NEW YORK ( TheStreet) -- Shares of MAKO Surgical Corporation (Nasdaq: MAKO) were gapping down Tuesday morning with an open price 29.9% lower than Monday's closing price. The stock closed at $41.40 Monday and opened today's trading at $29.02. The average volume for MAKO Surgical has been 921,100 shares per day over the past 30 days. MAKO Surgical has a market cap of $1.69 billion and is part of the health care sector and health services industry. Shares are up 57.4% year to date as of the close of trading on Monday. MAKO Surgical Corp., a medical device company, markets its advanced robotic arm solution and orthopedic implants for orthopedic procedures in the United States and internationally. TheStreet Ratings rates MAKO Surgical as a sell. The company's weaknesses can be seen in multiple areas, such as its disappointing return on equity and weak operating cash flow. You can view the full MAKO Surgical Ratings Report. Get more investment ideas from our investment research center.