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KMID : 0386720020140030187
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Journal of the Korean Hip Society
2002 Volume.14 No. 3 p.187 ~ p.193
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Dissociation of Polyethylene Liner after Total Hip Replacement Arthroplasty using Harris-Galant Cementless Acetabular Component
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Song Joo-Hyoun
Jeong Jin-Young
Lee Han-Yong
Koh Hae-Seok
Rhyu Kee-Won
Kang Yong-Koo
Hwang Hee-Ju
Kang In-Kyu
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Abstract
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Purpose: Among patients who underwent total hip replacement arthroplasty using Harris-Galante type Ⅰor Ⅱ cup, we compared those who required a revision operation due to dissociation of the polyethylene linear from the acetabular cup with those who had no problem after the same operation with the same prosthesis, in order to identify the causative factors and determine preventive and treatment methods for dissociation of the polyethylene liner.
Materials and Methods: Of 50 patients who underwent total hip replacement arthroplasty using Harris-Galante type Ⅰor Ⅱ cup between 1988 and 1995, 20 patients underwent revision operation for dissociation of the polyethylene liner from the acetabular cup (dissociation group), while 30 patients had no problem after the same operation with the same prosthesis (control group). We analyzed the two groups to compare the suspicious factors for dissociation of the olyethylene liner such as age, weight, occupation, preoperative activity, size of metal femoral head, diameter and inclination of acetabular cup, thickness of polyethylene liner, incidence of squatting position and postoperative range of hip motion.
Results: The average period between initial and revision operation was 5.4 years (4 to 7). There were 18 men and 2 women. There were 2 Harris-Galante Ⅰcups and 18 Harris-Galante Ⅱ cups. All locking mechanisms were clip type. There was no statistically significant difference among the suspicious factors for dissociation of the polyethylene liner between the two groups. A new acetabular component with bone graft was used for all 20 patients who underwent revision operation, because simple change of the polyethylene liner was not sufficient due to loosening or deformation of the clip.
Conclusion: The clip is not a proper locking mechanism for the polyethylene liner in total hip replacement arthroplasty. Another locking mechanism which can maintain firm fixation of the polyethylene liner with the acetabular cup should be developed and used.
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KEYWORD
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Total Hip Replacement Arthroplasty, Polyethylene liner, Dissociation, Locking mechanism
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