Endothelialized callus organoids drive rapid regeneration of critical-size segmental long bone defects.

Endothelialized callus organoids enable rapid regeneration of large long bone defects in mice, achieving functional repair within a short timeframe.

• Why it matters: Large bone defects are difficult to treat with current methods, which often fail to restore full functionality, highlighting the need for improved regenerative strategies.
• What they did: Scientists engineered human endothelialized callus organoids by co-culturing skeletal progenitors with endothelial cells, creating callus-like structures that promote bone regeneration.
• The result: These organoids supported swift vascularization and bone healing in mice, acting as temporary templates that facilitate host-driven regeneration and functional recovery.