Glossary of Terms

Bilateral — occurring on both sides (e.g., bilateral hip dysplasia means you have dysplasia on both the right and left sides)

Cam Impingement (a form of FAI) — too much bone on the head of the femur making it aspherical or not perfectly round

CPM — Constant Passive Motion machine, used for 5 days/8 hours a day in the hospital immediately following surgery (some doctors require their patients to use the CPM at home for weeks following surgery)

Deep Vein Thrombosis — blood clot that forms in the leg; a possible complication after surgery; typically treated with blood thinners

FAI — Femoroacetabular Impingement (too much friction in the hip joint); common in high level athletes, but also occurs in active individuals; may be Cam, Pincer, or Mixed Impingement

Femur — the thigh bone; the large leg bone that connects to the hip

Femoral head — the “ball” at the top of the femur

Hip Dysplasia — a condition where the hip socket does not cover the femoral head as much as it should (see also

Hip Chicks and Hip Women — on-line groups for adult women with hip dysplasia

HO — heterotopic ossification; when bone forms in place of soft tissue following a bone surgery; also called ectopic bone

Hypertrophic Labrum — increase in the size of the labrum

Labrum — rim of cartilage surrounding the hip socket; acts to stabilize the socket

Mixed Impingement (a form of FAI) — too much bone in both the femoral head and acetabulum

Non-union or slow union — failure of bones to heal together after osteotomy or failure of bones to heal together at a normal pace after osteotomy; risk of non-union is around 1% following a PAO

NSAID — nonsteroidal anti-inflammatory drugs; a type of pain meds; includes aspirin, ibuprofen and naproxen (Aleve)

OS — orthopedic surgeon

Osteoarthritis — degenerative arthritis due to age and wear and tear on a joint; PAO surgery is typically only performed on individuals who have little to no osteoarthritis in the hip (which is why it is important to have the surgery early instead of waiting)

Osteotomy — intentional breaking of bone for purpose of treatment

OT — occupational therapist, they teach you how to perform daily tasks, like dressing

PAO — periacetabular (around the acetabulum or hip socket) osteotomy (bone break); RPAO — right side; LPAO — left side

Pincer Impingement (a form of FAI) — too much bone on the acetabulum resulting in too much coverage of the ball or femoral head

PT — physical therapist; they teach you how to walk with a walker or crutches

Revision THR — replacement of a worn-out prothesis following a total hip replacement surgery

Retroverted Acetabulum — a condition where the opening of the hip socket faces too far backward

TED — Thrombo Embolic Deterrent (aka compression stockings), worn to help prevent blood clots (Deep Vein Thrombosis)

THR — total hip replacement; where a worn out hip joint is replaced with an artificial hip joint