摘要:

The objective of this study was to determine the frequency content of the surface bumpiness in shapes encountered in prosthetic and orthotic practice. This information is important in evaluating digitizers for use in prosthetic and orthotic CAD/CAM; a digitizer's frequency response should be capable of recording the intricacies of a limb's shape without degradation. A digitizing system without adequate frequency response has results analogous to a loudspeaker that muffles high frequency notes.Of the shapes commonly encountered, below-knee (BK) residua were found to have surface undulations of the highest frequency. Fifty-five BK limbs were digitized, and evaluated to determine the spatial frequency spectra of the surface. Shapes with known frequencies were also tested, in order to ensure proper performance of the algorithm. The frequency content of the BK limbs was limited to 10 cycles per circumference or lower.

ISSN:1040-8800    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

The result of a knee disarticulation amputation allows the distal redundant tissues, which were left mobile, to be actively ranged from full extension to approximately 45 degrees of simulated knee flexion. It could not be determined from the intraoperative notes whether a myoplasty or myodesis was performed, however, the patella was left intact.Several previous attempts at prosthetic fitting were tried. Both transtibial and knee disarticulation designs were used, with less than desirable outcomes.The current approach focuses on the ability of the patient to actively range the distal tissues of his residual limb. Using the elasticity of the ALPS Clear Pro liner for mobility and suspension we were able to use the locking pin as a pseudotibial lever. The prosthetic design incorporated a supracondylar/suprapatellar type of socket with joints and corset, ALPS Clear Pro liner with clutch lock, Otto Bock endoskeletal components, and an Otto Bock single axis foot.

ISSN:1040-8800    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

Experimental stress analysis on various ankle-foot orthoses (AFOs) was conducted. A complete experimental testing system has been developed successfully. Results revealed that the peak stress in the orthoses occurred in the neck region. This was consistent with earlier Finite Element Analysis (FEA) (1,2) and clinical observation. Thus, failure in the neck region was common. Based on the present investigation, following suggestions has been made. AFO should be made asymmetrically and the lateral side of the neck region should be wider and/or thicker than the medial side.

ISSN:1040-8800    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

Rapid prototyping technology has revolutionized the way parts are engineered and designed. Stereolithography (SL), a form of rapid prototyping, receives data from a CAD (computer-aided design) system and cures a liquid photopolymer resin with a laser to form a solid three-dimensional object.The manufacture of prosthetic test sockets traditionally has been accomplished by vacuum forming a thermoplastic material over a casting. Stereolithography technology bypasses the need for casting and fabricates the socket directly from the mold. Two test sockets were fabricated using stereolithography and fit to a transtibial amputee. The manufacturing and capital costs were evaluated. Currently, the cost of using stereolithography is exceeding the cost of current methods of prosthetic test socket fabrication.Stereolithography technology is in its infancy but changing rapidly. In the future, all prosthetic sockets and orthoses may be directly manufactured saving time and money while maintaining product quality.

ISSN:1040-8800    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

This article presents an alternative method of donning for transfemoral amputees who use or wish to use suction as their primary form of suspension. The author investigated the possibility of combining wet donning (lotion) with electromechanical reduction of air pressure (vacuum) within the prosthetic interface to develop a possible donning technique. The author hypothesized this method would allow a transfemoral amputee with additional physical impairments the possibility to consistently use suction as a form of suspension. Results showed positive results, indicating it is possible to provide total contact with a combination of residual-limb lubrication and electromechanical reduction of air pressure within the interface.

ISSN:1040-8800    

出版商:OVID    

年代:1998

数据来源: OVID