Your back popped when you stood up. Should you worry?

You push back from your desk after a long stretch of work, twist to grab your bag, and your lower back lets out a pop loud enough that someone else hears it. Nothing hurts. But you freeze for a second anyway, wondering if you just did something you'll regret.

Patients ask us about this all the time, usually on the way out the door from an appointment about something else. It deserves a real answer: what that pop actually is, why the same spot won't pop twice in a row, whether cracking causes arthritis, and which symptoms mean a noisy back needs a closer look.

The short answer, for most people: a painless pop is not damage.

---

What you should know

---

Why the same spot won't pop twice in a row

Try it and you'll notice the joint simply won't give you the sound again. The gas needs time to settle back into the fluid before it can happen again, and that reset takes a little while.

This matters for one practical reason. When people can't get the pop they want, they tend to twist harder. Forcing a joint past its comfortable range repeatedly can leave you sore or strained, so it's worth avoiding. The waiting period is just how the joint works, not a problem to solve.

Does cracking cause arthritis?

"My mother told me cracking causes arthritis." Someone told all of us that. Researchers have looked into it, mostly with knuckle cracking, and haven't found a link between the habit and arthritis.

One caution: that reassurance is about the everyday, gentle kind of cracking. It isn't a green light for forceful twisting of your own spine or neck, which carries different risks.

Does the pop mean the adjustment worked?

Many people judge hands-on treatment by whether they hear something. People tend to feel about the same afterward whether their back popped or stayed quiet.

So if you finish a hands-on care session without a sound effect, you weren't shortchanged.

If you're very flexible, your joints may just be louder

Some people crack constantly. They can put their palms flat on the floor with straight knees, and their elbows bend back past straight. Loose joints reach the end of their range more easily, which can mean more clicking through the spine and elsewhere.

Being flexible isn't a problem by itself, and many very flexible people never have trouble from it. It's worth a conversation if it comes with pain that keeps returning, joints that slip out of place, or frequent strains. For people in that group, building strength and control around the joints usually helps more than stretching.

Should you crack your own back?

If you twist gently in your chair and something pops on its own, we're not worried. Occasional cracking that takes no real force and causes no pain is a habit, not an injury.

What we'd steer you away from is the hard version: wrenching your torso, having someone bear-hug you off the ground, or yanking your own neck around to chase a sound. Skip forceful neck twisting entirely. In rare cases it has been linked to injury to the blood vessels in the neck.

Before any forceful manipulation, whether you do it yourself or someone does it for you, talk with a clinician first if any of these apply:

• Thin bones (osteoporosis) or a past fracture from a minor fall
• A recent fall, spine injury, or spine surgery
• Known or suspected cancer involving the spine
• Inflammatory arthritis affecting the spine
• New numbness, tingling, or weakness in an arm or leg
• Blood thinners or a bleeding disorder

What tends to help more than the pop

People who crack their backs all day usually feel the urge after holding one position too long, and the relief from a pop fades in minutes. Changing what your back does all day often helps more than chasing the sound. Try these for a few weeks:

• Get up and move for a minute or two every half hour or so during desk work
• Work on gentle twisting of the upper back, since a stiff upper back pushes extra motion into the low back
• Stretch the hips, which tighten with long hours of sitting
• Strengthen your core and hip muscles rather than only stretching
• Walk regularly, and use heat before activity if stiffness is your main complaint

Many people find the noise bothers them less once the stiffness behind it improves. If it doesn't change, or if pain is part of the picture, come in and we'll take a closer look.

Let's take a look at your back

A back that has always been noisy and has never hurt is one you can probably stop thinking about. If the sound now comes with pain, stiffness that limits your day, or anything traveling into a leg, we'd rather see you than leave you wondering.

Our team will examine how your spine moves, sort out what's driving the symptoms, and build a plan around what you're trying to get back to. Schedule Exam with Princeton Orthopaedic Associates and bring your questions with you.

This information is general education and is not a substitute for an individual evaluation.

This blog post is meant to be informative and should not act as a self-diagnosis tool. If you’d like to see one of our doctors, please contact us here.

A pop, fast swelling, and a knee that still walks

An ACL tear usually happens without contact: a plant and turn, an awkward landing, or a sudden stop. Many people feel or hear a pop, and the knee swells within a few hours. What catches them off guard is that they can often stand up and walk on it.

We see this pattern in our exam rooms almost every week, in athletes and in people who were only stepping off a curb. Clinicians typically follow same course: settle swelling, conduct a careful exam, image when needed, and start rehab before surgery decisions.

The short version? Walking on it proves very little. A knee that pops and then swells fast deserves an exam.

---

Quick answers first

• A pop during a twist, then swelling within a few hours, is one of the more telling patterns we see with an ACL tear.
• Fast swelling after a knee injury is often blood inside the joint, not ordinary puffiness. That's why the knee feels tight and full.
• Many people with a torn ACL can still walk. Being able to walk doesn't rule anything out.
• Most ACL injuries happen without contact, during cutting, pivoting, landing, or a hard stop.
• A cold, pale, blue, or numb foot, an obviously deformed knee, or a knee that may have dislocated, which usually means several ligaments tore at once, is an emergency. Go straight to the emergency department, because the popliteal artery and the nerves behind the knee can be injured.
• A knee stuck in a bent position that won't straighten is urgent rather than an emergency. It often means a bucket handle meniscus tear has flipped into the joint, and it should be seen within a day or two.
• ACL tears often come with a meniscus or cartilage injury, which is one reason imaging matters.
• Getting the swelling down and the quad muscle working before any surgery is part of the plan, not a delay.
• Growing kids and teens are handled differently than adults, and waiting it out has its own risks.
• Returning to pivoting sports is based on how the knee performs, not only on the calendar.

The first 48 hours at home

What you do in the first couple of days won't repair a ligament, but it can keep the knee calmer and make your exam more useful to us. The goal is simple: settle the swelling and pain, and avoid a second injury on a knee that can't protect itself yet. Here's how we'd coach a patient who called us from the parking lot after a game.

Do this now	Hold off on this
Ice the knee for roughly 15 to 20 minutes at a time, several times a day, with a thin towel against the skin	Testing the knee to see if it "still works"
Prop the leg up above heart level when you're sitting or lying down	Going back into the game or practice, even if the pain eases
Use a light compression sleeve or wrap if it feels better	Twisting, cutting, or pivoting on the leg
Use crutches if walking makes you limp or hitch	Hot tubs, heating pads, and deep massage in the first days
Gently bend and straighten the knee as tolerated so it doesn't stiffen up	Waiting weeks to be seen because the pain settled down
Call us to be examined	Guessing at the diagnosis from videos online

Over the counter anti inflammatory medicine is reasonable for many people, as long as it's safe for you. Check with your doctor or pharmacist first if you have kidney disease, a history of stomach ulcers or bleeding in the gut, heart failure, or blood pressure that isn't well controlled, if you take a blood thinner, or if you're pregnant.

Walking on it fools a lot of people

Plenty of patients who turn out to have a complete tear stand up and walk off the field.

Straight line walking on a flat floor doesn't ask much of the ACL. The ligament's job is controlling rotation and keeping the shin bone from sliding forward on the thigh bone, so the trouble shows up later, when you turn quickly, change direction, or step down off a stair. Patients describe the knee shifting or buckling. Others just say they don't trust it.

You'll hear the words partial and complete. A complete tear means the ligament is torn all the way through and no longer steadies the shin bone. A partial tear leaves some fibers attached, and a few of those knees stay stable enough for sport, while others start behaving like a complete tear once the swelling clears. The exam and the MRI together usually sort out which one you have.

There's another reason the early days can be misleading. Pain and swelling can shut the quadriceps down, so the thigh muscle stops firing the way it should, and that weakness lingers well after the knee stops hurting.

Injuries that feel like a torn ACL

A pop and a swollen knee can come from several different injuries, and more than you can happen at the same moment. The table below shows patterns we tend to see. Patterns aren't diagnoses, though, and sorting this out takes an exam, with imaging when it's needed.

Injury	What often stands out
ACL tear	Pop during a twist or landing, swelling within hours, the knee feels like it could give way when turning
Meniscus tear	Swelling that builds over a day or two, catching or locking, soreness along the joint line
Kneecap dislocation	The kneecap slides out of place and may pop back on its own, with pain and swelling across the front of the knee
MCL sprain	Pain along the inner side after the knee is pushed inward, with less swelling and often the ability to walk
Patellar or quadriceps tendon tear	Trouble straightening the knee or lifting the leg, and the kneecap may sit higher or lower than usual
Bone bruise or fracture	Sharp pain over bone, trouble putting any weight on the leg, swelling that comes on quickly

Prehab: the weeks before surgery count

If surgery is on the table, the time between the injury and the operating room isn't dead time. We use it.

Physical therapy before an ACL reconstruction, often called prehab, has a few clear jobs. Calm the swelling. Get the knee straightening fully again. Wake the quadriceps back up and rebuild strength in the hip and hamstring. Many patients who go into surgery with a quiet, mobile, stronger knee recover motion and strength more easily afterward, and a stiff, swollen knee at the time of surgery tends to stay stiff longer.

• Swelling control and full knee extension
• Quadriceps activation and strengthening
• Hamstring, glute, and calf strength
• Balance and body position awareness
• Walking normally again, without a limp
• Learning what the surgery and the first weeks after will involve

The research behind prehab is encouraging rather than settled. Study quality is moderate, so the benefit is best described as likely instead of certain. We still use those weeks, because there's little downside to arriving at surgery with a calmer, stronger knee.

Prehab helps patients who choose not to have surgery too. For some people, a strong, well trained knee handles daily life comfortably without a reconstruction, and that's a legitimate path we discuss openly.

Why the calendar alone can't clear you for sports

Patients ask for a date. We understand why, and we'd rather give you a target with honest conditions attached.

A graft needs many months to mature inside the knee. In the Delaware-Oslo ACL cohort, Grindem and colleagues reported in 2016 that reinjury risk dropped with each added month of delay up to about nine months, and athletes who went back before nine months had much higher reinjury rates. Time is only half of it. Strength and hop testing is usually expected to reach roughly 90 percent of the uninvolved leg, along with controlled landing, confident change of direction, and a knee that doesn't swell after hard sessions. Many competitive athletes need twelve months or longer.

Confidence belongs on that list too. Fear of reinjury keeps some athletes from returning even when the leg tests well, and it's worth naming and working on with your therapist rather than ignoring.

One more thing that surprises people: after an ACL reconstruction, the opposite knee carries real risk as well, especially in young athletes going back to pivoting sports. Rehab should train both legs.

The warm up that lowers your risk

Here's the part worth sharing with a coach. Structured warm up programs built around strength, balance, hopping, and landing and cutting technique have been studied across many sports. They've been shown to reduce lower body injuries, including ACL injuries, in athletes who do them consistently. The FIFA 11+ and the PEP program are the best studied examples. They run about 15 to 20 minutes, stand in for a normal warm up, and need little or no equipment, usually a ball and a few cones.

• Done as the team warm up, most practice days, all season
• Hip and hamstring strengthening, not just stretching
• Single leg balance work
• Jump and landing drills with the knees tracking over the toes, not caving inward
• Deceleration and cutting drills at controlled speed before full speed

Female athletes in cutting and pivoting sports tear the ACL at a notably higher rate than male athletes in the same sports. A good part of that gap is tied to muscle control and landing mechanics, and that's exactly what these warm up drills train, so part of the risk is trainable.

The honest catch is sticking with it. These programs work when teams do them routinely, and the benefit fades when the warm up gets skipped in a busy week.

Surgery or not: how we decide together

The American Academy of Orthopaedic Surgeons published a clinical practice guideline on ACL injuries in 2022, and it weighs how much growing is left, age, and activity level together rather than any one of them alone. Younger, more active patients are generally treated without long delay, while older, less active patients often do well without surgery. A seventy year old who plays doubles tennis four times a week and a thirty year old with a desk job and a treadmill are still two different conversations.

Several things get weighed together when we talk through your options, and none of them stands alone. How the knee behaves day to day matters as much as what the MRI shows, and what you want to get back to matters just as much as both. Here's what usually shapes the conversation:

• Whether the knee gives way during normal activity
• Whether the meniscus or cartilage is also injured
• The sports, work, and daily activities you want back
• Your age and how much growing is left, for younger patients
• How the knee responds to a course of physical therapy

For years the teaching was flat: a torn ACL doesn't knit back together. The picture has gotten more detailed. Some tears near the top of the ligament have shown signs of healing on MRI when the knee is braced early in a specific position, though that work is still being studied and isn't standard care for every patient yet.

The practical message hasn't changed much. Pain and swelling settle, plenty of people walk comfortably afterward, and the rotational stability needed for pivoting usually still has to be rebuilt, either through surgery or through serious, ongoing strength and control work. Structured rehab without surgery is a well studied path for selected patients, including many who are not heading back to pivoting sport.

Let's take a look at that knee

For most knee injuries like this, the first visit follows the same plan. We examine both knees, order an MRI when it's needed, and build a plan with you, and with your parents if you're a young athlete, that starts with swelling control and quad strength long before any decision about surgery.

Our sports medicine physicians, knee surgeons, and physical therapists work together at Princeton Orthopaedic Associates, so your exam, imaging, and rehab stay connected from the first visit through your return to the activities you care about. If your knee popped, swelled, or feels unreliable, schedule an exam with our team.

This blog post is meant to be informative and should not act as a self-diagnosis tool. If you’d like to see one of our doctors, please contact us here.

Shoulder pain myths we hear in clinic, and what's actually true

Shoulder pain collects bad advice faster than almost any other joint we treat. Friends hand out diagnoses, and the search results are usually worse. The same handful of beliefs come up week after week: what a scan can tell you, whether a rotator cuff tear means surgery, why frozen shoulder isn't your fault, what night pain means, and when shoulder pain isn't coming from the shoulder at all.

Reading about your shoulder never replaces an exam. It can, though, help you ask better questions.

---

The short version

That's why we read your images next to your story and your exam, never alone. X-rays show the bones and can spot calcium deposits. Ultrasound or MRI can help when we need a closer look at a tendon.

Myth: a rotator cuff tear always ends in surgery

Some tears do need repair. A tear that happens in a moment, from a fall or a hard pull, is different from a tendon that has frayed slowly over the years. If an injury leaves you suddenly unable to raise your arm, get it checked within days, not weeks, because timing can affect your repair options.

For the slow, wear-and-tear kind, we usually start with guided exercise and consider surgery only if you aren't improving after a few months. If pain is too strong for therapy, an injection may calm it down enough to get started. And an older surgery that shaved bone at the top of the shoulder for pinching pain generally hasn't worked better than exercise, so we rarely recommend it.

Non-surgical care isn't the same as doing nothing. A good plan includes:

• Exercises that steadily strengthen the rotator cuff and the muscles around the shoulder blade
• Short-term changes to overhead work and training rather than full rest
• An injection in some cases, to make therapy possible
• A set check-in, so you aren't left drifting without a decision
• Imaging only when the answer will change the plan

Myth: night pain just means you slept on it wrong

Position matters, but it isn't the only thing going on. Lying on the sore side presses on irritated tendons, and the joint stays still for hours, so swelling builds. Without the day's distractions, you notice the pain more. Night pain is common with rotator cuff problems.

A few changes at bedtime can help while you wait for your appointment:

• Sleep on your back instead of the painful side
• Tuck a pillow under the elbow so the arm isn't dangling
• If you side-sleep, lie on the good side and hug a pillow
• Try a recliner or a wedge during a bad flare
• Ice the shoulder in the evening for short sessions
• Ask your doctor before taking over-the-counter pain medicine, especially if you have kidney or heart problems, stomach ulcers, or take blood thinners

If pain wakes you several nights a week for more than a couple of weeks, come in. Losing sleep makes recovery harder.

Myth: if it hurts in your shoulder, the shoulder is the problem

Pain can travel. A pinched nerve in the neck can send pain, tingling or weakness down the arm. The gallbladder and liver can cause pain in the right shoulder or shoulder blade. And the heart can cause pain in the shoulder, arm, back, neck or jaw, on either side. In women, older adults and people with diabetes, heart symptoms often look unusual, so don't wait for classic left-arm pain before calling 911. One clue we look for: pain from somewhere else usually doesn't change when we move your shoulder.

When shoulder pain isn't an orthopaedic appointment

What you're noticing	What to do
Shoulder, arm, back, neck or jaw pain with chest pressure, shortness of breath, sweating, nausea or lightheadedness	Call 911. Don't drive yourself.
Sudden pain at the tip of the shoulder after a hit to the belly or chest, or with severe belly pain or faintness	Go to the emergency room
Shoulder or shoulder blade pain with sudden shortness of breath, coughing up blood or chest pain	Go to the emergency room
Right shoulder pain with upper right belly pain, fever, vomiting, or yellow skin or eyes	Get medical care the same day
A red, hot, swollen shoulder with fever	Get medical care the same day
New numbness or weakness down the arm, or you can't lift the arm after a fall	See us promptly
Pain that stays the same no matter how the shoulder moves	Get it checked; the cause may be outside the joint

Myth: if you can still lift your arm, nothing's torn

Plenty of people with tears lift their arm just fine, and plenty of people who can't lift it have no tear at all. In the exam room we look at the whole pattern: what you can do on your own, what happens when we move the arm for you, where exactly it hurts, and which positions set it off. That pattern tells us more than any single test, and it's the best reason to come in rather than guess.

What a shoulder visit with our team looks like

We start with how it began, because a shoulder that gave out during one lift tells a different story than one that has ached for months. Then we test motion, strength and the positions that bring on your pain. We often take X-rays the same day, and order other imaging only when it would change what we recommend.

It helps to jot down when the pain started, which motions trigger it, how often it wakes you, what you've already tried, and what you need your shoulder to do again.

Get your shoulder looked at

If your shoulder has been aching for a few weeks, waking you at night, or quietly changing how you reach and lift, we'd like to take a look. Our team will sort out what's driving the pain and build a plan around what you need your arm to do. Schedule Exam.

This blog post is meant to be informative and should not act as a self-diagnosis tool. If you’d like to see one of our doctors, please contact us here.