The causes of hip internal rotation limitation are muscular tightness, especially in the external rotators and adductors, a tight posterior hip capsule and even structural bony changes like FAI or femoroacetabular impingement.
Other causes of hip internal rotation limitation are prolonged sitting, excessive pelvic forward tilt and poor rotational control, which also restrict this movement and motion and commonly results in lower back pain or knee pain.
The key causes of limited hip internal rotation are tight soft tissue, like shortened posterior hip muscles, "piriformis, obturator internus" and adductors, which restrict the ability of your femur to rotate internally.
Joint capsule stiffness, which is a tight posterior hip capsule, which physically prevent the femoral head from moving properly in it's socket.
Structural impingement, which are bony abnormalities, like excess bone on the femoral neck or acetabulum, physically block he rotation, which is a common issue in young and active people.
Prolonged sitting also keeps your hip in a flexed, externally rotated position, which also promotes tightness.
And standing in a swayback posture or over-active glutes can also compress the back of your pelvis and limit range.
And the pelvic position, a forward tilted pelvis or anterior tilt, compresses your hip joint, reducing the space for rotation.
And variations in your hip structure, most specifically anteverted or forward angled, or retroverted, also known as backward angled acetabulum also affect range.
The signs of a lack of hip internal rotation and hip internal rotation limitation are pelvic imbalances, altered gait, knee pain and low back pain.
These signs and symptoms of lack of hip internal rotation can occur as your body compensates for the lack of hip mobility, by placing stress on your other joints and muscles.
With a lack of hip internal rotation, you might also have difficulty with your everyday movements, such as getting out of a car or putting on your clothes, which all require the crucial range of motion.
Your lumbar spine may also try to compensate for the lack of hip rotation and cause muscle tension, pain and misalignments.
Your knees are also not designed to rotate, so when your hip rotation is limited, your knees can bear the brunt of the stress and increase your risk of injury.
And you might also notice that your feet or knees are turning inward or caving in during walking or other movements because your body is trying to find a new and less efficient way to move.
And tasks which involve any twisting of your thigh inward, like getting into a car or other vehicle or putting on your clothes can become challenging or uncomfortable.
And limited internal rotation on one side can also result in uneven positioning and contribute to back pain.
A lack of hip internal rotation can occur due to sedentary lifestyles, muscular imbalances etc.
The muscles that are responsible for hip internal rotation might be weak or not working properly and prolonged sitting can also overactivate hip flexors and underactivate other hip muscles, which result in restricted internal rotation.