الفهرس 
Aim of the workOnly 14 pages are availabe for public view
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Abstract
Hemiarthroplasty, either unipolar or bipolar, has been advocated
for a variety of hip problems. Long-term problems associated with
hemiarthroplasty include acetabular articular cartilage degeneration
(generally experienced as either groin or buttock pain), femoral
loosening and subsidence causing thigh pain with the typical “startup”
pain, Dislocation, breakage of implant leading to loss of function,
peri-prosthetic fracture and prosthetic infection.
Hemiarthroplasty of the hip is short lived in active patients and
cannot be considered as bone preserving procedure as high rate of
acetabular and femoral deficiencies was found in spite of short period
after the primary hip surgery.
Conversion from failed hemiarthroplasty to total hip arthroplasty
was associated with many intraoperative problems such as acetabular
and femoral defects, intraoperative periprothetic fracture and
difficulties related to removal of the primary implants and cement.
Conversion surgery may associate with postoperative complications as
postoperative infection and dislocation.
Conversion arthroplasty found to be an excellent treatment
strategy for symptomatic failed hemiarthroplasty in terms of pain
relief and restoration of function and mobility as near as possible to
the pre-injury level. In this study it was noticed that:
Groin pain was the main presenting symptom for most of the
patients and the cause of this pain was either acetabular and/or
femoral side.
Summary and Conclusions
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Articular cartilage degeneration, acetabular defects and
protrusion and loosening of the component was the most
common cause of conversion.
Loss of bone stack in both acetabular and femoral sides is high
with hemiarthroplasty.
There is no difference in the functional outcome of bipolar
hemiarthroplasty and Monoblock hemiarthroplasty (Thompson
and Austin Moore).
The most common post-operative complication was dislocation.
Functional outcome improved after the conversion surgery
Hemiarthroplasty gives poor results in physically active patients,
even in elderly individuals and should not be recommended as bone
preserving procedure. If hemiarthroplasty is to be performed, Austin-
Moore prosthesis should be avoided.