The hip joint is built for stability during weight bearing activities such as walking, running, getting out of a chair, ascending and descending stairs and squatting to the floor to pick something up. The bony geometry of the hip reveals a deep socket (acetabulum) surrounding the ball (head) of the thigh bone (femur). The acetabulum and the femoral head are covered with cartilage. The angle of the shaft of the femur relative to the head, the amount of rotation in the shaft of the femur (torsion) and the depth of the acetabulum has an impact on the biomechanics of the joint and, if abnormal, the need for hip arthroscopy. Measurement of these angles by the physical therapist and the orthopedic surgeon in addition to performing special testing to stress structures of the hip helps in developing a clinical picture in the presence of hip pain.
A cartilaginous structure surrounding the acetabulum, the acetabular labrum, can become torn due to degenerative processes or through trauma.
Surrounding and encasing the joint is the capsule which includes strong ligaments (capsuloligamentous complex). This structure gives additional stability to the joint during movement. These stabilizing structures include the iliofemoral, ischiofemoral and pubofemoral ligaments. Together with the ball and socket bony structure, the strength of these ligaments makes it hard to dislocate a normal hip – thank our lucky stars!
Muscles, attached from the pelvis to the femur, create movement and stability during weight bearing on the limb. The primary movers of the hip joint are the gluteus maximus, gluteus medius, gluteus minimus, iliopsoas and the various adductor muscles. In addition, there are the quadriceps (front of the thigh), particularly the rectus femoris, and the hamstrings (back of the thigh) to consider as well as the hip rotators, situated deep to the gluteus musculature.
To the left you seethe outer hip muscles. Peel them away and you reach the deeper muscles, as seen in the image immediately above. So, based on the complex muscular anatomy, and how important these muscles are in normal walking, as well as all other weight bearing function, be skeptical of healthcare providers who feel no physical therapy is needed after some kind of surgery. You must retrain the muscles to work correctly.
Consider this. Each time we transfer weight onto one of our legs, the hip abductors (gluteus medius) must contract to stabilize the pelvis (not permit it to sag on the non-weight bearing side). The importance of this from a rehabilitation standpoint is that the physical therapist will focus a great deal of attention on maximizing the functional strength of this muscle, it being so vital in recovery of a normal gait pattern.
(Picture from the Oregon Exercise Therapy Blog)
Hip arthroscopy is commonly used to address acetabular labral tears and femoroacetabular impingement as well as capsular repair. It may also be used to remove any chondral flaps due to arthritis within the joint. During an arthroscopy the surgeon may also perform a soft tissue release to alleviate muscle pain due to tendons or parts of a muscle rubbing on a bony prominence.
In a future post, I hope to convince one of the orthopedic surgeons, who specializes in hip arthroscopy, to detail his thoughts on the indications for hip arthroscopy. Maybe he can also give some insight into why he feels physical therapy is beneficial following such a surgery.
Your Call to Action
If you walk with a limp without pain and feel off balance or are concerned your leg will give way on you, it may be that you need very specific strengthening exercises to correct your gait and prevent falling. After all, if you prevent falls, by strengthening supplemented by specific fall prevention training, you avoiding impact in hitting the ground, i.e. falls, and thus you avoid more severe injuries such as fractures.
Call a physical therapist and get in for an evaluation and a suitable exercise/balance program. You will be glad you did!