Dimensions of a quadrilateral socket
- Wider M/L dimensions than A/P
- No tapering
How might a lack of tapering of the quadrilateral socket impact gait?
- Glute med acts on femur
- Cannot stabilize the pelvis until the femur stops moving within the socket
What are the advantages of the ischial containment socket?
- More intimate connection between femur and pelvis
- Trimlines create more stability
- Rotation control
How do amputees stabilize the limb?
By pressing to the lateral aspect of the socket
Why does the ischial containment socket create more stability during rotation?
Contoured around the muscle belly
What types of suspension are used for TF?
- Traditional suction
- Silicone liner
- Lanyard
- Active vacuum
- TES Belt
- Silesian Bandage
- Pelvic belt and hip joint
Which type of socket is becoming more common with TF pts?
Active vacuum
Traditional suction suspension: How do you get all the flesh down into a tight socket?
- pull sock
- pull leg in, then pull sock out
Traditional suction suspension: How does air get out?
- one-way valve
- allows air out but not in to maintain suction
- uses a pull-sock
Indications for traditional suction sockets
Amputees with very stable volume of RL
Disadvantages of traditional suction suspension
- need balance to don in standing
- doesn’t accommodate volume changes
Advantage to a traditional suction suspension
- not typically a problem with skin
- suction prevents pistoning
How does the silicone liner suspension work?
- ring creates suction inside the limb (as opposed to skin)
- may spray with alcohol to help slide in socket
- takes multiple steps to evacuate air (one-way valve already in place)
What might be used for silicone liner suspension if there is volume loss?
Sock strip to push the ring out farther
What are the advantages to a silicone liner suspension?
- requires less balance to don/doff
- can don in sitting, unlike traditional
How does a lanyard suspension work?
- strap fed through the bottom
- buckled on the side
Pin and shuttle lanyard suspension benefits
- more simple suspension type
- avoids mechanism malfunctioning
Silicone liner with an active vacuum suspension
Has external vacuum applied to constantly pull air out
TES belt
Total
Elastic
Sleeve
When would TES belts be used?
May be used as an auxiliary suspension for someone who might want a pin and shuttle
