I understand and share the pride that comes with the ability to squat deep while lifting some serious weight. However, many athletes are unable to squat deep with load due to hip or low back pain. Femoral-acetabular impingement is often the culprit here, where the neck of the femur is literally jamming into the acetabulum of the pelvis. Dan goes into much greater detail in one of his prior posts on FAI. These same biomechanics also cause butt winking where there is a reversal of the lumbar spine causing a loss of segmental control. This spinal shear under load is dangerous and never okay – a butt wink is an immediate fault and nobody gets a pass. Altering squat width is a strong start to fixing these train wrecks.
So how do we determine best squat width for depth and performance (and to help prevent hip pain and butt winking)? “Shoulder width” is often used however that differs for each individual. Many times we just start with a random width and that becomes the default. However, factors such as motor control of the entire system (particularly the over-extended spine), hip and ankle mobility, and individual structural differences in acetabulum and femur alignment all influence squat width and depth.
The sooner the femur runs into the pelvis, the less depth you’ll achieve and squat numbers will plateau. But you don’t need an x-ray to determine how you should squat. Rather, we need to find the best squat width that allows the most depth while maintaining movement integrity (such as a neutral spine). This position is going to yield the best performance and the fewest injuries.
I like this test below (originally from Dr. Stu McGill, spine biomechanist) as:
Things to consider with this test:
In so many cases, we can prevent butt winking and un-impinge the hip with appropriate movement patterns and motor control exercises rather than rushing to surgery. Improve motor control first and foremost regardless of structure.
So ultimately, what is the best squat width? The one that allows the best depth while preserving movement integrity (i.e. no butt wink and optimal squat form). Regardless of starting squat width or structural variation, this does NOT change the essential movement principles of the squat. Feet should be straight, knees tracking over the foot, shins vertical as possible for as long as possible, hips externally-rotated.
You MUST prioritize and control the lumbar spine and pelvis, above all else. In my opinion, the ability to control the spine and pelvis is a prime determinant in the performance ceiling of athletics and human function so don’t lower that ceiling with improper movement patterns. Squat depth and width do not matter if these principles are not upheld. (i.e. Don’t squat deeper if you can’t maintain optimal spinal position)
Acknowledge that we can’t change the structural or boney issues in our bodies. Focus on the many variables we can change including squat width, mobility and improving motor control.
By Dr. Seth Oberst
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How Not to Destroy Your Lower Back While Squatting: Avoiding The Dreaded Butt Tuck Position
How to Modify the Squat to Eliminate Painful Pinching Hips
Quick and Easy TFL (Tensor Fascia Latae) Assessment and Stretch
A Deep Investigation into the Safety and Performance of the Deep Squat: Part 5 – Hip Health, Should we Squat With the Toes Straight Ahead?
A Deep Investigation into the Safety and Performance of the Deep Squat: Part 4 – Hip Mobility and Squat Depth
Lost Keys to a Deep Squat – Correcting Hip Internal Rotation
Why Do My Hips Hurt When I Squat? Femoral Acetabular Impingement: Part 4
Why Do My Hips Hurt When I Squat? Femoral Acetabular Impingement: Part 3