Hip replacement, or arthroplasty, is a surgical procedure in which the diseased parts of the hip joint are removed and replaced with new, artificial parts. These artificial parts are called the prosthesis. The goals of hip replacement surgery are to improve mobility by relieving pain and improve function of the hip joint.
Who Should Have Hip Replacement Surgery?
The most common reason that people have hip replacement surgery is the wearing down of the hip joint that results from osteoarthritis. Other conditions, such as rheumatoid arthritis (a chronic inflammatory disease that causes joint pain, stiffness, and swelling), avascular necrosis (loss of bone caused by insufficient blood supply), injury, and bone tumors also may lead to breakdown of the hip joint and the need for hip replacement surgery.
Prior to surgery your physician may try one or more non-surgical treatment options.
Non-surgical treatment options:
- Walking aids, such as a cane
- Non-steroidal, anti-inflammatory medications
- Corticosteroid medications
- Physical therapy
These therapies are not always effective in relieving pain and improving the function of the hip joint. Hip replacement may be an option if persistent pain and disability interfere with daily activities. Before a doctor recommends hip replacement, joint damage should be detectable on x-rays.
In the past, hip replacement surgery was an option primarily for people over 60 years of age. Typically, older people are less active and put less strain on the artificial hip than do younger, more active people. In recent years, however, doctors have found that hip replacement surgery can be very successful in younger people as well. New technology has improved the artificial parts, allowing them to withstand more stress and strain. A more important factor than age in determining the success of hip replacement is the overall health and activity level of the patient.
For some people who would otherwise qualify, hip replacement may be problematic. For example, people with chronic diseases such as those that result in severe muscle weakness or Parkinson's disease are more likely than people without chronic diseases to damage or dislocate an artificial hip. Because people who are at high risk for infections or in poor health are less likely to recover successfully, doctors may not recommend hip replacement surgery for these patients.
What Does Hip Replacement Surgery Involve?
The hip joint is located where the upper end of the femur meets the acetabulum. The femur, or thigh bone, looks like a long stem with a ball on the end. The acetabulum is a socket or cup-like structure in the pelvis, or hip bone. This "ball and socket" arrangement allows a wide range of motion, including sitting, standing, walking, and other daily activities.
During hip replacement, the surgeon removes the diseased bone tissue and cartilage from the hip joint. The healthy parts of the hip are left intact. Then the surgeon replaces the ball and the socket with new, artificial parts. The new hip is made of materials that allow a natural, gliding motion of the joint. Hip replacement surgery usually lasts 2 to 3 hours.
Sometimes the surgeon will use a special glue, or cement, to bond the new parts of the hip joint to the existing, healthy bone. This is referred to as a "cemented" procedure. In an uncemented procedure, the artificial parts are made of porous material that allows the patient's own bone to grow into the pores and hold the new parts in place. Doctors sometimes use a "hybrid" replacement, which consists of a cemented femur (ball) part and an uncemented acetabular (socket) part.
Is a Cemented or Uncemented Prosthesis Better?
Cemented prostheses were developed 40 years ago. Uncemented prostheses were developed about 20 years ago to try to avoid the possibility of loosening parts and the breaking off of cement particles, which sometimes happen in the cemented replacement. Because each person's condition is unique, the doctor and patient must weigh the advantages and disadvantages to decide which type of prosthesis is better.
For some people, an uncemented prosthesis may last longer than cemented replacements because there is no cement that can break away. And, if the patient needs an additional hip replacement (which is likely in younger people), also known as a revision, the surgery sometimes is easier if the person has an uncemented prosthesis.
The primary disadvantage of an uncemented prosthesis is the extended recovery period. Because it takes a long time for the natural bone to grow and attach to the prosthesis, people with uncemented replacements must limit activities for up to 3 months to protect the hip joint. The process of natural bone growth also can cause thigh pain for several months after the surgery.
Research has proven the effectiveness of cemented prostheses to reduce pain and increase joint mobility. These results usually are noticeable immediately after surgery. Cemented replacements are more frequently used than cementless ones for older, less active people and people with weak bones, such as those who have osteoporosis.
What Can Be Expected Immediately After Surgery?
Patients are allowed only limited movement immediately after hip replacement surgery. When the patient is in bed, the hip usually is braced with pillows or a special device that holds the hip in the correct position. The patient may receive fluids through an intravenous tube to replace fluids lost during surgery. There also may be a tube located near the incision to drain fluid and a tube (catheter) may be used to drain urine until the patient is able to use the bathroom. The doctor will prescribe medicine for pain or discomfort.
How Long Are Recovery and Rehabilitation?
On the day after surgery or sometimes on the day of surgery, therapists will teach the patient exercises that will improve recovery. A respiratory therapist may ask the patient to breathe deeply, cough, or blow into a simple device that measures lung capacity. These exercises reduce the collection of fluid in the lungs after surgery.
A physical therapist may teach the patient exercises, such as contracting and relaxing certain muscles, that can strengthen the hip. Because the new, artificial hip has a more limited range of movement than an undiseased hip, the physical therapist also will teach the patient proper techniques for simple activities of daily living, such as bending and sitting, to prevent injury to the new hip. As early as 1 to 2 days after surgery, a patient may be able to sit on the edge of the bed, stand, and even walk with assistance.
Usually, people do not spend more than 10 days in the hospital after hip replacement surgery. Full recovery from the surgery takes about 3 to 6 months.
When Is Revision Surgery Necessary?
Hip replacement is one of the most successful orthopaedic surgeries performed--more than 90 percent of people who have hip replacement surgery will never need revision surgery. However, because more younger people are having hip replacements, and wearing away of the joint surface becomes a problem after 15 to 20 years, revision surgery is becoming more common. Revision surgery is more difficult than first-time hip replacement surgery, and the outcome is generally not as good, so it is important to explore all available options before having additional surgery.
Doctors consider revision surgery for two reasons: if medication and lifestyle changes do not relieve pain and disability, or if x rays of the hip show that damage has occurred to the artificial hip that must be corrected before it is too late for a successful revision. This surgery is usually considered only when bone loss, wearing of the joint surfaces, or joint loosening shows up on an x ray. Other possible reasons for revision surgery include fracture, dislocation of the artificial parts, and infection.
