Bam Margera took a serious tumble while showing off his skateboarding skills — and we’ve got the clip of the exact moment it all went down.

Check it out … the pro skateboarder whizzes back and forth on the ramps, when suddenly, on one descent, his left leg lags behind … sending him hurtling towards the ground.

As you can see, the former “Jackass” star’s clearly in agony, letting out a loud “F***!” while writhing in pain on the ground. His buddy finds himself in a tough spot here … watching helplessly, unsure of what to do next or how serious Bam’s pain really is.

Turns out, it was quite bad … ’cause he headed straight to the hospital after the wipeout. But, he luckily managed to avoid surgery and only needed a knee brace and some crutches instead.

The skateboarder was also comforted by his fiancée Dannii Marie … who was by his side at the hospital. Looks like their love is still rolling strong!

Bam kept his fans in the loop … taking to IG to share the news of his MCL tear — which is essentially a stretch, partial tear, or complete tear of the medial collateral ligament.

Hopefully, he’ll kick his recovery into high gear and be back on his feet soon. Feel better!