Total Hip Replacement Management – Physiotherapy
Human populations are ageing across the world, particularly in developed countries such as the USA, Europe and Japan, with some developing countries such as China set to follow them over the next decades. This will place a large burden on physiotherapy and medical services as countries struggle to cope with steadily increasing levels of osteoarthritis (OA), an age-related degenerative condition. OA is responsible for significant levels of medical expenditure, disability, pain and work loss and provision of services such as joint replacement will be a challenge. Quality of life improvements after medical interventions vary but for joint replacement are some of the highest of all medical procedures.
Hip replacement has a long history but the 1960s saw its development into a reliable procedure, with modern developments making it a predictable and very successful treatment for hip osteoarthritis.
In surgery the degenerative joint is excised and artificial components of alloy steel and plastic are substituted. The hip joint ball is removed and the socket cored out in preparation, the new ball and stem is inserted into pressurized cement in the femur and the new cup is pressed into cement in the socket. The two materials, steel alloy and ultra high density polyethylene, ensure very low friction in the joint similar to the original and contribute to low wear and long life of the joint.
Conservative treatment is always instituted initially but if the joint degeneration becomes severe then joint replacement is the remaining option. The surgeon removes the osteoarthritic joint surfaces and replaces them with new components which are made of steel alloy and ultra high density polyethylene. The ball of the hip is replaced by a metal ball and stem and inserted into pressurized cement in the femoral canal. The plastic socket is pushed into the cement in the prepared socket to complete replacement of the two surfaces. Using the two materials, very slippery plastic and highly polished metal, ensures very low joint friction and a long functional life under load. The physiotherapist will review the patient’s medical notes for their post-operative instructions and medical status and then assess the patient’s respiratory and lower limb function.
The patient continues with buttock, hip flexion, quadriceps and foot exercises regularly to encourage normal limb muscle function and help circulation. They take regular analgesia to reduce pain and assist in their ability to mobilise. Once safe they can mobilise independently at least three times a day to have a walk, go to the toilet and wash and dress. Sitting is encouraged as long as the chair is not low and they are not permitted to put their legs up when sitting.
Physiotherapists routinely teach and correct patients’ gait after hip replacement to improve joint movement, muscle strength and a normal walking pattern. On getting a patient up initially the physio will teach the “step to gait”, instructing the patient to place the crutches forward at first, place the operated leg between the crutches then following it by stepping to it with the unoperated leg. This technique is steady but slow and used when safety is key, and the next progression is to a “step through gait” where the unoperated leg then moves through past the operated leg into a more normal gait. The most advanced gait sees the operated leg and the crutches moving together at the same time and gait approaching normal.
Once they return for their follow up appointment at six weeks after operation patients have often achieved a good gait, reasonable hip strength and returned to some activities of daily living. The physio may advise a stick if they are unsteady, slow or older, and they can gradually regain their previous abilities provided they observe the precautions to prevent hip dislocation:
* Avoid crossing the legs in sitting.
* Weight bearing on the leg and rotating the body weight is unwise.
* Don’t flex the hip suddenly or above 90 degrees, such as by sitting in a low chair, sitting down too fast, crouching or leaning forward quickly to the feet.
* If an infection develops, for example chest, teeth or bladder, then the doctor should be informed as infections can settle in an artificial joint.
Jonathan Blood Smyth, editor of the Physiotherapy Site, writes articles about Physiotherapist, back pain, orthopaedic conditions, neck pain, injury management and physiotherapists in Edinburgh. Jonathan is a superintendant physiotherapist at an NHS hospital in the South-West of the UK.