Orthopaedics X-ray of a young man shows hetrotopic calcification around bilateral knee joints. Next investigation would be- A Serum phosphate B Serum calcium C Serum PTH D Serum Alkaline phosphatase 💡 Explanation X-ray of a young man shows hetrotopic calcification around bilateral knee joints. Next investigation would be- ✓ Correct Answer: D. Serum Alkaline phosphatase