What happened

Vericel (VCEL 0.07%) was a big hit on an otherwise forgettable Thursday for the stock market, closing the day up more than 13%. This followed the news that the company has been tipped for inclusion in an important stock index.

So what

Late Wednesday, S&P Dow Jones Indices announced that Vericel is to become a component of its S&P SmallCap 600 index. It replaces energy company QEP Resources, which is being acquired by Diamondback Energy. The switch takes effect before market open on Monday, March 22.

Athlete stretching on a track.

Vericel, whose MACI treats cartilage defects in the knee, is joining an important stock index. Image source: Getty Images.

While inclusion on a relatively high-profile index is certainly an achievement, it's important to remember that it barely affects the fundamentals of a company, if at all. It does increase its prominence among investors and makes it a target of the armies of index funds that trawl such listings for their portfolios. But in the end, research indicates that the "index effect" is short-lived at best.

On top of that, Vericel is a discovered stock on the back of very optimistic guidance for 2021 and the success of its distinctive MACI, a drug that treats cartilage defects in the knee. As such, its share price has risen more than sixfold over the past year.

Now what

That said, Vericel remains a healthcare company to watch. Its work is based on cell therapy, a promising area of care in which whole cells are transplanted into patients to help them heal from a variety of afflictions. We'll certainly hear more from Vericel in the coming months and years.