- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01901614
OCT-guided LALAK for KCN
RANDOMIZED CLINICAL TRIAL OF OCT-GUIDED LASER-ASSISTED LAMELLAR ANTERIOR KERATOPLASTY IN ADULTS FOR KERATOCONUS
The purpose of this study is to determine if a new procedure, called laser-assisted lamellar anterior keratoplasty (LALAK), can achieve the same level of vision with a lower risk of potential complications after surgery compared to another corneal transplant procedure. The current procedure is called Intralase-enabled keratoplasty (IEK) and replaces the entire cornea.
The LALAK procedure involves transplanting only the top layers of the cornea instead of the entire cornea. Only one eye will have this experimental procedure performed. If both eyes need to have surgery your doctor will help you decide on the best non-study option for your other eye.
Study Overview
Status
Conditions
Detailed Description
Corneal transplantation (keratoplasty) is the most common organ transplant, with 42,606 procedures in the U.S. in 2009. Many surgeons are moving away from full thickness corneal transplantation, also called penetrating keratoplasty (PK), because of risks involving rejection, irregular astigmatism and wound dehiscence. They are moving towards partial thickness (lamellar) transplantations of either the anterior or posterior (endothelial) layers, which can reduce these risks.
The femtosecond laser has been used to create excellent tongue-in-groove junctions between the graft and host in full thickness PK.1 This technique, called IEK (Intralase-enabled keratoplasty), has now become a standard surgical procedure. The tongue-in-groove junction achieved at the circumferential edge of the graft and host leads to a continuous smooth anterior surface and strong wound healing.
The new technique is called dovetail LALAK. In this technique, the femtosecond laser is used to create a 31% anterior lamellar graft with dove tailed side cuts. It is also used to create a shallow anterior lamellar dissection and beveled side cuts on the recipient cornea to match with the dovetail graft.
In the new technique, the depth of the graft and donor dissections will be guided by OCT measurements. The proposed trial will test if the new technique can reproducibly achieve good visual outcomes without the risk of rejection. The outcome of the LALAK procedure will be compared to that of IEK.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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Oregon
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Portland, Oregon, United States, 97239
- Casey Eye Institute, Oregon Health & Science University
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Eyes with keratoconus that cannot be adequately or safely corrected with spectacles, contact lens or excimer laser surface ablation. The cornea must have healthy endothelium (endothelial cell density > 1,500/mm2).
Exclusion Criteria:
- Preoperative corneal thickness less than 400 microns.
- Corneal edema
- Central guttata
- Inability to give informed consent.
- Inability to maintain stable fixation for OCT imaging.
- Inability to commit to required visits to complete the study.
- Eyes with concurrent cataract, retinal diseases, glaucoma, or other eye conditions that may limit the visual outcome after surgery.
- Patients with severe collagen vascular diseases or ocular surface disorders
Study Plan
How is the study designed?
Design Details
- Primary Purpose: TREATMENT
- Allocation: RANDOMIZED
- Interventional Model: SINGLE_GROUP
- Masking: NONE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
EXPERIMENTAL: LALAK
laser-assisted lamellar anterior keratoplasty.
Optical Coherence Tomography, femtosecond laser, topical anesthesia, and Retrobulbar Block or General Anesthesia will be used.
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OCT will be used to guide the depth of the graft and donor dissections.
The femtosecond laser system to be used in this study for host cornea preparation will be the Intralase FS system (iFS, AMO, Inc., Santa Ana, CA).
The iFS is FDA-approved for corneal surgery including full thickness and lamellar keratoplasty.
Eye banks use earlier versions of the Intralase system which are also FDA approved for this indication.
|
ACTIVE_COMPARATOR: IEK
Intralase-enabled keratoplasty.
Femtosecond laser and Retrobulbar Block or General Anesthesia will be used.
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The femtosecond laser system to be used in this study for host cornea preparation will be the Intralase FS system (iFS, AMO, Inc., Santa Ana, CA).
The iFS is FDA-approved for corneal surgery including full thickness and lamellar keratoplasty.
Eye banks use earlier versions of the Intralase system which are also FDA approved for this indication.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Does LALAK Achieve the Same Level of Post-operative BSCVA as IEK.
Time Frame: 24 months
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The primary goal of the trial is to determine if LALAK can achieve the same level of postoperative Best Spectacle Corrected Visual Acuity (BSCVA) guided by OCT as IEK.
The BSCVA will be measured using a clinic Snellen chart and recorded in the typical Snellen fraction (20/xx) in feet.
This will be converted to logMAR form for statistical analysis.
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24 months
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Collaborators and Investigators
Publications and helpful links
Helpful Links
Study record dates
Study Major Dates
Study Start
Primary Completion (ACTUAL)
Study Completion (ACTUAL)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (ESTIMATE)
Study Record Updates
Last Update Posted (ACTUAL)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- OHSU IRB00009280- PTK
- R01EY018184 (U.S. NIH Grant/Contract)
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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