Dae-Hee Lee1, Joanne Ng2, Jong-Won Chung3, Chung Hee Sonn2, Kyung-Mi Lee4, Seung-Beom Han5. 1. Department of Orthopedic Surgery, Korea University College of Medicine, Seoul, Korea. 2. Department of Biochemistry and Molecular Biology, Division of Brain Korea 21 Program for Biomedical Science, Korea University College of Medicine, Seoul, Korea. 3. Barunmadi Orthopedics, Seongnam, Gyeonggi-do, Korea. 4. Department of Biochemistry and Molecular Biology, Division of Brain Korea 21 Program for Biomedical Science, Korea University College of Medicine, Seoul, Korea. Electronic address: kyunglee@korea.ac.kr. 5. Department of Orthopedic Surgery, Korea University College of Medicine, Seoul, Korea. Electronic address: oshan@korea.ac.kr.
Abstract
BACKGROUND AIMS: The graft-healing potential of mesenchymal stromal cells (MSCs) derived from the remnants of ruptured anterior cruciate ligaments (ACLs) after ACL reconstruction may depend on the chronicity of the injury. The aim of this study was to assess the quantitative and phenotypic differences between MSCs isolated from ACL remnants in patients with (sub)acute and chronic tearing. METHODS: Torn ACL remnants were harvested during ACL reconstruction from 41 patients, 24 with (sub)acute ACL (<6 months from injury to surgery) and 17 with chronic ACL (time interval >6 months) tears. MSCs isolated from these samples were assessed for quantitative and phenotypic differences, and the correlation between the proportion of MSCs and the chronicity of ACL tear was evaluated. RESULTS: At passage 0, the mean proportion of MSCs (CD34(-), CD44(+), CD90(+) and CD105(+)) was higher in (sub)acute than in chronic ACL tear samples (20.69% ± 7.82% versus 9.85% ± 8.01%, P < 0.001). At passages 1 and 2, however, MSC proportions did not differ significantly in the two groups. Time interval showed a negative correlation with MSC proportion only at passage 0 (r = -0.505, P < 0.001). The optimal cutoff value for time from injury to surgery yielding <10% freshly isolated ACL-MSCs, a percentage expected to have low tissue healing potential, was 23.5 months. CONCLUSIONS: The proportion of freshly isolated MSCs was higher in samples from patients with (sub)acute tearing than in chronic ACL tearing and negatively correlated with the time interval between trauma and surgery.
BACKGROUND AIMS: The graft-healing potential of mesenchymal stromal cells (MSCs) derived from the remnants of ruptured anterior cruciate ligaments (ACLs) after ACL reconstruction may depend on the chronicity of the injury. The aim of this study was to assess the quantitative and phenotypic differences between MSCs isolated from ACL remnants in patients with (sub)acute and chronic tearing. METHODS: Torn ACL remnants were harvested during ACL reconstruction from 41 patients, 24 with (sub)acute ACL (<6 months from injury to surgery) and 17 with chronic ACL (time interval >6 months) tears. MSCs isolated from these samples were assessed for quantitative and phenotypic differences, and the correlation between the proportion of MSCs and the chronicity of ACL tear was evaluated. RESULTS: At passage 0, the mean proportion of MSCs (CD34(-), CD44(+), CD90(+) and CD105(+)) was higher in (sub)acute than in chronic ACL tear samples (20.69% ± 7.82% versus 9.85% ± 8.01%, P < 0.001). At passages 1 and 2, however, MSC proportions did not differ significantly in the two groups. Time interval showed a negative correlation with MSC proportion only at passage 0 (r = -0.505, P < 0.001). The optimal cutoff value for time from injury to surgery yielding <10% freshly isolated ACL-MSCs, a percentage expected to have low tissue healing potential, was 23.5 months. CONCLUSIONS: The proportion of freshly isolated MSCs was higher in samples from patients with (sub)acute tearing than in chronic ACL tearing and negatively correlated with the time interval between trauma and surgery.
Authors: Carlos Eduardo da Silveira Franciozi; Sheila Jean McNeill Ingham; Guilherme Conforto Gracitelli; Marcus Vinicius Malheiros Luzo; Freddie H Fu; Rene Jorge Abdalla Journal: Curr Rev Musculoskelet Med Date: 2014-09
Authors: Marcus Vinicius Malheiros Luzo; Carlos Eduardo da Silveira Franciozi; Fernando Cury Rezende; Guilherme Conforto Gracitelli; Pedro Debieux; Moisés Cohen Journal: Rev Bras Ortop Date: 2016-06-06