Original Article
Acetabular Revision Surgery With the LOR Cup: Three to 8 Years' Follow-Up

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Abstract

A retrospective review was conducted to evaluate the mid-term results of the Längsovalen Revisionspfanne oblong revision cup. From July 1995 to March 2000, 41 acetabular revision surgeries were performed for aseptic loosening of the acetabular cup. The acetabular defects were classified as type 2A to 3B, according to Paprosky's criteria. Morselized bone grafts were used in 19 cases (45.2%) to fill cavitary defects. The mean postoperative follow-up was 63.5 months (range, 40-99 months). Clinical assessment at follow-up showed a significantly improved mean Harris Hip Score from 46 points preoperatively to 82.2 points postoperatively, whereas the x-ray examination did not show any sign of loosening of the cups. Data analysis showed that significantly better results were correlated with restoring the hip rotation center and reducing leg length discrepancy.

Section snippets

Materials and Methods

Between July 1995 and March 2000, 41 patients (28 women [68.3%] with 1 bilateral [2.4%] and 13 men [31.7%]) with acetabular defects underwent reconstructive surgery using 42 LOR cups (Sulzer, Zurich, Switzerland). The average age of the patients at revision surgery was 67.6 years (range, 30-86 years). There were 26 (61.9%) total hip revisions and 16 (38.1%) acetabular revisions; 35 (83.3%) of the cases were first-revision procedures and 7 (16.7%) were second-time revisions. Aseptic loosening

Results

The mean HHS significantly increased from 46 points (range, 18-71 points) preoperatively to 82.2 points (range, 50-100 points) at the follow-up assessment (P < .001).

According to the HHS at follow-up, 14 cups (35%) showed an excellent result, 10 (25%) had a good result, 9 scores (22.5%) were considered as a fair result, and 7 (17.5%) suffered a poor result.

Data analysis did not show any correlation between follow-up HHS and the preoperative acetabular bone stock loss, classified according to

Discussion

In the last decade, oblong-shaped cups have been developed to fill elongated bone defects of the acetabular cavity and to obtain a primary stable fixation on healthy bone with no need for massive bone grafts. In the literature, few reports concerning oblong cups can be found 7, 8, 10, 14, 15. Small number of cases, various designs, and follow-ups are frequently causes of different results. However, every author agrees in underlining that the main advantage of oblong cups is the possibility to

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