Abstract:
Background:Cup malalignment increase impingement, dislocation, cup migration, and polyethylene wear. Screw fixation for enhanced stability is the preferred option in cases of doubtful primary cup stability. There have been few studies about alignment changes after screw fixation, which may be another cause of cup malalignment. This study aimed to evaluate cup alignment change after screw fixation. Materials and Methods:Patients undergoing imageless navigation total hip arthroplasty using screws fixation for acetabular cup were corrected. After the press-fit cup was fully seated, the cup orientation was recorded. After screws were inserted, the cup orientation was recorded again to calculate the alignment change. Results:There were 99 cases with a mean age 63.7 years (25-93). Alignment change after screw fixation was found in 73 cases (73.7%). There were 56 cases (56.6%) with inclination angle change and the mean change was 2.21° (0°-8°). The inclination angle increased in 47 cases (47.5%) with 9 cases (9.1%) increased by 5° or more and decreased in 9 cases (9.1%). There was statistically significant difference between patients using one screw and patients using two or more screws in inclination angle change, 1.56° (0°-5°) and 3.4° (0°-8°), respectively (P = 0.0039). There was statistically significant correlation between inclination angle change and number of screws (r = 0.5401, P < 0.01). There were 49 cases (49.5%) with anteversion angle change and the mean change was 1.67° (0°-5°). The anteversion angle increased in 31 cases (31.3%), decreased in 18 cases (18.2%) with two cases (2%) decreased by 5° or more. There was significant difference between patients using one screw and patients using two or more screws in anteversion angle change, 1.46° (0°-5°) and 2.21° (0°-5°), respectively (P = 0.009). There was significant correlation between anteversion angle change and number of screws (r = 0.284, P = 0.048). Conclusions:Changes in cup alignment after screw fixation were detected in most cases. It is one possible cause of cup malalignment.
journal_name
Indian J Orthopjournal_title
Indian journal of orthopaedicsauthors
Suksathien Y,Piyapromdee U,Tippimanchai Tdoi
10.4103/ortho.IJOrtho_451_18subject
Has Abstractpub_date
2019-09-01 00:00:00pages
618-621issue
5eissn
0019-5413issn
1998-3727pii
IJOrtho-53-618journal_volume
53pub_type
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