Lower back muscle injury

Hey,

Long story short—I tore a muscle. The doctor I saw kept hinting it was my latissimus dorsi, though he never actually gave me a straight diagnosis. Based on how he acted and the fact that my ultrasound came back totally clear, it feels like he’s implying a tear. I definitely heard and felt that sickening pop when it happened. Right now, the area just below my shoulder blade is swollen as hell, and I can barely move my arm without intense pain.

To top it off, he told me it doesn't really matter what the exact damage is because the treatment is all the same: rest, ice, and Voltaren.

Naturally, once I got home and started Googling stuff about these kinds of injuries, I started freaking out a little.

So, I have a question: how often does this actually require surgery? I’m assuming if it were truly serious, he wouldn't have just sent me home to lie on the couch.

Honestly, how on earth did you manage to actually tear your latissimus dorsi? That’s a hell of a feat.
If I’m reading you right, you haven't actually gotten official confirmation yet regarding whether it's a full-on rupture or not, right?
I can't speak for your specific situation, but in my experience, it happens pretty frequently during certain workouts where people feel like their lat just "snaps." It results in this sudden, sharp localized pain—usually accompanied by some swelling—but without an actual tear. Usually, those things clear up in a couple of weeks if you just take it easy and use some local pain relief, like Luboreta, Voltaren Spray, Diclofenac Gel, Motrin Gel, or Voltaren gel.
The thing is, if you’ve actually torn the muscle, those topical stuff like gels and sprays usually won't touch the pain, and you're looking at dealing with it for months...

Thanks, velvetmoose9.

Clearly I failed. You described it better than I could—that sensation of skipping right over some kind of "hitch." The pain isn't unbearable; it's negligible while I'm resting, and I don't even need meds for it.

I have a diagnosis. The last line reads: "no signs of acute trauma," but the doctor left me confused. I got the feeling he doesn't agree with his colleague's ultrasound findings.

Look, if you’d actually ruptured your latissimus, you wouldn't be having this conversation right now—you'd be too busy screaming in agony just trying to breathe, sit, or lie down...
Since you've got all that myeloise going on in your back (or maybe even some fibrosis??), it honestly makes a lot of sense to start applying gels locally as soon as you can, followed by some proper medical massage once things settle down a bit.
Seriously though, just ask your doctor to clear up whether there's underlying myeloise present and what kind of therapy would actually work best for your specific situation 😉 If you don't mind me asking, what EXACT movement or action triggered that pain you described?