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(602) 345-1818A shoulder knee injury car accident claim gets treated as a minor claim far more often than it should. You walked away from the crash. Nothing was broken. Then three weeks later you cannot lift a grocery bag over your head, or your knee gives out on the stairs, and an adjuster is asking why you waited so long to see an orthopedist.
This article covers how these injuries happen in a collision, how doctors diagnose them, how functional limits get documented for a claim, and one argument insurers frequently raise in these cases: that your joint was already worn out before the crash. It also covers the Arizona filing deadlines, including the much shorter ones that apply when a government vehicle or a government-owned road is involved.
Shoulder and knee injuries usually come from two separate mechanisms in the same collision.
The first is bracing. In the fraction of a second before impact, many drivers who see it coming lock their arms against the steering wheel and press hard into the brake pedal. That turns your arms and legs into rigid struts. When the crash energy arrives, it travels straight up the limb into the joint. The shoulder absorbs a sudden compressive and rotational load. The knee absorbs an axial load through an extended leg.
The second is occupant motion. Your body keeps moving after the vehicle stops. The seat belt holds your torso, but your shoulder rotates hard against the belt path. Your knees travel forward into the dashboard or the lower instrument panel. Side impacts drive the shoulder into the door and B-pillar. Any of these can hyperextend or rotate a joint well past its normal range.
This is not theoretical. Federal crash investigators reconstruct exactly this kind of occupant kinematics. The National Highway Traffic Safety Administration’s Special Crash Investigations program builds its case files from scene evidence, vehicle inspection, occupant interviews, medical records, and event data recorder downloads (NHTSA, Special Crash Investigations). That combination of vehicle damage, occupant position, and medical findings is the same evidence set that makes a joint-injury claim credible or shaky.
Which is why the details you might dismiss matter. Were you braced? Which hand was on the wheel? Did your knee hit something, and is there a scuff or deformation on the lower dash? Write it down while you remember it.
On the shoulder side, the diagnoses that show up after a collision include rotator cuff tears (partial or full thickness), labral tears such as SLAP lesions, AC joint separations, and anterior dislocations or subluxations. Fractures of the clavicle, scapula, or proximal humerus occur in higher-energy crashes.
On the knee side, the recurring findings are meniscus tears, ACL and PCL tears, MCL and LCL sprains, patellar fractures, and patellar dislocations. Dashboard contact with a flexed knee is a recognized mechanism for a PCL injury and for patellar fracture.
These injuries frequently ride along with other trauma from the same crash. Neck strain, back complaints, and head impact are common companions, and symptoms in one area can mask symptoms in another for days. If your head struck anything, or you felt dazed or foggy afterward, that deserves its own evaluation. The Centers for Disease Control and Prevention notes that concussion symptoms can appear or worsen in the hours and days after the injury (CDC, About mild TBI and concussion). Spine involvement is its own category, and the National Library of Medicine’s patient overview describes how spinal cord injury is evaluated and treated (MedlinePlus, Spinal cord injuries). If you are dealing with several injury sites at once, read our overview of delayed symptoms after a car accident, because joint pain can surface days after the collision rather than at the scene.
Imaging choice depends on the tissue in question, and the distinction matters for your claim.
X-ray shows bone. It rules in or rules out fracture and dislocation. It is usually the first study done in the emergency department. What it does not show is a torn rotator cuff or a torn meniscus.
MRI is the study for soft tissue. Rotator cuff and labral tears, meniscus tears, and cruciate and collateral ligament injuries show up on MRI. This is a common reason people with real joint injuries end up with an undervalued claim: the ER gets a clean X-ray, tells them nothing is broken, and they never get the MRI that would have identified the actual injury.
CT is used for complex or comminuted joint fractures where the surgeon needs detailed bone architecture before planning repair.
Alongside imaging, the orthopedic physical exam carries real weight. Range-of-motion measurements in degrees, strength grading, and provocative tests (Lachman and McMurray for the knee, Neer and Hawkins and apprehension testing for the shoulder) produce objective findings an adjuster cannot simply wave off as subjective complaints.
Your treating physician decides what imaging and testing are appropriate for your situation. Nothing here is medical advice.
Here is what most people do not realize. The diagnosis is only half of what determines claim value. The other half is functional limitation: what you can no longer do.
The documentation that carries weight is specific and measured:
Tell your doctor about the practical failures, not just the pain level. “Shoulder hurts, 6 out of 10” is worth far less in the record than “cannot reach the top shelf or fasten a seat belt with the right arm.” One is a number. The other is evidence of how the injury changed your life.
Consistency matters just as much. Gaps in care give the other side an argument that you recovered and then hurt yourself doing something else. We cover that problem in detail in gaps in medical treatment and your accident claim.
This is a recurring fight in shoulder and knee cases, and it is the piece most injury pages skip.
Joints wear out with age. Rotator cuff fraying and degenerative meniscus changes are common findings in people who have never been in a collision, and they often exist without symptoms. When the MRI report says “degenerative changes” anywhere in it, expect the adjuster to highlight that sentence and argue your injury predates the crash.
That argument is not automatically wrong. It is also not automatically right. What separates the two is usually:
Arizona law does not require you to have been in perfect health before the crash. Aggravation of a pre-existing condition can be compensable, though how that plays out depends on the medical records and the specific facts. Proving it takes clean documentation and, often, an orthopedic opinion. Our page on pre-existing conditions in an Arizona car accident claim walks through how that analysis works.
One practical warning: this issue is part of why adjusters push early for broad medical authorizations and recorded statements. You generally are not required to give a recorded statement to the other driver’s insurer. Your obligations to your own insurer depend on the cooperation provisions in your policy, and policy language varies, so it is worth having reviewed before you talk. See insurance adjuster tactics in Arizona.
Most shoulder and knee injuries start conservative. Rest, ice, anti-inflammatories, bracing or a sling, and a structured physical therapy course. Many patients improve on that path alone. Some receive corticosteroid or other injections.
When conservative care does not resolve the problem, or when the tear is large or the joint is unstable, the orthopedist may recommend arthroscopic repair, ligament reconstruction, or open fixation of a fracture. Recovery after a rotator cuff repair or ACL reconstruction often involves months of rehabilitation and graduated return to activity.
The order of events matters for a claim. A documented pathway often looks like this: emergency or urgent care evaluation, primary care follow-up, orthopedic referral, imaging, conservative trial, then surgery if needed. When that sequence is intact in the records, causation and reasonableness of treatment are easier to establish. If you are unsure whether to be seen at all after a crash, start with when to go to the hospital after a car accident.
Arizona damages fall into two categories.
Economic damages are quantifiable financial losses. Emergency care, imaging, orthopedic visits, physical therapy, surgery, medications, mileage, lost wages, diminished earning capacity, property damage, and projected future medical costs.
Future costs are common in joint cases, because a repaired shoulder or knee can require additional procedures, further therapy, or later hardware removal. Proving those costs generally requires expert medical testimony projecting what treatment will actually be needed and what it will cost. See future medical expenses in an Arizona accident claim.
Non-economic damages cover subjective losses: pain and suffering, emotional distress, and loss of enjoyment of life. For a shoulder or knee injury, that last category often carries significant weight. A person who can no longer golf, lift a child, kneel on a job site, or sleep through the night has lost something real. Our page on non-economic damages explains how those losses get presented.
We do not publish typical settlement ranges, because the honest answer is that value depends on severity, treatment history, liability proof, available insurance limits, and documentation quality. Anyone quoting you a number before seeing the records is guessing.
Arizona applies comparative fault. Under A.R.S. § 12-2505, the full damages otherwise recoverable are reduced in proportion to the claimant’s relative degree of fault, and the statute makes the defense of contributory negligence or assumption of risk a question of fact for the jury.
There is an express exception in the same section. The statute provides that there is no right to comparative negligence in favor of a claimant who has intentionally, wilfully, or wantonly caused or contributed to the injury or wrongful death. In that situation, recovery can be barred rather than merely reduced. So the general rule is reduction, not automatic loss of the claim, but it is not unlimited, and how the statute applies depends on the facts.
Practically, this means the other side has an incentive to assign you some share of blame, even in a clear rear-end collision. That is one reason early evidence matters. Our page on how fault is proven in Phoenix cases covers the evidence that settles those arguments.
In Arizona, a personal injury lawsuit against a private party generally must be filed within two years after the claim accrues, under A.R.S. § 12-542. That section is expressly subject to A.R.S. § 12-551, which governs product liability actions. Discovery issues, tolling, and the identity of the parties can also change the analysis.
Claims involving a public entity or a public employee run on a different, much shorter track, and there are two separate deadlines, not one.
Exceptions and wrinkles do exist. A.R.S. § 12-821.01 sets out when a cause of action accrues for these purposes, which is generally when the claimant realizes the damage and knows or reasonably should know its cause, so the clock does not always start on the crash date. Arizona also recognizes tolling for minors and for persons under a legal disability. Those exceptions are fact-specific and should be confirmed with counsel rather than assumed.
Why this matters in a joint-injury case: a crash with a city bus, a school district vehicle, a police cruiser, or a claim involving a government-maintained roadway falls into the public-entity track. Meanwhile, you may still be in physical therapy at month four, with no MRI yet and no clear picture of how serious the injury is. The deadline does not wait for your diagnosis to mature.
Two years feels long while you are still in treatment. One year and 180 days do not. Waiting until late in the period to look for counsel means evidence has gone stale and witnesses have moved.
Often, yes. Degenerative findings are common and frequently pre-date a crash without causing symptoms. What matters is whether the collision caused a new injury or made an existing condition symptomatic or worse. Symptom timing, prior treatment records, and orthopedic review of the imaging are how that gets sorted out.
Emergency X-rays are looking for fractures and dislocations. They do not show meniscus tears, ligament tears, or cartilage damage. A normal ER X-ray rules out a broken bone. It does not rule out a significant soft tissue injury.
No. Surgery is one factor among several. Conservative care with well-documented functional limits, persistent symptoms, and work restrictions supports a claim on its own. Record quality often matters more than the procedure code.
Against a private driver, generally two years from accrual under A.R.S. § 12-542. If a public entity or public employee is involved, a notice of claim is generally required within 180 days under A.R.S. § 12-821.01, and the lawsuit itself must generally be filed within one year under A.R.S. § 12-821. Accrual, discovery, and tolling rules can shift those dates, so confirm the deadline with an attorney early.
Under A.R.S. § 12-2505, Arizona generally reduces damages in proportion to the claimant’s relative degree of fault, and fault is a question for the jury. The same statute withholds that benefit from a claimant who intentionally, wilfully, or wantonly caused or contributed to the injury, so the outcome depends on the facts.
Generally you are not obligated to give a recorded statement to the other driver’s insurer. Obligations to your own insurer depend on the cooperation terms in your policy, and those terms vary. Have the request reviewed before you respond.
Shoulder and knee cases turn on medical documentation and causation, and both are easiest to protect early. Our team handles Arizona car accident claims and works to make sure functional limits, imaging findings, and future treatment needs are actually in the record before anyone starts negotiating.
Jared J. Pehrson practices personal injury law in Phoenix and handles car accident matters personally rather than routing them through an intake queue. This article is general information about Arizona law and medical documentation, not legal or medical advice.
Free case review with Jared J. Pehrson: (602) 345-1818. We answer 24/7. Fee terms and case costs are set out in a written agreement.
Sources: NHTSA Special Crash Investigations; CDC, About mild TBI and concussion; MedlinePlus (National Library of Medicine), Spinal cord injuries. Arizona statutes cited: A.R.S. § 12-542, § 12-551, § 12-2505, § 12-821, § 12-821.01.
By Jared J. Pehrson | Impact Legal Car Accident Attorneys
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