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Fig. 2 | BMC Musculoskeletal Disorders

Fig. 2

From: Quantitative analysis of near-implant magnesium accumulation for a Si-containing coated AZ31 cage from a goat cervical spine fusion model

Fig. 2

Mg concentrations (recorded in ppm*104) and corresponding Ca/P ratios recorded at 3, 6, 12 and 24 weeks post-operatively are presented. Data represent mean ± s.d, n = 3 goats. a At 3 weeks post-operatively, Mg concentrations was higher in spots that were closer to the cage and resulted in lower Ca/P ratios. (all P>0.05). b, c At 6 and 12 weeks post-operatively, Mg concentrations was still higher in spots that were closer to the cage, but Mg began to be uniformly distributed since no differences were observed between those at 4 mm, 5 mm and PB (12 weeks, all P>0.05). Ca/P ratios were uniformly distributed (all P>0.05) and were much lower than the basal level at 12 weeks post-operatively (P<0.001). d At 24 weeks post-operatively, Mg was uniformly distributed (P = 0.158) but was still higher than the basal level (P<0.001). Ca/P ratios were uniformly distributed (P = 0.071) and were much lower than the basal level (P = 0.02). e Mg was highest at 3 weeks post-operatively, especially in the spots which were more closer to the cage (1 mm, 2 mm, 3 mm, all P<0.05); From 6 weeks to 12 weeks post-operatively, Mg level persisted at a relatively high level; Mg decreased to a significantly low level at 24 weeks post-operatively. f Ca/P ratio was the lowest at 3 weeks post-operatively, especially in the spots which were more closer to the cage (1 mm, 2 mm, 3 mm, 4 mm all P<0.05). With the Mg levels decreasing, Ca/P ratios increased but finally decreased to a relatively low level at 12 and 24 weeks post-operatively

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