A leaning bronze sculpture can be a serious concern for art collectors, museums, or public spaces. To effectively stabilize such artwork, consider these professional approaches:

1. Structural Assessment: First, evaluate the sculpture's base and internal structure. Bronze sculptures often develop leans due to foundation settling or internal armature weakening.

2. Base Reinforcement: For outdoor sculptures, improve the foundation by excavating around the base and pouring new concrete with steel reinforcements. Indoor pieces may need custom metal brackets.

3. Internal Bracing: Professional conservators can install stainless steel rods inside hollow bronze sculptures to redistribute weight and correct the lean without visible alterations.

4. Environmental Controls: Prevent future leaning by addressing environmental factors. Ensure proper drainage around outdoor sculptures and maintain stable humidity levels for indoor pieces.

5. Professional Restoration: For valuable artworks, consult a bronze conservation specialist. They may use techniques like thermal straightening or precision shimming to correct the lean while preserving patina.

6. Preventive Maintenance: Regularly inspect bronze sculptures for early signs of movement. Small adjustments made early can prevent major stabilization projects later.

Remember that bronze sculptures often develop a natural patina that contributes to their value. Any stabilization method should prioritize preserving this surface character while addressing structural issues. For significant artworks, always consult professional conservators to ensure proper treatment and long-term stability.