Articular Surface Replacement of Hip Joint
Cobalt-chrome cast parts. Parts are precision machined to fit each other with small space for body fluid to lubricate. The backside of the cup has a roughened surface to allow bone to grow into implant. Nearly all major implant makers either have in production or are developing metal-on-metal hip resurfacing components
Advantages of Hip Resurfacing
Femoral head is preserved.
• Femoral canal is preserved and no associated femoral bone loss with future revision. Also, the risk of microfracture of femur with uncemented stem implantation is eliminated.
• .Larger size of implant “ball” reduces the risk of dislocation significantly.
• Stress is transferred in a natural way along the femoral canal and through the head and neck of the femur. With the standard THR, some patients experience thigh pain as the bone has to respond and reform to less natural stress loading.
• Use of metal rather than plastic reduces osteolysis and associated early loosening risk.
• Use of metal has low wear rate with expected long implant lifetime.
Activity
Some patients experience back discomfort after surgery. This is caused by the general soreness of the hip area and partly by the prolonged lack of movement required before, during, and after surgery. Periodic change of position helps to relieve discomfort and prevents skin breakdown.
The dislocation rate is very low.
There will be some precautions, mostly to prevent dislocation, which is more likely to occur the first six to eight weeks after surgery. These precautions include:
1. Using 2-3 pillows between your legs and not crossing your legs
2. Not bending forward 90 degrees
3. Using a high-rise toilet seat
Initial rehabilitation
The first day after surgery you will be assisted to a reclining chair, and physical therapy may begin. You will gradually begin to take steps, walk, and learn to climb stairs with the aid of a walker or crutches. This initial rehabilitation generally takes 4-6 days. During this time, discomfort may be experienced while walking and exercising. Pain medication will be ordered by the doctor as needed. Most patients are relieved of their painful pre-surgical hip condition.
Therapy and rehabilitation program
Following surgery, you will work with a physical therapist to become independent in walking, going up and down stairs, getting in and out of bed, and doing exercises to improve the range of motion and strength of your hip. You will be instructed by your physical therapist in a specific home exercise program to meet your needs.
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