Spinal Factors Influencing Change in Pelvic Sagittal Inclination From Supine Position to Standing Position in Patients Before Total Hip Arthroplasty

We aimed to evaluate the effects of pelvic tilt on polyethylene wear after total hip arthroplasty (THA). A total of 105 joints treated with primary THA were included; conventional polyethylene (CPE) liners were used in 43 hips and highly cross-linked polyethylene (HXLPE) liners were used in the remaining 62 hips. The pelvis was tilted 6° posteriorly in the standing position as compared to the supine position, which resulted in significant increases of 1.7° and 2.8° in cup inclination in the CPE and HXLPE groups, respectively. Moreover, the change in pelvic tilt resulted in significant increases of 3.6° and 4.9° in cup anteversion in the CPE and HXLPE groups, respectively. For the CPE group, multiple regression analysis showed a significant association between the angle of pelvic tilt (PTA) and cup inclination and the polyethylene wear ratio. The adjustedR2of the regression model was larger for measures obtained in the standing position as compared to the supine position. For the HXLPE group, there was no significant relationship between radiographic parameters and polyethylene wear. Close observation of polyethylene wear is recommended for patients with severe posterior pelvic tilt who have undergone THA with conventional polyethylene.

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Factors Influencing Deep Vein Thrombosis Following Total Hip Arthroplasty Under Epidural Anesthesia

Anesthesia & Analgesia ◽

10.1213/00000539-199304000-00014 ◽

1993 ◽

Vol 76 (4) ◽

pp. 765???771 ◽

Cited By ~ 17

Author(s):

Nigel E. Sharrock ◽

Chitranjan S. Ranawat ◽

Barbara Urquhart ◽

Margaret Peterson

Keyword(s):

Deep Vein Thrombosis ◽

Total Hip Arthroplasty ◽

Hip Arthroplasty ◽

Epidural Anesthesia ◽

Total Hip ◽

Vein Thrombosis ◽

Factors Influencing ◽

Deep Vein

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Factors Influencing Total Hip Arthroplasty in Obese Patients

Operative Techniques in Orthopaedics ◽

10.1053/j.oto.2017.05.004 ◽

2017 ◽

Vol 27 (3) ◽

pp. 164-167 ◽

Cited By ~ 2

Author(s):

Menachem M. Meller ◽

Aaron Y. Meller

Keyword(s):

Total Hip Arthroplasty ◽

Hip Arthroplasty ◽

Obese Patients ◽

Total Hip ◽

Factors Influencing

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Comparison of accuracy of cup position using portable navigation versus alignment guide in total hip arthroplasty in supine position

Hip International ◽

10.1177/1120700020908788 ◽

2020 ◽

pp. 112070002090878 ◽

Cited By ~ 2

Author(s):

Masanori Okamoto ◽

Masashi Kawasaki ◽

Toshiaki Okura ◽

Satoshi Ochiai ◽

Hiroyuki Yokoi

Keyword(s):

Total Hip Arthroplasty ◽

Hip Arthroplasty ◽

Supine Position ◽

Navigation System ◽

Direct Anterior Approach ◽

Navigation Systems ◽

Total Hip ◽

Navigation Group ◽

Portable Navigation ◽

Alignment Guide

Background: Accelerometer-based portable navigation systems in supine total hip arthroplasty (THA) have been developed, but there are no reports on the accuracy of cup placement. We aimed to investigate and compare the accuracy of the accelerometer-based portable navigation system versus the acetabular alignment guide placed on the pelvis in THA using the direct anterior approach (DAA). Both devices tracked changes in the pelvic position. Methods: In this single-centre, retrospective study, we reviewed 115 hips in 113 patients who underwent primary THA via the DAA using an accelerometer-based portable navigation system in the supine position (portable navigation group) and 106 hips in 101 patients who underwent THA using an acetabular alignment guide (alignment guide group) as controls. Hips were evaluated postoperatively using computed tomography to measure cup orientation. The accuracy of cup orientation was compared between the 2 groups. Results: Absolute values of inclination error were 3.1° ± 2.2° and 2.9° ± 2.3° ( p = 0.708) in the portable navigation and alignment guide groups and those of anteversion error were 2.8° ± 2.3° and 3.7° ± 2.7°, respectively ( p = 0.005). The number of cups placed within 10° of error was 98.3% and 96.2% in the portable navigation and alignment guide groups, respectively ( p = 0.304). The portable navigation group had significantly more hips (72.2%) placed within a 5° margin of error than did the alignment guide group (56.6%) ( p = 0.016). Conclusion: High accuracy in cup placement was achieved using accelerometer-based portable navigation in supine THA. Using a navigation system may contribute to improved long-term outcomes.

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