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Arthroscopic Autologous Chondrocyte Implantation Versus Microfractures

This study has been completed.
National Council of Science and Technology, Mexico
Information provided by (Responsible Party):
Aldo Izaguirre, Instituto Nacional de Rehabilitacion Identifier:
First received: February 4, 2012
Last updated: April 11, 2017
Last verified: April 2017
This is a phase III, randomised controlled trial of matrix-encapsulated chondrocyte implantation procedure compared to the microfracture procedure in the repair of symptomatic cartilage lesions of the knee. Eligible patients were asked for informed consent preoperatively and randomised for chondrocyte implantation of microfractures. Those patients allocated to the chondrocyte implantation group will be harvested at time of first arthroscopic procedure and concurrent lesions were treated, as meniscus repair, ligament reconstruction, or malalignment corrected. The patients allocated to microfracture will be treated at the time of the only arthroscopic procedure. Both groups will have the same rehabilitation program. Prospective clinical, radiographic and magnetic resonance imaging will be performed as main outcomes.

Condition Intervention Phase
Tear; Knee, Cartilage, Articular Procedure: Matrix encapsulated chondrocyte implantation Procedure: Microfracture awl Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Matrix-encapsulated Arthroscopic Autologous Chondrocyte Implantation Versus Microfractures for Articular Cartilage Regeneration. Randomised Clinical Trial.

Further study details as provided by Aldo Izaguirre, Instituto Nacional de Rehabilitacion:

Primary Outcome Measures:
  • MRI T2 Mapping [ Time Frame: 24 months ]
    Special magnetic resonance imaging technique for measurement of collagen and water content, expressed in milliseconds.

Secondary Outcome Measures:
  • Clinical evaluation [ Time Frame: 0, 10, 30 days; 3, 6, 9 ,12, 24, 36 months ]
    Clinical assessment with validated knee scores, and adverse effects register are taken.

Enrollment: 48
Study Start Date: January 2010
Study Completion Date: January 2015
Primary Completion Date: January 2015 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Chondrocyte implantation
From a previous biopsy, articular cartilage matrix is digested and chondrocytes are cultured in 2 passages until implants with at least 6,000,000 cells are constructed. These constructus of 8 mm in diameter are implanted arthroscopically by means of biodegradable anchor (MINILOK QUICKANCHOR TM from DePuy-Mitek ) located at the defect and tied securely.
Procedure: Matrix encapsulated chondrocyte implantation
Each implant contains 6,000,000 autologous chondrocytes.
Experimental: Microfractures
Subchondral bone perforations that allow a clot to be formed, and subsequent scar at the cartilage defect area.
Procedure: Microfracture awl
Is an awl that allow perforation of the subchondral bone.


Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients with symptomatic single chondral lesions of the knee from 1 to 4 cm2.
  • Signed patient informed consent.
  • Agree to adhere to rehabilitation protocol.

Exclusion Criteria:

  • Inflammatory arthritis, septic arthritis, gout, pseudogout, Paget's disease, ochronosis, acromegaly, hemochromatosis, tumors, collagen mutations.
  • Total meniscectomy
  • Malalignment
  • Evidence of osteoarthritis
  Contacts and Locations
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Please refer to this study by its identifier: NCT01947374

National Institute of Rehabilitation
Mexico City, Mexico, 14389
Sponsors and Collaborators
Instituto Nacional de Rehabilitacion
National Council of Science and Technology, Mexico
Principal Investigator: Clemente Ibarra, M.D. INR
Study Chair: Luis G Ibarra, M.D. INR
Study Director: Enrique Villalobos, M.D. INR
Study Director: Aldo F Izaguirre, M.D. M.Sc. INR