NEW YORK ( TheStreet) -- MAKO Surgical Corporation (Nasdaq: MAKO) is trading at unusually high volume Thursday with 4.5 million shares changing hands. It is currently at four times its average daily volume and trading down $1.70 (-6.5%) at $24.27 as of 4 p.m. ET. MAKO Surgical has a market cap of $1.12 billion and is part of the health care sector and health services industry. Shares are up 4.2% year to date as of the close of trading on Wednesday. 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. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.