Key result
The PTB-suction prosthesis significantly reduced the downward displacement of the skeletal stump to a mean of 1.13 cm compared to 2.25 cm with the strap-suspended PTB prosthesis.
Why the study?
Does the PTB-suction prosthesis reduce skeletal displacement and improve stump-socket contact compared to the strap-suspended PTB prosthesis in below-knee amputees?
Observational (n=22)
No
Does the PTB-suction prosthesis reduce skeletal displacement and improve stump-socket contact compared to the strap-suspended PTB prosthesis in below-knee amputees?
Mean Difference: 1.15
Absolute Event Rate: 1.13% vs 2.25%
The PTB-suction prosthesis provides complete stump-socket contact and reduces skeletal displacement by half compared to the strap-suspended PTB prosthesis, improving stability and circulation.
May support PTB-suction prosthesis for better stump stability in below-knee amputees; leaves open functional benefits pending randomized trials.
The PTB-suction prosthesis has been studied by a roentgenological technique. There is complete contact between the skin of the stump and the plastic inner surface of the socket. The movement of the stump in the socket is minimal. The displacement of the skeletal stump is reduced to half in the PTB-suction prosthesis, compared with the strap-suspended PTB prosthesis. As a result, the stability between stump and socket is increased, provided that the stump is sufficiently long. Skin sores are avoided. The prosthesis, when adequately fitted, guarantees a good circulation within the stump and a cosmetically favourable fit with a feeling of walking with "a normal leg".
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Grevsten et al. (1975) conducted an observational in Below-knee amputation (n=22). PTB-suction prosthesis vs. Strap-suspended PTB prosthesis was evaluated on Downward displacement of the skeletal stump in the socket during the swing phase (position C) (MD 1.15 cm). The PTB-suction prosthesis significantly reduced the downward displacement of the skeletal stump to a mean of 1.13 cm compared to 2.25 cm with the strap-suspended PTB prosthesis.
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