American Hip Institute

Glossary of Hip Terms

Acetabuloplasty:  Surgical Procedure involving trimming of the acetabular rim to eliminate acetabular over-coverage, or a pincer lesion.

Acetabulum: Boney socket of the hip joint.

Arthroscopy:  Minimally-invasive surgical procedure which uses a camera to view the joint and small instruments to operate within the joint through tiny “poke-hole” incisions.

Cam Lesion: Refers to a non-spherical shape of the femoral head, causing femoroacetabular impingement of hip joint. This may be congenital, developmental or acquired.

Direct Anterior Hip Replacement: Minimally-invasive, anterior approach hip replacement. This surgical procedure is done through a mini-incision on the front of the hip. It may allow quicker recovery and increased accuracy in component position of the hip prosthesis.

Dysplasia:  Refers to a shallow acetabulum or hip socket. This is a congenital deformity. The hip socket is susceptible to increased instability. It may result in hip injuries including labral tears, damage to other soft tissues and the early onset of osteoarthritis.

Femoral Head:  The “ball” of the ball-and-socket hip joint. This is the top of the femur or long leg bone.

Femoroacetabular Impingement:  (FAI) or hip impingement. Repetitive pinching between the femoral neck and the acetabulum during certain motions. This can cause damage to the labrum, boney surfaces and soft tissues of the hip joint.

Femoroplasty: Surgical Procedure involving recshaping of the femoral head to eliminate apsherical deformity of the femoral head, or a cam lesion.

Femoroplasty:  Surgical Procedure involving reshaping of the femoral head to eliminate aspherical deformity of the femoral head, or a cam lesion.

Hip Impingement: Known as Femoro-Acetabular Impingement (FAI). Repetitive pinching between the femoral neck and the acetabulum during certain motions. This can cause damage to the labrum, boney surfaces and soft tissues of the hip joint.

Hip Resurfacing: A bone-conserving alternative to hip replacement, Both the femoral head and acetabulum are “resurfaced” with metal shells to replace the arthritic surface.

Labral Tear: A tear of the labrum or cartilage ring surrounding the hip socket.

Labrum: A ring of rubbery fibrocartilage surrounding the rim of the acetabulum, which acts to create a suction seal of the hip joint.

Minimally-Invasive Surgery: Refers to both small incisions and the avoidance of any disruption of the soft tissues, such as muscles and tendons. Procedures of this type typically involve decreased postoperative pain and may allow for a quicker recovery.

MR Arthrogram:  A special type of MRI which allows for dye to be injected into the joint under X-ray or fluoroscopic guidance to confirm placement. This dye allows for damage to soft tissues within the hip joint to be viewed more accurately, such as the labrum.

Pincer Lesion:  Refers to acetabular over coverage of the hip joint, causing femoroacetabular impingement of hip joint. This may be congenital, developmental or acquired.

MAKOplasty Robotic Hip Replacement: Surgical procedure performed with guidance of the MAKO Surgical Robot, a specialty surgical robot that works with the surgeon to allow increased surgical precision in component positioning in hip replacement.