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ABSTRACT, POSTER PRESENTATION AT THE AOPA’S 101ST NATIONAL ASSEMBLY, SEPT. 26-29, VANCOUVER, CANADA, 2018. DOI: https://doi.org/10.33137/cpoj.v1i2.32026                                                                      

 

1 

 
OPEN  ACCESS 

 

AOPA’S 101 ST NATIONAL ASSEMBLY ABSTRACTS, SEPTEMBER 26-29, VANCOUVER, CANADA, 2018 
 

ABSTRACT (POSTER PRESENTATION) 

MODULAR PRINCIPLE TO PRODUCE ACTIVE PROSTHETIC HAND 

Anton Kruglov1,2*, Gregory Lein1, Igor Shvedovchenko2 

 
1 Scoliologic.ru, Saint-Petersburg, Russia. 
2 Federal Scientific Center of Rehabilitation of the Disabled named after G.A. Albrecht, Saint-Petersburg, Russia. 
* Email: kruglov@scoliologic.ru 

DOI: https://doi.org/10.33137/cpoj.v1i2.32026  

 

INTRODUCTION 

We analyzed the functional prostheses including body 

powered prosthesis1 produced for partial hand 

amputation. There are almost no solutions on the  world 

market for patients with partial hand amputation. There 

is no final solution for stump socket (inner socket) that 

could present both comfort for the stump and cosmetic 

look of the socket, and at the same time had partial 

possibility to take the load and transfer it to the power 

unit.2,3 

METHODS 

The active hand prosthesis from our develop group was 

tested with a cohort of 45 patients - 40 male and 5 female, 

aged 17-55 year old. We carried out questioning within 3 

time intervals - prior to supplying, immediately after 

initial instructing, and after 6 months of using the 

prosthesis. We used universal questionnaire for assessing 

the residual hand function DASH. Besides, we used a 

bench test, evaluating it by the score system before the 

prosthetics and after teaching how to use the prosthesis. 

All the patients with partial hand amputation were 

divided into groups 1.1 and 1.2. The 1.1 group was for 

patients with partial hand amputation at the level from 

second line of wrist bones to exarticulation in 

metacarpophalangeal joint. The 1.2 group - patients with 

fingers amputation distal from heads of proximal phalanx 

(Figure 1). 

 
Figure 1. Diagram of levels of amputations groups. 

Before recommendation of active hand prosthesis 

for patients with above named defects the evaluation 

of wrist's function was made (the moving angle 

should be no less than 30 degrees), as well as of 

palm and fingers flexing muscles' force, as the grasp 

strength of artificial prosthesis fingers is directly 

proportional to this force. 

RESULTS 

The results obtained were statistically significant 

(p≤0,01) (Figure 2, 3). The positive dynamics expressed 

by patients of group 1.1, revealed by 2nd questioning and 

preserved after 6 months of using the prosthesis indicates 

efficiency of using with active hand prosthesis of 

presented construction by patients from group 1.1. Thus, 

indications for this prosthesis should be considered more 

than 50% loss of the hand functions due to amputation 

distal to the metacarpal joints, but proximal to the 

metacarpalphalangeal joints, including oblique 

amputation of the hand with loss of more than 3 fingers. 

The lack of positive dynamics in groups 1.2 and 2.2 is 

associated with high level of residual hand function in 

this category, which is reflected in the data of both the 

bench test and the questionnaire. 

 
Figure 2. Bench test results.  

 

mailto:kruglov@scoliologic.ru
https://doi.org/10.33137/cpoj.v1i2.32026


 

 

Kruglov A, Lein G, Shvedovchenko I. MODULAR PRINCIPLE TO PRODUCE ACTIVE PROSTHETIC HAND. CANADIAN PROSTHETICS & ORTHOTICS JOURNAL, VOLUME 1, ISSUE 2, 2018; 
ABSTRACT, POSTER PRESENTATION AT THE AOPA’S 101ST NATIONAL ASSEMBLY, SEPT. 26-29, VANCOUVER, CANADA, 2018. DOI: https://doi.org/10.33137/cpoj.v1i2.32026                                                                      

 

2 

 
OPEN  ACCESS 

 

AOPA’S 101 ST NATIONAL ASSEMBLY ABSTRACTS, SEPTEMBER 26-29, VANCOUVER, CANADA, 2018 
 

ABSTRACT (POSTER PRESENTATION) 

 
 

 

Figure 3. DASH results.  

 

So, contraindications for the active hand prosthesis 

of the presented design should be considered 

amputation at the fingers level, from the proximal 

phalanx and distally. 

CONCLUSION 

The presented modular prefab system showed its 

versatility and stably positive result of prosthetics for 

patients with various partial hand amputations. 

ACKNOWLEDGEMENT 

This research and design work was carried out in the 

framework of the dissertation research in the Federal 

Scientific Center of Rehabilitation of the Disabled named 

after G.A. Albrecht under the guidance of Prof. I.V. 

Shvedovchenko, with the direct financial participation of 

"Scoliologic.ru" L.L.C. and personally G.A. Lein. 

 

REFERENCES 

1.Kruglov A.V., Shvedovchenko I.V. Current state of 

functional prosthetic application in disabled persons with hand 

and finger stumps // Genij Ortopedii Tom 23, No 3, 2017.     

DOI: 10.18019/1028-4427-2017-23-3-368-373 

2. Schäfer M., Dreher D., Muders F., Kunz S. Prosthetic Fitting 

after Finger and Hand Amputations // Special print from 

Orthopädie technik 8/2014 – published by verlag Orthopädie-

technik, Dortmund.  

3. Schulz S. First experiences with the Vincent hand // "MEC 

11 Raising the Standard," Proceedings of the 2011 

MyoElectric Controls/Powered Prosthetics Symposium 

Fredericton, New Brunswick, Canada: August 14-19, 2011. 

Copyright University of New Brunswick.  

 
 

 


