Sage Journals: Discover world-class research

Abstract

Comparative studies with the PTB-suction prosthesis and the ordinary PTB prosthesis have provided opportunities to analyze and understand some functional differences in the suspension of below-knee prostheses. In a roentgenological study of the stump-socket contact significantly less vertical displacement in the PTB-suction prosthesis has been shown. A study of the pressure variations in the suction socket verified the theory of the necessary pressure gradient in the PTB-suction socket. Added negative pressure by muscle action was also observed. An electromyographic study suggested a muscular activity pattern in the suction prosthesis similar to that of a normal leg, as a contrast to the ordinary PTB prosthesis where simultaneous contractions' of antagonistic muscles seemed to be the usual pattern. The latter is interpreted as a defence reaction. An optimal prosthesis has been deduced. It shall have a soft prosthetic socket with a perfect fit, a suction, adhesion and friction fixation and a pressure gradient between the skin and the socket wall with minimum compression distally. The plaster casting shall be done in a downward modelling manner making available space for soft tissue without compression.

References

Bakalim

. Experiences with the PTB prosthesis. Art. Limbs 1965; 9: 14–22

Chino

Pearson

J. R.

Cockrell

J. L.

Mikishko

H. A.

Koepke

G. H

. Negative pressure during swing phase in below-knee prosthesis with rubber sleeve suspension. Arch. Phys. Med. 1975; 56(1)22–26

Erikson

Lemperg

. Roentgenological studies of movements of the amputation stump within the prosthesis socket in below-knee amputees fitted with a PTB prosthesis. Acta ortho. Scand. 1969; 40: 520–529

Giacinto

J. P

. The rubber sleeve suspension for below-knee prosthesis. Orth. and Pros. 1976; 30: 17–19

Grevsten

Marsh

. Suction-type prosthesis for below-knee amputees. A preliminary report. Art. Limbs 1971; 15: 78–80

Grevsten

Erikson

. A roentgenological study of the stump-socket contact and skeletal displacement in the PTB suction prosthesis. Uppsala J. Med. Sci. 1975; 80: 49–57

Grevsten

Stählberg

. Electromyographic study of muscular activity in the amputation stump while walking with PTB and PTB-suction prosthesis. Uppsala J. Med. Sci. 1975; 80: 103–112

Grevsten

. Patellar-tendon-bearing suction prosthesis-clinical experiences. Uppsala J. Med. Sci. 1977; 82: 209–221

Kuhn

G. G

. Kondylen Bettung Münster am unterschenkel Stumpf “KBM-prothese”. Atlas d'Apareillage Prosthique et Orthopedique No. 14, 1966

10.

Pearson

Grevsten

Almby

Marsh

. Pressure variations in the below-knee, patellar tendon bearing suction socket prosthesis. J. Biomech. 1974; 7: 487–496

11.

Pierquin

Fajal

Paquin

J. M

. Prosthëse Tibiale a Emboitage Supracondylien. 1964, Atlas d'Appareillage Prothëtique et Orthopëdique, No. 1

12.

Radcliffe

C. W

. Functional considerations in the fitting of above-knee prosthesis. Art. Limbs 1955; 2: 35–60

13.

Radcliffe

C. W.

Foort

. The patellar-tendon-bearing below-knee prosthesis. Biomechanics Laboratory, University of California, Berkeley and San Francisco 1961

14.

Radcliffe

C. W

. The biomechanics of below-knee prosthesis in normal, level, bipedal walking. Art. Limbs 1962; 6: 16–24

15.

Renström

Goldie

Eeg-Olofsson

. A new leg prosthesis socket. Acta ortho. Scand. 1974; 45: 973–975

16.

Wilson

A. B

. 1 Evaluation of the patellar-tendon-bearing prosthesis and its variations, Prosthetic and Orthotic Practice . Murdoch

. Edward Arnold, London 1969, 105–114

17.

Wilson

A. B

. Art. Limbs 1969; 13: 1–12, ³ Recent advances in below-knee prosthetics.:2

18.

Wilson

L. A.

Lyquist

Radcliffe

C. W

. Air cushion socket for patellar-tendon-bearing below-knee prosthesis. Bull. Pros. Res. 1968; 10: 5–34, 10

Ideas on the suspension of the below-knee prosthesis ∗

Abstract

References