Document Detail

Why does outer joint motion predominate in bipolar hip prosthesis? Experimental and clinical studies.
MedLine Citation:
PMID:  15762259     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Theoretically, the motion of a bipolar hip prosthesis is most likely to occur at the inner joint if the frictional coefficients are equal at both surfaces. However, many studies have suggested that most motion occurs at the outer joint. MATERIAL AND METHODS: We performed an analysis of motion in a cadaveric bone model and in 50 patients during fluoroscopic examination, to determine how the motion is distributed between the two joints and what factors contribute to this distribution. RESULTS: The motion distributions varied widely between the patients. However, there was a relative pre-ponderance (63-90%) of outer motion in all directions of leg movement in addition to a persistent coexistence of motion at both joints in 44 of 50 patients. This preponderance of outer motion was the result of an early impingement of the acetabular cup and structural differences between the two joints. INTERPRETATION: An adjustment of the positive eccentricity and a decrease in the frictional torque of the inner joint as a result of better lubrication and smoothness can be expected to improve the motion distribution, thus reducing the amount of acetabular erosion.
Sung Man Rowe; Jae Yoon Chung; Eun Sun Moon; Taek Rim Yoon; Hyoung Yeon Seo; Jae Joon Lee
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta orthopaedica Scandinavica     Volume:  75     ISSN:  0001-6470     ISO Abbreviation:  Acta Orthop Scand     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2005-03-14     Completed Date:  2005-03-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370352     Medline TA:  Acta Orthop Scand     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  701-7     Citation Subset:  IM    
Department of Orthopedics, Chonnam National University Hospital, Gwangju, Korea.
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MeSH Terms
Arthroplasty, Replacement, Hip* / methods
Femur Head Necrosis / physiopathology,  surgery
Follow-Up Studies
Hip Fractures / physiopathology,  surgery
Hip Joint / physiology*,  physiopathology,  radiography
Hip Prosthesis*
Middle Aged
Models, Biological
Range of Motion, Articular*

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