Histomorphometry of distraction osteogenesis in a caprine tibial lengthening model

被引:52
|
作者
Welch, RD
Birch, JG
Makarov, MR
Samchukov, ML
机构
[1] Texas Scottish Rite Hosp Children, Res Dept, Dallas, TX 75219 USA
[2] Texas Scottish Rite Hosp Children, Dept Pediat Orthopaed, Dallas, TX 75219 USA
[3] Texas Scottish Rite Hosp Children, Dept Neurol, Dallas, TX 75219 USA
关键词
D O I
10.1359/jbmr.1998.13.1.1
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Standardized histomorphometry of bone formation and remodelling during distraction osteogenesis (DO) has not been well characterized, Increasing the rhythm or number of incremental lengthenings performed per day is reported to enhance bone formation during limb lengthening, In 17 skeletally immature goats, unilateral tibial lengthenings to 20 or 30% of original length were performed at a rate of 0.75 mm/day and rhythms of 1, 4, or 720 times per day using standard Ilizarov external fixation and an autodistractor system, Two additional animals underwent frame application and osteotomy without lengthening and served as osteotomy healing controls, Histomorphometric indices were measured at predetermined regions from undecalcified tibial specimens, Within the distraction region, bone formation and remodelling activity were location dependent, Intramembranous bone formed linearly oriented columns of interconnecting trabecular plates of woven and lamellar type bone. Total new bone volume and bone formation indices were significantly increased within the distraction and osteotomy callus regions (Tb.BV/TV, 226% [p < 0.05]; BFR/BS, 235-650% [p < 0.01]) respectively, compared with control metaphyseal bone, Bone formation indices were greatest adjacent to the mineralization zones at the center of the distraction gap; mineral apposition rate 96% (p < 0.01); mineralized bone surfaces 277% [p < 0.001]); osteoblast surfaces 359% [p < 0.001]); and bone formation rate (650% [p < 0.01]), There was no significant difference (p < 0.14; R = 0.4) in the bone formation rate of the distracted callus compared with the osteotomy control callus. Within the original cortices of the lengthened tibiae, bone remodelling indices were significantly increased compared with osteotomy controls; activation frequency (200% [p < 0.05]); osteoclast surfaces (295% [p < 0.01]); erosion period (75%); porosity (240% [p < 0.001]). Neither the rhythm of distraction nor the percent lengthening appeared to significantly influence any morphometric parameter evaluated. Distraction osteogenesis shares many features of normal fracture gap healing, The enhanced bone formation and remodelling appeared to result more hom increased recruitment and activation of bone forming and resorbing cells rather than from an increased level of individual cellular activity.
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页码:1 / 9
页数:9
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