Shoulder Pain After a Car Accident: Why It Happens, Why It Shows Up Late, and How to Fully Recover

By Dr. Anatoliy Vergulyanets, DC, Dr. Verg Chiropractic (Vancouver, WA and Clackamas, OR)

It is not uncommon to injure a shoulder in a car accident, and those injuries are often missed or misdiagnosed. In large studies of whiplash patients, about 22% to 24% report distinct shoulder pain. In my office, the shoulder is one of the most common complaints I see after a crash, and very often it is tangled up with the neck, the upper ribs and the shoulder blade. This article explains how shoulders get hurt in a collision, why the pain can start days or even weeks later, when an MRI makes sense, and what it takes not just to feel better, but to stay better.

How Can a Shoulder Be Injured in a Car Accident?

Shoulder injury or pain after a crash usually happens through three main pathways.

1. Direct mechanical trauma. The shoulder can strike the door, window or other parts of the vehicle interior. The diagonal strap of a three-point seat belt also exerts a strong diagonal force across the shoulder. I regularly see seat belt bruising across the shoulder and neck in my patients.

2. Traction from gripping the wheel or bracing. Most drivers grip the steering wheel tightly at the moment of impact. As the vehicle is thrust forward or side to side beneath the occupant, that grip causes a violent stretch of the arm, pulling on the shoulder joint and accentuating the whiplash of the neck. At the same time the torso loads back into the seat padding, which can give 4 to 7 inches. Passengers do the same thing when they brace against the dashboard or reach out suddenly. One of my patients was rear-ended at a red light with his hand on the handbrake, and the force was so strong the handbrake handle came off in his hand. He came in with immediate sharp shoulder pain. Another patient was a mother who, at the moment of the crash, twisted and reached back with her right arm to protect her son in the back seat. Her shoulder took the force of that reach.

As I explain to my patients: we want to catch and document the injury, because when we are holding onto the steering wheel, the sudden movement of our body makes us tense very strongly to hold ourselves in place, and tissue tears.

3. Referred pain from the neck. Not all shoulder pain comes from the shoulder. About 12.3% of post-whiplash shoulder pain, in patients without local impingement, is referred pain from injured structures in the lower neck: the cervical discs, the facet joints or the ligaments, most commonly at C5 to C6. The nerves that supply the shoulder and arm start in the neck, so an injured neck can make the shoulder hurt even when the shoulder joint itself is fine. The upper ribs can do the same thing. When those rib joints become locked, symptoms can radiate up into the neck and into the shoulder.

How Common Is Shoulder Pain After a Crash, and Why Does It Matter?

• 22% to 24% of whiplash patients report shoulder pain.
• 9% develop true subacromial impingement syndrome (Chauhan & Turner, 2003, 524 whiplash patients), and most showed abnormal shoulder blade movement.
• Up to 53% develop periarticular shoulder disorders, such as inflammation of the rotator cuff tendons (Magnússon, 1994).
• 12.3% of shoulder complaints without local impingement are referred from the lower neck.
• 75% of people with thoracic outlet syndrome have shoulder pain, and crashes can trigger it through scalene muscle spasm and stretching of the brachial plexus.

It matters because shoulder and arm pain is a warning sign for long-term problems. Across several prospective studies (Pobereskin 2005, Hartling 2002, Suissa 2001), pain or numbness in the shoulder and arm early after a crash was an independent predictor of chronic whiplash disability, raising the risk by roughly 2.2 times. Long-term follow-ups show that 30% to 50% or more of crash victims develop persistent pain, and in one 17-year follow-up (Bunketorp et al.), 55% still had chronic pain, with radiating shoulder and arm pain among the most common symptoms. Dr. Arthur Croft [1] estimates that 6.2% to 9.6% of the general population lives with chronic post-traumatic neck and shoulder pain.

How Can the Pain Start Way After the Car Accident? Delayed Onset

One of the most common things I hear is, “My shoulder didn’t hurt in the ER.” That is normal. Shoulder complaints after a crash characteristically show up several days, weeks or even months after the collision. In Chauhan and Turner’s study, every one of the shoulder complaints was delayed in onset. In Magnússon’s study, the shoulder disorders appeared months after the trauma.

I see this pattern constantly:

• A young man who was T-boned felt his low back first, and his right shoulder pain came on over the following days, until his neck, upper back and shoulder formed a painful “triangle.”
• A woman whose car was hit on the side felt fine at first, and her shoulder and neck pain built up over about three days.
• A woman struck by a car mirror had negative shoulder X-rays in the ER, and her pain increased as the adrenaline wore off.
• A 70-year-old woman had a first CT that was read as clear, and a second CT 5 to 7 days later found rib fractures. A hairline fracture can take that long to become visible.

Why does this happen?

• Micro-tears progress. Small, partial tears in the shoulder ligaments, rotator cuff, scalene muscles or brachial plexus do not always cause immediate pain. Instead they start a slow inflammatory process, followed by guarding, muscle imbalance and scarring (fibrosis), including around the nerves, that gradually becomes a real clinical problem.
• Ligaments heal slowly and feel different. Ligaments and the joint capsule have much less blood supply than muscle; only the spinal discs have less. That is why they heal slowly and why a ligament injury often feels like deep stiffness and soreness rather than sharp pain. I tell patients that ligament injuries can be delayed in onset, can gradually get worse, and may not heal as readily, so we need to be careful.
• Referred pain builds over time. As abnormal motion and protective muscle guarding set in around an injured lower neck, the referred shoulder pain can intensify.
• Old weak spots get switched on. A crash can turn a previously quiet problem, such as a mildly deconditioned tendon, into an active, painful one. Injuries tend to land on our pre-existing weak links.
• Load reveals the injury. Pain may not show up until you return to lifting, overhead work, the gym or your kids. A low-demand week can hide a deficit that appears as soon as real load returns.
• Altered movement patterns change how the shoulder works. After a crash, pain, inflammation and protective guarding change the way we move. The muscles that steer the shoulder blade, especially the trapezius, can shut down or tighten up, and the shoulder blade stops moving in step with the arm. One way we evaluate this is scapulohumeral rhythm: the coordinated motion of the arm in its socket and the shoulder blade gliding on the rib cage as you raise your arm. When that rhythm is off, the shoulder blade does not rotate and tilt enough, the space at the top of the shoulder narrows, and the rotator cuff tendons get pinched and overworked with every reach. Each repetition adds a little more irritation, so inflammation and injury build up over weeks instead of showing up on day one. In Chauhan and Turner’s study, most of the whiplash patients who developed impingement showed abnormal scapulohumeral rhythm. Shoulder position sense is also impaired after whiplash, so the body has a harder time correcting these faulty patterns on its own. That is why I watch how the shoulder blade moves, not just how far the arm goes.

Load-induced exacerbation. This last point deserves its own name. Many of my patients feel “pretty good” while resting, and the shoulder flares when they carry groceries, lift a toddler, reach into cupboards, use a computer mouse all day or go back to heavy work. One patient told me the mouse was to blame. I reminded her that she used a mouse before the crash; the mouse is not the injury, it is just revealing it.

The Three Stages of Tissue Healing

Phase	Also called	Typical length	What the body is doing
Acute	Inflammatory phase	0 to 4–7 days	Clotting and inflammation to clear damaged cells and debris
Subacute	Repair (fibroblastic) phase	3–4 days up to 3–6 weeks	Laying down new, immature (Type III) collagen and new small blood vessels
Remodeling	Maturation phase	3 weeks to 1–2+ years	Converting to stronger Type I collagen and aligning fibers along the lines of stress

The remodeling phase is the one people forget. It can last a year or more, and how the tissue is loaded during that time decides whether it heals strong and flexible or stiff and scarred.

Why this matters for your claim. Insurers and defense experts often try to deny shoulder care when the shoulder was not written down in the ER notes. Dr. Croft’s work [1] emphasizes that delayed onset is the expected pattern for soft tissue shoulder injury, thoracic outlet syndrome and referred pain from the neck. Emergency staff are focused on ruling out life-threatening injuries and fractures, and they see you before most shoulder symptoms have developed.

Why Should a Chiropractor Evaluate Your Shoulder After a Car Accident?

A thorough evaluation looks at the shoulder and everything around it

Before any treatment, the first job is to find out what is actually injured. In my office, a post-crash shoulder evaluation includes:

• Shoulder range of motion, including passive internal rotation, which is best tested lying on your back
• Passive internal and external rotation of the shoulder, lying on your back, while the front of the shoulder is stabilized. This is one of the most important checks for a ligament injury of the shoulder. Holding the front of the shoulder steady keeps the shoulder blade and the rest of the body from compensating, so the rotation isolates the joint capsule and its ligaments. Pain, stiffness or lost range in this position points to an injured capsule or ligaments, even when the arm still lifts overhead normally.
• Neck range of motion, and whether neck movements reproduce the shoulder pain
• Strength of the deltoid, the rotator cuff (supraspinatus, internal and external rotators) and grip strength
• Joint movement of the shoulder joint itself, the AC and SC joints, clavicle rotation and the upper ribs
• Scapulohumeral rhythm, meaning how the shoulder blade and arm move together
• Orthopedic tests such as Neer’s impingement test, and the clunk and crank tests for the labrum
• Nerve tension tests of the arm, and the “doorbell sign,” which is pressure on the side or front of the neck that sends pain into the shoulder. This is a very commonly missed referral pattern, because the pain is not coming from the back of the neck but from the side or front of it.
• Palpation for trigger points in the front of the shoulder, the deltoid and the biceps tendon

A simple way to know whether your shoulder was examined properly: did the practitioner press on all areas of the shoulder, front, top, side and back, put the shoulder in all kinds of positions, and move your neck in a variety of ways? If not, the source of your pain may have been missed. A chiropractor is trained to determine where the pain is really coming from, whether it is neurologic or sclerotogenic referral, because even when the shoulder is not the primary injury, other areas can send pain there.

Specialized training in whiplash and soft tissue injury

Chiropractors receive extensive training in spinal and shoulder joint biomechanics, shoulder blade and arm motion, and soft tissue injury. Dr. Croft [1] notes that general practitioners and medical residents often receive relatively little instruction in detailed musculoskeletal disorders and low-speed crash injuries. In surveys, many primary care physicians expressed negative feelings toward managing whiplash or believed there was “nothing physically wrong” with chronic crash patients.

The ER and your family doctor are not designed for delayed shoulder trauma

The emergency room’s job is acute, life-threatening triage: ruling out gross fractures and dislocations. It is not set up for definitive soft tissue care, and it sees you before the delayed shoulder problems such as rotator cuff inflammation, impingement or thoracic outlet syndrome have appeared. Standard three-view X-rays cannot show partial soft tissue or ligament injury, or abnormal joint motion. A chiropractic evaluation adds dynamic motion testing, posture analysis, trigger point palpation and functional joint assessment.

Many of my patients arrive after being told everything was fine. One man could not raise his arm after his crash; urgent care told him nothing was wrong and took no imaging. When we examined him, his shoulder had a painful “clunk” and limited rotation.

Results, including for people who did not improve elsewhere

Clinical studies by Woodward et al. and Khan et al. found that chiropractic care improved 93% of chronic whiplash patients who had not responded to conventional medical treatment. Comparative trials show spinal and joint manipulation to be significantly more effective than prescription medication, acupuncture or advice alone for chronic spinal and joint pain. Chiropractic care also avoids reliance on opioids, anti-inflammatories and surgery, which carry their own risks and costs without correcting the joint problem underneath.

Restoring motion instead of masking symptoms

Soft collars, bed rest and muscle relaxants have been shown to prolong disability and delay recovery. In my opinion immobilization is beneficial only with segmental non painful mobilization (i.e. chiropractic and manual therapy). Chiropractors use active mobilization, adjustments and soft tissue therapy to break up scar tissue, restore normal shoulder blade and arm rhythm, and correct the abnormal muscle and position-sense reflexes set off by the collision.

Why Is My Shoulder Pain After a Car Accident Not Improving With Treatment?

Did your practitioner determine what structure is injured?

Treatment that is not aimed at the right structure rarely works. Common post-crash diagnoses include:

• Impingement syndrome, seen in about 9% of crash patients
• Periarticular shoulder disorders, up to 53%, meaning inflammation of the rotator cuff or the tissues around the joint
• Abnormal scapulohumeral rhythm, where the shoulder blade and arm no longer move together, with the trapezius muscle playing a central role
• Thoracic outlet syndrome, compression or violent stretching of the brachial plexus and scalene muscles
• Brachial plexus injury, stretching of the nerve network to the arm, causing shoulder and arm weakness or radiating abnormal sensations
• Rotator cuff and labral tears, partial or full
• Referred pain from the neck discs, facet joints and nerves, or from the upper ribs

Other sources of shoulder-region pain after a crash include direct impact and bruising, muscle and ligament strain, rotator cuff irritation, cervical sprain and strain, irritation of the cervical discs or nerves, and muscle pain around the trapezius and shoulder blade.

Case example: the neck was the real problem. A mother of four in her 30s was stopped and waiting to turn when another car was pushed into her. She saw it coming and tensed with both hands on the wheel. Her posture felt off the next day and her neck and shoulder pain started within a few days. Her shoulder felt “stuck,” she could not lift her toddler, and 15 minutes of washing dishes brought on neck and shoulder pain, with weekly migraines and hand tingling. Before she came to us she had 8 chiropractic visits and 6 massages elsewhere and rated herself about 30% better. When we examined her, it became clear that the shoulders were not the primary source of the problem; the neck was. After 4 visits in our office (plus massage), she was about 60% better. Her shoulder range of motion was normal, the impingement test was negative, her rotator cuff tested 5/5 without pain, and her headaches dropped from four or more a week to one or two. She could craft and play with her 4-year-old again.

What treatment did you receive?

Rest and pain medication alone do not restore a joint. If your care so far has only been passive, or has only treated the shoulder in isolation, the tissues may be healing short and stiff. The goal in the first weeks and months is to prevent fibrosis, the scar tissue that forms in the muscles, ligaments, tendons and joint capsule, so the shoulder heals with full motion. Stubborn shoulder pain often lives in the joint capsule and ligaments, which massage and generic exercise cannot reach. Exercises copied from a video can even aggravate a shoulder whose joint is still restricted.

Has the shoulder been tested under load?

Early on it can be hard to tell how injured a shoulder is, because everything hurts and headaches or neck pain take center stage. As other things improve, we can move more and test more, and sometimes “hidden” problems appear. That is why I re-examine patients regularly and measure strength, grip and range of motion, not just pain.

When Should I Get an MRI If My Shoulder Is Still Hurting After a Motor Vehicle Accident?

Most post-crash shoulder injuries are sprains and strains that respond well to conservative care, and an MRI is not needed on day one. In my practice, these are the signs that tell me an MRI is the right next step:

• Weakness that persists. Rotator cuff strength of 3/5, or a clear weakness on one side that is not improving after several weeks of care.
• A large grip strength difference between the two hands. A big grip loss is another sign of a possible tear in the shoulder.
• The arm will not raise like it did before, or raising it stays painful and limited once other symptoms have settled enough to test it properly.
• Labral signs. A positive clunk or crank test suggests a tear of the labrum, the cartilage rim of the socket.
• Progress has stalled. If the shoulder (or neck) stops improving despite good care, imaging tells us what is in the way.
• Signs coming from the neck. If pressure on the lower neck or nerve tension tests keep sending pain down the arm, a cervical MRI may be more useful than a shoulder MRI.

Which MRI? A standard (non-contrast) MRI shows tendon and muscle tears, which are more superficial. An MRI with contrast, called an MR arthrogram, involves an injection into the shoulder and lets us see deeper into the joint, showing labral and ligament tears. They also have different costs, so the exam findings decide which one is ordered.

What the result changes. The MRI tells us to what degree a tendon is torn. In general, a partial tear of less than about half the tendon usually heals without surgery, and we still involve an orthopedic surgeon to monitor it. A larger tear may not heal well on its own and may need to be repaired. Our goal is to avoid surgery, but we want to catch and document the injury.

When an MRI is not the answer. If your range of motion is full and the provocative tests are negative, an MRI often shows incidental findings that do not match the pain and would not change treatment. In those cases we keep treating, or refer to a pain specialist, rather than chasing images. We usually start with X-rays of the neck, including flexion and extension views, which are not taken to find fractures but to see whether stretched ligaments let the vertebrae shift too much.

Case example: when an MRI was clearly needed. A grandmother was rear-ended while stopped at a red light. Over the next month her right shoulder became her main complaint, even more than her neck. She could not comb or wash her hair, get dressed easily, lift 10 pounds or raise her arm overhead, and the pain woke her at night. Her rotator cuff stayed at 3/5 and both the clunk and crank tests were positive. I recommended an MRI arthrogram sooner rather than later to look for a cuff and labral tear, plus a shoulder brace to keep the arm from hanging and pulling on the irritated tissues so she could sleep better.

Case example: an MRI that gave reassurance. A 23-year-old woman’s neck and shoulder improvement stalled, so we ordered a neck MRI and later a right shoulder MRI. The shoulder MRI showed mild tendinosis and bursitis but no rotator cuff or labral tear. That told us conservative care was the right path, and she went on to reach about 90% improvement (see below).

How to Get Your Shoulder Better, and Stay Better, After a Car Accident

Preventing chronic pain and reaching full recovery means treating the whole neck, rib and shoulder complex, then rebuilding the shoulder’s capacity to handle real life. Here is how we do it.

1. Releasing nerve irritation

The nerves that supply the shoulder and arm start in the neck, so shoulder, neck and arm pain are often connected.

• Nerve flossing and glides. Nerves need to glide freely inside their sheaths. Gentle flossing of the neck and arm, with slight arm movement, creates more space for the nerves and blood flow, reduces entrapment and calms referred pain and arm numbness. I often give it as a home exercise.
• Cervical traction and decompression. Mechanical decompression offloads the neck and reduces pressure on the spinal nerves. We start light, around 20 pounds, and progress toward 35 pounds as the body tolerates it, because starting too high can cause muscle spasm. When traction relieves the neck, head or arm pain, that also tells us the symptoms are mechanical and coming from the neck.

2. Restoring shoulder blade and joint mechanics

Treating the shoulder in isolation rarely works, because these injuries usually involve the neck, shoulder and ribs together.

• Adjustments along the whole chain. Adjusting the neck, the cervicothoracic junction (C7 to T1), the upper back and ribs restores normal shoulder blade motion. Clavicle work matters too: the collarbone helps the shoulder rotate and not impinge, and adding rotation to it lets the shoulder turn more with less stress on the neck and back.
• Shoulder adjustments and mobilization. I adjust the shoulders of practically every patient, because it opens up the shoulder, and modern life puts the shoulder forward. On a drop table, the shoulder is placed into specific positions and a section of the table drops away to add a quick, gentle acceleration into the joint. Distraction gives a deep stretch of the joint capsule, which is the ligaments, often with a painless click and a sense of relief that comes on almost immediately. We also use targeted mobilization to restore internal and external rotation. Around a suspected tear we use light mobilization only, so we do not aggravate the injured cuff. Some patients feel sore for a day or two afterward, which is normal.
• Blood flow and brain awareness. Separating restricted joints and mobilizing the tissues increases local blood flow, which helps clear inflammation. Stimulating the joint receptors also increases the brain’s awareness of the injured area. This matters because research by Sandlund et al. (2006) showed that people with chronic whiplash have measurably impaired shoulder position sense, and that this deficit tracks with their level of disability.

3. Soft tissue remodeling and trigger points

Hands-on therapy to the front of the shoulder, the deltoid and the biceps tendon, plus trigger point work in the neck and shoulder muscles, reduces protective muscle splinting and spasm, breaks up adhesions and restores soft tissue flexibility. The tissues want to heal, but they get stuck in the inflammatory response. Deep but brief pressure on the ligaments and tendon attachments brings blood flow to them. It can feel sore, and scar tissue work can temporarily inflame, so I adjust the depth when a shoulder flares. I’ve treated people with known partial tears this way and seen really good improvements in function.

4. Progressive loading and movement re-education

This is the step that keeps you better.

• Rotator cuff and shoulder blade strengthening. We use resistance bands and light weights: external and internal rotation, “goalpost” and “boxer” movements, supraspinatus raises in the scapular plane (“ski pole”), shoulder shrugs, dynamic biceps work, push-up plus and half planks. Weakness of the shoulder blade is the weak link of the whole chain: neck, mid-back and shoulder. Rehab training is different from a workout routine: we want to feel tension, not pain.
• Home shoulder traction. A band over a door, lightly pulling the shoulder into traction, is an easy way to keep the joint moving between visits.
• Movement strategy. We teach you to engage your core before reaching or lifting, and to take pacing breaks, so the shoulder is protected while it heals. Recovery moves from fixing what broke to rebuilding capacity.
• Gradual is the key. Overuse injury is real. As you go back to hiking, the gym or heavy work, we support the body with treatment while the load increases. Stopping care too early, right before you scale up the weights, is a common reason shoulders flare again.
• Test the shoulder at full capacity. If you haven’t tested your shoulder at full capacity, you don’t really know where you are. Sometimes a little apprehension is enough to keep us from healthy activity, and that itself becomes a limitation. Exercise is going to be paramount to full recovery.

When I rate recovery with my patients, 100% means “as if the accident never happened.” It includes the ability to do daily tasks and strenuous activities, not just the absence of pain.

Patient Results From Our Office

Patient details have been changed or left out to protect privacy.

Reached back to protect her son. A mother was rear-ended at a light while twisted, reaching back with her right arm to brace her son. Her shoulder and arm hurt first, then her neck. At her first visit she could only raise the arm to 80 degrees, rotation was severely limited and she woke 4 to 5 times a night. We treated her neck, ribs and shoulder with adjustments, nerve flossing, deep tissue work, massage and band exercises at home and at work. Her shoulder abduction improved from 89 to 126 to 151 degrees, her right grip strength went from 21 pounds to 61 and eventually to 76 pounds, stronger than her other hand, and night waking dropped to once or twice. Her headaches went from daily to once or twice a week. By her final exam she was 85% improved and her neck had recovered completely. Because some weakness and a “slight pinch” remained with throwing and heavy lifting, we recommended an MR arthrogram and an orthopedic consult to make sure nothing deeper was left behind.

23-year-old with a rotator cuff injury. After a January crash she had neck pain, right shoulder pain, headaches and concussion symptoms. Her MRI showed tendinosis and bursitis without a tear. With adjustments of the neck and both shoulders, shoulder traction, decompression, massage and progressive band and dumbbell exercises, she improved from 70% to 90%. She lifted an 88-pound box with only a brief ache, vacuuming no longer bothered her, and her pain flares dropped from 8/10 to 5–6/10, only occasionally.

Young man, T-boned, delayed shoulder pain. His low back hurt first and his right shoulder pain came on over the following days, until his neck, upper back and shoulder were constantly 7 to 10 out of 10. After about five weeks of care he was 80% better: his pain became occasional soreness behind the shoulder blade, he could walk 60 to 90 minutes pain-free and he was sleeping through the night.

Grandmother, rear-ended on a freeway ramp. Four days after the crash her neck, upper back and left shoulder began to ache, with pain spreading into the arm. Pressure on the side of her neck reproduced the shoulder pain. Using decompression, nerve flossing, gentle mobilization of the neck and shoulder, and a gradual return to weights, her deltoid strength went from 4/5 to 5/5, her shoulder range of motion returned to normal, and within a month she completed a 3-mile hike and a 50-minute gym session.

Woman hit while stopped at a light. Pressing on the side of her neck sent pain into her left shoulder and upper chest. With adjustments of the neck and both shoulders, cervical decompression, massage and a kettlebell squat and lunge progression, her rotator cuff strength went from 3/5 to 5/5, her headaches resolved, and her neck rotation improved from 45 to 66 degrees.

When conservative care is not enough. A man in his 50s had a rotator cuff repair a few months before he was rear-ended by a pickup while stopped. He braced on the wheel and his right shoulder twisted forward. His MRI showed a large full-thickness tear. We improved his range of motion (abduction from 88 to 124 degrees) and grip strength (from about 60 to over 90 pounds), but a tear like this needs a surgeon, and we referred him for an orthopedic evaluation. Knowing when to refer is part of good care.

Conclusion

Shoulder pain after a car accident is common, often delayed, and often coming from more than one place: the shoulder joint, the neck, the ribs and the nerves in between. If your shoulder started hurting days or weeks after a crash, or it isn’t improving with the care you’ve had, it deserves a thorough evaluation that looks at the whole system and finds the injured structure. The goal is not only to calm the pain, but to restore motion, prevent scar tissue, rebuild strength and get you back to doing hard things without hurting.

If you were in a car accident and your shoulder is still bothering you, call Dr. Verg Chiropractic in Vancouver, WA or Clackamas, OR to schedule an evaluation.

Sources

[1] Who is Dr. Arthur Croft, and why does his opinion matter? Dr. Arthur C. Croft, DC, MPH, is the director of the Spine Research Institute of San Diego and one of the most widely published researchers on whiplash and low-speed car crash injuries. He has spent decades studying how collisions injure the neck, shoulder and spine, and his work is used by doctors, attorneys and courts to understand these injuries. When we cite his findings, we are relying on one of the leading authorities in crash injury research. (profile, WebMD bio)