What is Leg Length Discrepancy? Check the points you can't judge by appearance alone!
Hello!
I am Takahashi, the lead trainer at Small Gym Pain-Free.
While "leg length discrepancy" refers to the appearance of one leg being longer than the other, the truth is that not all cases are caused by the same thing.
Broadly speaking, there are two types: "functional leg length discrepancy" and "structural leg length discrepancy," and each requires a different approach. First, it is important to understand this difference.
Functional leg length discrepancy: Caused by posture and balance issues
Functional leg length discrepancy is a condition where, despite the bones themselves being the same length, the legs appear to be different lengths due to disturbances in posture or muscle balance.
Major causes include scoliosis, pelvic tilt, and abnormal positioning of the hip or knee joints.
・Trochanter-malleolus length → Influenced by the knee joint
・Spine-malleolus length → Influenced by the hip joint
・Umbilicus-malleolus length → Influenced by pelvic tilt
Each is affected by different parts of the body.
In other words, how the legs appear depends on where the problem lies.
This type of leg length discrepancy can potentially be corrected through training, stretching, and posture improvement.
In many cases, balancing the muscles and creating proper alignment can improve the visual asymmetry.
Structural leg length discrepancy: Differences in the bones themselves
On the other hand, structural leg length discrepancy is a condition where there is an actual difference in the length of the bones.
This is caused by congenital skeletal differences, fractures, or surgeries.
In this case, no matter how much you train, the length of the bones will not change, so it is difficult to improve through exercise.
As for how to handle it, you may need to consider balancing it with insoles or lifts, or seek medical advice.
Assessment is key: The wrong approach can be counterproductive
The most important thing regarding leg length discrepancy is to determine "which type you have."
If it is a functional problem, improvement can be expected through exercise, but if you try to force an approach on a structural problem, you may end up increasing the burden on your lower back and knees.
Conversely, it is a great shame to leave a functional leg length discrepancy that could have been improved untreated.
What kind of discomfort does leg length discrepancy cause?
Leg length discrepancy is not just a visual issue; it affects the entire body.
For example, a fixed pelvic tilt can lead to lower back pain, and an uneven burden on the knee joints can lead to knee pain.
Also, in the long term, it can reinforce poor posture and movement habits, so early intervention is important.
Summary
There are two types of leg length discrepancy: "functional" and "structural," and both the causes and the approaches differ.
Functional leg length discrepancy can potentially be changed through training and posture improvement, but structural leg length discrepancy cannot be changed through exercise.
The important thing is to evaluate correctly and choose an approach that suits your condition.
Not ignoring your leg length discrepancy and dealing with it appropriately will lead to the prevention of lower back and knee pain, and help you build better posture (^^)
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