Dr. Alptekin Aksan Profile

Dr. Alptekin Aksan

at Shriners Hospital

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 27 June 2002 Paper

Quantitative determination of subablative thermal exposure producing optimal response of collagenous tissues

Alptekin Aksan, John McGrath

Proceedings Volume 4617, (2002) https://doi.org/10.1117/12.472511

KEYWORDS: Tissues, Collagen, Finite element methods, Optical simulations, Molecules, Thermography, Therapeutics, Thermal modeling, Nd:YAG lasers, Computer simulations

Read Abstract +

Sub-ablative thermal exposure is applied clinically to stabilize joints by taking advantage of the fact that such heating causes collagenous tissues to shrink. Unfortunately heating also generally causes tissue material properties to degrade, owing to the denaturation of the collagen network. The literature reveals that different modalities of heating such as laser and radio frequency modes create different amounts of shrinkage and varying levels of thermal damage (mechanical property degradation) within the target tissue. The relationship between shrinkage and denaturation is poorly understood, limiting the rational design of such thermal therapies. In the present research, a preliminary thermomechanical modeling capable of predicting the final state of a collagenous tissue undergoing sub-ablative heating is presented. The hybrid methodology utilized includes in-vitro experimentation and finite element analysis. It has been shown that the proposed methodology has excellent potential as a tool in simulating and determining the optimal responses of collagenous tissues when they are subjected to sub-ablative thermal treatments.

Proceedings Article | 1 June 2001 Paper

Novel adjuvant therapy for heat-assisted capsular shift procedures

Alptekin Aksan, John McGrath

Proceedings Volume 4247, (2001) https://doi.org/10.1117/12.427851

KEYWORDS: Tissues, Collagen, Heat therapy, Injuries, Molecules, Surgery, In vitro testing, Laser ablation, Opacity, Skin

Read Abstract +

Heat-Assisted Capsular Shift (HACS) procedures are currently applied to treat shoulder (glenohumeral) instability. The therapy aims at thermally denaturing the collagenous framework, thus shrinking the surrounding soft tissues of the lax glenohumeral joint. The desired outcome of the therapy is restoring the kinematic stability of the joint without degrading its mechanical stability. Reports describing the outcome of HACS procedures reveal considerable variations, most likely due to utilization of different heat deposition modalities and the diversity of the thermal treatment protocols applied. The uncertainty of the outcome is also amplified by the post-heating recovery from shrinkage and the heat-induced degradation of mechanical stability. This study introduces a novel method designed to minimize the adverse effects of current therapies. A mechanical property enhancement technique in the form of an adjuvant chemical treatment is presented. In-vitro experiments performed on rabbit patellar tendons using a new arthroscopic fluid with thermal treatment indicate therapeutic improvement compared to therapies based on heating alone. A decrease in the strain recovery as large as 50% and an increase in stiffness as much as 100% have been produced in collagenous tissues without compromising strength. In summary, this work presents the initial results of an effort aimed at increasing the safety and reliability of currently applied HACS procedures by optimal manipulation of novel thermo-chemical treatments.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years