How Does the Tennis Serve Load Your Spine?
In a tennis serve, your trunk arches back, bends to the side and rotates, all very fast. This puts large forces through the lower spine. Repeated over thousands of serves, this pattern of load can stress the small bony bridges at the back of each vertebra. This can contribute to lower back pain and, in some cases, a stress reaction or fracture called spondylolysis.
Key points
- The serve puts more load on the spine than any other tennis stroke.
- Repeated extension and rotation stress the pars interarticularis, a vulnerable part of the vertebra.
- Tennis is a one-sided sport, so it creates imbalance in muscle strength and spinal alignment.
- Scans done lying down can miss alignment problems that only appear when you are standing and bearing weight.
- A standing whole-body scan shows spinal alignment, pelvic symmetry and compensations in one image.
What happens to your spine during a tennis serve?
Your spine goes through three fast phases in less than a second. First, you arch backwards (trunk extension) to store energy. Then you bend sideways and rotate your trunk to drive the racket upwards. Finally, you snap forward (flexion) as you hit the ball. This mix of extension, side bend and rotation loads the lower lumbar vertebrae from several directions at once.
The kick serve is especially demanding. Because you need heavy topspin, you arch further back and rotate more aggressively than with a flat serve. Research shows this combination produces the highest spinal loads of any tennis stroke.
A club player might serve 50 to 100 times in one match. A competitive player could serve hundreds of times in a training week. That volume matters. It is repeated stress that builds up over time, not a single incident, that usually causes problems.
What does tennis back pain feel like?
Back pain from tennis is usually in the lower spine, often on one side. It tends to come on slowly and get worse with serving or overhead shots, rather than starting suddenly after one point.
A dull ache on your playing side that builds during or after play.
Arching movements, like the trophy position of the serve, bring the pain back.
The lower back feels locked up the day after a match or hard session.
You hold back on the serve because arching fully is uncomfortable.
Important. If you develop numbness or weakness in a leg, or any loss of bladder or bowel control, get urgent medical help. Contact your doctor or go to the nearest emergency department.
Why does tennis cause lower back pain?
Tennis loads the spine unevenly because it is a one-sided sport. You serve, hit forehands and reach overhead with the same arm. This builds different muscle bulk and flexibility on each side. Over time, this imbalance can shift your alignment.
Repeated extension and rotation focus force on the pars interarticularis, a thin bony bridge at the back of the vertebra.
Stronger muscles on your playing side can pull the pelvis or spine into a slight twist, creating a rotated pelvis.
More serves each week means more load that builds up. The spine may not recover fully between sessions.
Without strong deep core muscles, the spine takes forces the trunk should share.
When the pars is stressed more than it can repair, a small crack can form. This is called spondylolysis. It is one of the most common causes of persistent lower back pain in tennis players and other athletes who arch and rotate again and again.
How does a standing scan show what lying-down scans miss?
Most scans ask you to lie flat. When you do, gravity is taken away, your muscles relax, and alignment shifts that only appear when you are upright may disappear. For a tennis player with an uneven spine or a slight pelvic rotation, a lying-down image can look normal even though you are in pain on court.
Weight-bearing, full-body view. An EOS scan captures your whole skeleton from head to feet while you stand naturally. It shows pelvic tilt, spinal curves, differences in leg length and rotational imbalances, all under real-life load. Because tennis creates imbalance, this full-body picture is especially useful.
ScanAlign standing EOS imaging uses about 90% less radiation than a standard X-ray, around ten times less. The scan takes seconds, and you stay clothed.
No gravity, no load. MRI and CT are done lying down. They are excellent for detail of soft tissue, discs and nerves. But they remove the weight-bearing forces that show alignment problems. A spine that looks straight on the table may show a measurable curve or rotation when you stand up.
When MRI is the better tool. EOS shows bones, joints and alignment under load. For soft tissue, discs or nerves, MRI is usually the right choice. The two work together, they do not compete. Your treating specialist can advise which you need.
What can you do about tennis back pain?
Understanding the cause is the first step. Many tennis players spend months treating the sore area without knowing whether the problem is alignment, a bony stress reaction or muscle imbalance. An accurate diagnosis guides the right plan.
So before you start treatment, or change the one you are on, it is worth getting a detailed diagnosis. Knowing whether the cause sits in the pelvis, the legs or the spine changes what will actually help.
- Have persistent lower back pain linked to serving or overhead shots
- Feel your body is uneven or one hip sits higher
- Have had lying-down scans that looked normal but still have symptoms
- Want a full-body picture before seeing a physiotherapist or surgeon
- Have a fresh, acute injury from a fall or collision on court
- Suspect a disc problem with nerve symptoms (MRI is usually better)
- Need emergency imaging for sudden severe pain or neurological signs
Not sure whether a standing scan is right for you? You can book a standing spine scan or start with a free video consultation to talk through your symptoms first.
Book a free video consultationFrequently asked questions
The serve forces your spine into fast extension, side bend and rotation. These movements focus force on the lower lumbar vertebrae. Over many repeats, this can irritate joints, stress bony structures or overload muscles on your playing side.
Yes. Repeated extension and rotation can stress the pars interarticularis, a small bony bridge at the back of a vertebra. If the bone cannot repair between sessions, a stress reaction or fracture called spondylolysis can develop.
Generally, yes. The kick serve needs more trunk extension and more aggressive rotation to create topspin. This combination increases the load on the lower spine compared with a flat or slice serve.
Hitting thousands of forehands and serves with one arm builds uneven muscle strength and flexibility. Over time, this imbalance can pull the pelvis into a slight rotation or shift the spine sideways. A standing full-body scan can show these imbalances clearly.
When you lie flat, gravity is taken away and your muscles relax. Alignment shifts, pelvic tilts and compensating curves that appear under load can disappear on the table. This can make the image look normal even when your symptoms are real.
An EOS scan is a standing X-ray that captures your whole skeleton from head to feet in one image. It uses about 90% less radiation than a standard X-ray, around ten times less, making it one of the lowest-dose imaging options available.
No. ScanAlign accepts self-referrals. You can book a free video consultation directly, without a letter from your doctor or specialist.
The price for patients travelling from abroad is confirmed during the free video consultation. You can also read the ScanAlign FAQs.
A scan gives diagnostic information, not treatment advice. The images and report help your treating specialist, physiotherapist or surgeon make informed decisions about your training and care. ScanAlign is a diagnostic imaging clinic and does not prescribe treatment.
You can stay in normal clothes as long as they have no metal zips, buttons or buckles. Sportswear or leggings with a plain t-shirt work well. The scan takes only seconds.
Find out what your spine looks like when you stand
A free video consultation takes a few minutes. We will talk about your symptoms and whether a standing scan is the right next step.
Book a free video consultationWritten by Abbas Dhami (Specialist Diagnostic Radiographer)
Sources
- Campbell A, et al. "Lumbar loading in the elite adolescent tennis serve." British Journal of Sports Medicine, 2013;47(15):e4.
- Alyas F, Turner M, Connell D. "MRI findings in the lumbar spines of asymptomatic, adolescent, elite tennis players." British Journal of Sports Medicine, 2007;41(11):836-841.
- National Institute for Health and Care Excellence (NICE). "Low back pain and sciatica in over 16s: assessment and management." NICE guideline NG59, updated 2020.
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.