PMC5267444_01
Photograph showing the AMS-HA acetabular shell. Four nails for holding the polyethylene liner (four circle marks), and one prominently for rotation stability(arrow head mark).
TOORTHJ-10-732_F1.jpg
PMC5267444_01_TOORTHJ-10-732_F1.jpg
F1
AMS-HA acetabular shell (outer diameter 44mm, inner diameter 38mm) with a cross-linked polyethylene (XLPE) liner was set in the acetabulum with four screws and a cementless proximal-hydroxyappatite-coated femoral component (a PerFix-HA #13-M stem) was used along with a 26 mm zirconia ball (Kyocera Medical, Osaka, Japan). An AMS-HA acetabular shell is a push in type liner fixing format for gripping the groove of a liner with four clicks, having a structure whereby rotatable fixation contributes to one section (Fig. 1). The extracted XLPE liner was observed with partial damage in the elevated rim on the alternative side and end section surface along with scratches on the back side (Figs. 2c and 2d, Table 1). The extracted XLPE liner was observed with partial damage in the elevated rim of the alternative side and end section surface along with scratches on the back side (Fig. 3c and 3d, Table 1).
Photograph showing the Case 1. Nine years post-THA.
TOORTHJ-10-732_F2a.jpg
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F2
No problems were observed until 9 years following surgery (Fig. 2a); however, an aching pain and abnormal sound occurred in the right hip joint after 9 years and 8 months. A plain X-ray revealed that the right femoral head had deviated to the outer upper side of the acetabular socket; however, osteolysis was not observed in the vicinity of the acetabulum and femoral implant (Fig. 2b). The extracted XLPE liner was observed with partial damage in the elevated rim on the alternative side and end section surface along with scratches on the back side (Figs. 2c and 2d, Table 1).
Nine years and eight months post-THA. Radiographs demonstrated supralateral subluxation of the right femoral head from the acetabular component, but there was no loosening ofthe acetabular or femoral implants.
TOORTHJ-10-732_F2b.jpg
PMC5267444_01_TOORTHJ-10-732_F2b.jpg
F2b
Although no problems were observed till 9 years following surgery (Fig. 3a), inguinal pain in the right hip occurred at 9 years and 10 months following surgery. Although a plain X-ray revealed that the right femoral head had deviated to the outer upper side of the acetabular socket, osteolysis was not observed in the vicinity of the acetabulum and femoral implant (Fig. 3b). The extracted XLPE liner was observed with partial damage in the elevated rim of the alternative side and end section surface along with scratches on the back side (Fig. 3c and 3d, Table 1).