Hip microinstability The hip joint is comprised of the acetabulum of the pelvis and it covers 170 degrees of the femoral head.
Hip microinstability The hip joint is comprised of the acetabulum of the pelvis and it covers 170 degrees of the femoral head. The femoral head has approximately 48 degrees of lateral cephalad tilt and 21 degrees of anterior tilt. The anterior portion of the hip is stabilized by the labrum, iliofemoral ligament, ischiofemoral ligament, and the pubofemoral ligament.
The labrum also aids in hip stability by deepening the acetabulum and creating negative pressure during joint distraction. Hip instability is defined as an increase in motion of the hip joint. The term hip microinstability remains debatable, as no clear diagnostic criteria has been established.
Hip instability is seen in patients who have undergone hip arthroscopy with overresectin of the capsule and also in patients with intra-articular pathology within their native hip (1,10). There is a relationship between hip microinstability and femoroacetabular impingement. The term hip microinstability is meant to define motion within the hip joint that goes beyond physiologic range of motion.
The motion at the hip joint includes both rotation and translation. Excess motion can lead to an increase in rotational and translational forces, which can cause pain and the feeling of hip unsteadiness (1,5). Hip microinstability is typically found in a younger population, with patients ranging between ages 16 to 50 years of age.
The condition is seen more commonly in women who have more generalized ligamentous laxity. On clinical examination, pain is considered a positive test during the anterior apprehension test. The test is performed with the patient supine and the contralateral leg flexed toward the chest and then the affected leg placed in hip extension and external rotation.
If you are experiencing symptoms that may be related to hip microinstability, it is important to see a sports medicine physician. Early evaluation and treatment typically lead to better outcomes. Do not ignore pain or symptoms that are limiting your activity.
*This article is for educational purposes only and does not substitute for professional medical advice. Always consult a qualified healthcare provider.*
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