Your geriatric patients commonly have lower back and hip pain. It is important to know if the patient has undergone any joint replacements. There are problems associated with jointre placements; such as loosing of one of the components, dislocation, fracture and infection.
The most common joint to be replaced is the hip. There are two basic types of total hip replacement arthroplasty (THA). One type is a metallic acetabular component which is cemented in place; the other is a metallic acetabular component which is not cemented but has metal protrusions on the acetabular side that fix it to the acetabular bone. (See figure.)
There are several complications associated with a THA. These complications include: dislocation, trochanteric avulsion or nonunion, heterotopic ossification, fracture and loosing or infection. Dislocation is an uncommon complication which occurs within the first few weeks following surgery, which is usually easily diagnosed. Trochanteric avulsion or nonunion is usually assessed within the first six month postoperative. Heterotopic ossification is a common sequela of a THA. The incidence varies from 15 to 20 percent. Mild degrees of heterotopic ossification generally cause no clinical disability.
A certain percentage of patient will develop extensive ossification resulting in limitation of motion. Fractures of the femur and the pelvis may occur intraoperatively and most are recognized at the time of surgery. Postoperative femoral fractures are of two types: a fracture of the femur following major trauma, commonly associated with serious auto accidents. The other type of fracture of the femur can occur spontaneously or following minor trauma. Common areas for these types of fractures to occur are at the tip of the femoral stem, areas where cortical thinning has occurred due to the initial reaming of the intrameduallary canal, misdirected screw holes, and areas of inadequate distribution of bone cement.
Fractures of the acetabulum can also occur due to over-reaming of the acetabulum, severe protrusio acetabuli, chronic loosening or infection with increased stresses, and perforation of the medial wall of the acetabulum during surgery. Stress fractures can also occur at the pubic ramus in patient that are osteoporotic.
Loosening and infection are the chief long-term complications of the THA and are the main problems that we might face when treating these patients. Loosening of a prosthetic component at the bone-cement interface may occur with or without associated infection. Conversely, deep infection is not always associated with component loosening. The incidence of deep infection has decreased in the past decade due to stringent prophylactic measures. There can, however, be a long latent period (up to eight years in some patients) with deep sepsis. Prosthetic loosening usually can be revised with success if there is no infection.
Infected components generally need to be removed. Unfortunately, the distinction between loosening and infection may be difficult, even with the use of multiple modalities. In general, if there is evidence of a radiolucent zone at the bone-cement interface which is 2mm or wider, infection and/or loosening is a definite possibility.
This finding is extremely important to evaluate and follow-up is required if there is any question regarding the bone-cement interface. Loosening of a prosthetic component not only can be associated with pain, but can result in fracture and dislocation depending on the location of the loosening. Care should be exercised when manipulating these patients once we have rule out any associated problem due to the THA. If the patient is very osteoporotic I would recommend avoiding any type of chiropractic adjustment that would place stress upon the hip joint or femur. Basically, to avoid any possible problems with patients that have a THA, it would be prudent to assess the pelvis and the involved hip with a simple x-ray of the pelvis and a view of the hip to include the distal most aspect of the stem of the femoral component. Comparing the present films with previous films can also be helpful if loosening or infection are suspected. If loosening or infection are suggested on the radiographic studies immediate referral to their orthopedic surgeon is your best option.
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