Radiographic Manifestation of Hip Dislocation
after Total Hip Arthroplasty
Varah Yuenyongviwat MD*,
Khanin Iamthanaporn MD*, Thossart Harnroongroj MD**
Affiliation :
* Department of Orthopaedic Surgery and Physical Medicine, Faculty of Medicine,
Prince of Songkla University, Songkhla, Thailand
** Department of Orthopaedics Surgery, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
Objective : The authors hypothesized that a patient who has posterior hip dislocation after total hip replacement does not
have the same clinical manifestations of malposition as with a natural hip. The present study aimed to study clinical
manifestation of hip dislocation after total hip arthroplasty.
Material and Method: Thirty-five cases of posterior dislocation after total hip replacement were retrospectively studied by
medical records and radiographic evaluation. The study included leg position after hip dislocation, leg length, and leg
abduction/adduction angles.
Results : External rotation of the patient’s leg was found in 13 cases (37.1%), neutral position in six cases (17.2%), and
internal rotation in 16 cases (45.7%). Measurements of the femoral shaft-vertical axis angle found adduction in 17 cases
(average 17.4 degrees, range 1-25 degrees), abduction in 15 cases (average 6 degrees, range 1-15 degrees), and 0 degrees
in three cases. Average leg shortening was 3.55 cm (range 0.6-13.5 cm).
Conclusion : The present study shows that patients with hip dislocation after hip replacement can manifest many signs of
limb deformity in rotation (internal, external, and neutral) and abduction/adduction positions.
Keywords : Total hip replacement, Dislocation, Clinical manifestation, Leg position
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