Fig. 4From: Treatment of critically sized femoral defects with recombinant BMP-2 delivered by a modified mPEG-PLGA biodegradable thermosensitive hydrogelChanges in the pH of mPEG-PLGA and BOX hydrogels before and after degradation. The pH of mPEG-PLGA and BOX hydrogel copolymers was measured after immersion in PBS (a), saline (b) or distilled water (c) for 0, 1, 2 and 4 weeks. *P < 0.05, the statistical comparisons for BOX hydrogel versus mPEG-PLGA hydrogelBack to article page