The 36-year-old infielder says he still hasn't decided whether he'll resume his playing career, but he was eager to show off his scar.
The noticeably thinner Boone has dropped about 15 pounds since the March 26 surgery and says he feels good.
Boone had surgery to replace a bicuspid aortic valve after he was diagnosed with a congenital defect in his heart. His heart's aortic valve had two cusps to manage blood flow instead of the normal three.
Boone says he's thought a lot about his future in recent weeks but says he's "certainly not cashing it in yet."
The Astros celebrated Boone's recovery on the same day they learned hitting coach Sean Berry has what doctors believe is a cancerous tumor on his kidney.
Notes: Astros ace Roy Oswalt expects to make his next scheduled start on Sunday despite a bone bruise on his right index finger. Oswalt said X-rays revealed no damage, but he may skip his bullpen session Thursday to recover from the injury that occurred while he was batting on Tuesday against Washington. ... The Astros recalled RHP Alberto Arias from Triple-A Round Rock and designated IF Jason Smith for assignment.