How Back Injuries Happen in Clarksville TN
People tend to call a back injury bad luck, and sometimes it is. A collision or a fall puts more load on the back than any tissue could absorb, and how you were standing had little to do with it. Most other back injuries follow mechanics that are reasonably well understood: how far from your body a load sits, how tired your muscles are, and how much work your back has been doing lately.
Here's how those injuries happen, and what the usual lifting advice is based on. No way of lifting makes a back injury impossible, but knowing the mechanics tells you where the load actually goes.
How does lifting injure your back?
The muscles that straighten your back attach close to the spine, so they work at a short lever, or moment arm. An object held away from your body sits at a long one. The turning load on your lower back is the object's weight multiplied by its distance from the spine, so how far out you hold something changes the load far more sharply than how heavy it is.
That one relationship explains most of the usual lifting advice. A load held close to the trunk has a shorter lever. Bending at the hips and knees hands the work to the hip and knee extensors, bigger muscles at longer moment arms than the spinal extensors. Storing things you handle often at waist height, instead of on the floor, takes out the deepest part of the reach.
Twisting adds to it. Turning under load adds rotation to the compression already there, in a part of the spine with little rotation to give compared with how far it bends forward and back.
Why do tired muscles matter in a back injury?
As your back muscles tire, they support the spine less, and the load they were carrying doesn't go anywhere. It moves onto the passive structures: ligament, joint capsule and disc. That's the mechanism behind a common story, a full day of lifting where nothing went wrong until the last few. By then the same load is riding on less muscle than it had that morning.
Weight still matters, though. Handling a heavy or awkward load is itself among the strongest measured triggers of a sudden episode of back pain. Fatigue stacks on top of that instead of replacing it.
Strain, sprain or disc: which kind of back injury is it?
- A strain injures muscle or tendon. It usually follows one specific loaded movement, it's felt in one spot, and it's sore both when the muscle contracts and when it stretches.
- A sprain injures ligament. Ligament has a poorer blood supply than muscle and generally takes longer to settle.
- A disc injury involves the structure between two vertebrae. When displaced disc material contacts a nerve root, symptoms follow the nerve down into the arm or leg instead of staying in the back. Our disc injury page goes through this in detail, along with the terms, which often get used loosely.
Some chiropractic ads talk about "spinal misalignment" as if it were a fourth kind of injury next to those three. We don't use it that way on this page. When we examine a hurt back, we're working out what may be behind your symptoms, and each of those three leaves different signs.
How your recent workload sets up a back injury
Tissue adapts to load over weeks. A new job, a moving day, getting back to training after a break, or a weekend of hard physical work for a body that's used to sitting: those are common histories behind a back injury, because the body had no recent preparation for them. The moment people remember is often where built-up load met that day's capacity, not the whole cause. The usual advice, to build load up gradually, is a reasonable inference from the mechanism, but trials haven't confirmed it.
How well conditioned your trunk muscles are is one of several things that change that capacity, and people with strong trunks still hurt their backs.
Which back injury symptoms need urgent care?
Get emergency medical care the same day for any of these:
- Loss of bladder or bowel control, or new difficulty passing urine
- A change in the sensation of passing urine, such as not feeling the flow, or losing the sense of when the bowel is full
- Numbness in the saddle area: the inner thighs, buttocks, or around the genitals
- New sexual dysfunction, including new numbness in the genitals
- New or worsening weakness in both legs
- Severe back pain with fever, or an unexplained fever with new back pain. Either alone is enough
A second group isn't on the emergency list, but it still shouldn't be waited out. Get a prompt medical review for new or progressing weakness in one leg, numbness that's spreading, back pain after significant trauma, or back pain with unexplained weight loss or a history of cancer.
What we do when you come in with a back injury
At your first visit you'll sit down with one of our chiropractors and go over what you were doing when it happened, what you felt, where it hurts, if the pain travels, and how it's changed since. The exam looks at how your joints move, where muscles are tight or swollen, and for signs of an irritated nerve, including your reflexes, sensation and strength where they're relevant.
We'll tell you what we find, including when it isn't something we treat. If we are not able to help you with your problem or are unable to reduce your pain levels, we will make sure to give you a recommendation to another experienced provider.
If anything in either list above applies, get that medical care first: for the emergency list, an emergency department, not us. Otherwise, if your back went during a move, at the end of a long day of lifting or in your first week back at training, call our Clarksville office. If you're new to us, here's what a first visit includes.
Follow the evidence
Research, with context.
Selected published sources behind what we've written, each with what it found and what it can't tell us. We give you both halves because no paper can diagnose you or predict how your own care will go.
Prevention of Low Back Pain: A Systematic Review and Meta-analysis
21 randomized trials involving 30,850 participants, examining interventions to prevent low-back pain.
What it foundExercise with education reduced the risk of a low-back-pain episode. Education alone, back belts and shoe insoles did not show a preventive effect.
What it can't tell usEvidence quality varied by intervention and outcome, and the search ended in 2014. It doesn't suggest every injury can be prevented, and it doesn't show that routine adjustments prevent back pain.
Publication details & citation
Steffens et al. Prevention of Low Back Pain: A Systematic Review and Meta-analysis. JAMA Internal Medicine. 2016. DOI: 10.1001/jamainternmed.2015.7431.
Read the publication recordExercise therapy for chronic low back pain
249 trials of exercise therapy in adults with chronic nonspecific low-back pain.
What it foundExercise probably improves pain compared with no treatment, usual care or placebo. Average improvements in function were smaller.
What it can't tell usThe programs, and what they were compared with, varied. The review doesn't point to one best exercise for everyone, and it doesn't apply to a new fracture, an infection or a neurological problem that's getting worse.
Publication details & citation
Hayden et al. Exercise therapy for chronic low back pain. Cochrane Database of Systematic Reviews. 2021. DOI: 10.1002/14651858.CD009790.pub2.
Read the publication record
Our editorial policy explains how to read these sources and what our clinical-review labels mean.