Evaluation of multiphase implants for repair of focal osteochondral defects in goats

被引:206
作者
Niederauer, GG
Slivka, MA
Leatherbury, NC
Korvick, DL
Harroff, HH
Ehler, WC
Dunn, CJ
Kieswetter, K
机构
[1] OsteoBiol Inc, San Antonio, TX 78249 USA
[2] Univ Texas, Hlth Sci Ctr, Dept Lab Anim Resources, San Antonio, TX 78284 USA
[3] Wilford Hall USAF Med Ctr, Lab Anim Resources Div, Lackland AFB, TX 78236 USA
[4] CJD Pharmacol Consultants LC, Richland, MI 49083 USA
关键词
(4-6) cartilage repair; resorbable polymer; ceramic; osteochondral; tissue engineering; mechanics;
D O I
10.1016/S0142-9612(00)00124-1
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The use of biodegradable scaffolds for articular cartilage repair has been investigated by numerous researchers. The objective of this screening study was to examine how the mechanical and physical properties of four multiphase implants can affect the cartilage healing response. Multiphase implant prototypes were prepared using poly(D,L)lactide-co-glycolide as the base material. PGA fibers (FR), 45S5 Bioglass(R) (BG) and medical grade calcium sulfate (MGCS) were used as additives to vary stiffness and chemical properties. Osteochondral defects (3 mm dia. and 4 mm in depth) were created bilaterally in the medial femoral condyle thigh-weight bearing) and the distal medial portion of the patellar groove (low-weight bearing) of 16 Spanish goats. Half of the implants were loaded with autologous costochondral chondrocytes. Defect sites (total n = 64, 4 sites/treatment) were randomly treated and allowed to heal for 16 weeks, fully weight bearing. At euthanasia, gross evaluations and biomechanical testing were conducted. Histological sections of the defect sites were stained with H and E, Safranin O/Fast Green or processed to analyze collagen architecture. Sections were semi-quantitatively scored for repair tissue structure. Qualitative evaluations showed that all groups had a high percentage of hyaline cartilage and good bony restoration, with new tissue integrating well with the native cartilage. Gross and histology scoring indicated a significantly higher score for defect healing in the condyle than in the patellar groove, but no difference in heating for implant types or addition/omission of cells was found. This investigation demonstrates that focal, osteochondral defects in caprine distal femurs treated with various implant constructs were repaired with hyaline-like cartilage and good underlying bone. The multiphase implants show potential for treatment of osteochondral defects and long-term studies need to be undertaken to confirm the longevity of the regenerated tissue. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2561 / 2574
页数:14
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