J Knee Surg 2016; 29(06): 443-450
DOI: 10.1055/s-0035-1569481
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Cryopreserved Amniotic Suspension for the Treatment of Knee Osteoarthritis

Jeremy B. Vines
1  Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama
2  NuTech Medical—Research and Development, Birmingham, Alabama
Antonios O. Aliprantis
3  Division of Rheumatology, Immunology and Allergy, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
Andreas H. Gomoll
4  Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Massachusetts
Jack Farr
5  OrthoIndy—Cartilage Restoration Center, Greenwood, Indiana
› Author Affiliations
Further Information

Publication History

05 May 2015

20 October 2015

Publication Date:
18 December 2015 (online)


There are few treatment options for symptomatic knee osteoarthritis (OA). Human amniotic suspension allografts (ASA) have anti-inflammatory and chondroregenerative potential and thus represent a promising treatment strategy. In anticipation of a large, placebo-controlled trial of intra-articular ASA for symptomatic knee OA, an open-label prospective feasibility study was performed. Six patients with Kellgren–Lawrence grades 3 and 4 tibiofemoral knee OA were administered a single intra-articular ASA injection containing cryopreserved particulated human amnion and amniotic fluid cells. Patients were followed for 12 months after treatment. No significant injection reactions were noted. Compared with baseline there were (1) no significant effect of the ASA injection on blood cell counts, lymphocyte subsets, or inflammatory markers and (2) a small, but statistically significant increase in serum IgG and IgE levels. Patient-reported outcomes including International Knee Documentation Committee, Knee Injury and Osteoarthritis Outcome, and Single Assessment Numeric Evaluation scores were collected throughout the study and evaluated for up to 12 months. Overall, this study demonstrates the feasibility of a single intra-articular injection of ASA for the treatment of knee OA and provides the foundation for a large placebo-controlled trial of intra-articular ASA for symptomatic knee OA.