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Orthopaedic Proceedings
Vol. 102-B, Issue SUPP_10 | Pages 18 - 18
1 Oct 2020
Nunley RM Barrack RL Lawrie CM
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Introduction

Modular dual mobility (MDM) prostheses are increasingly utilized for total hip arthroplasty (THA) to mitigate the risk of postoperative instability in high risk patients. Short-term reports on clinical outcomes are favorable but there are few studies on young active patients. This study quantified proximal femoral stress shielding and metal ion release in MDM combined with modern cementless stem design in young active patients.

Methods

This was a prospective study of patients between 18 and 65 years of age, with a body mass index (BMI) < 35 kg/m2 and University of California at Los Angeles (UCLA) activity score > 6, who received a modular cobalt-chromium acetabular liner, highly crosslinked polyethylene mobile bearing, and cementless titanium femoral stem for their primary THA. DEXA scans were performed at 6 weeks postoperatively as a baseline, then again at 6 months, 1 year, 2 years and 5 years postoperatively as were metal ions.


Orthopaedic Proceedings
Vol. 101-B, Issue SUPP_12 | Pages 23 - 23
1 Oct 2019
Lawrie CM Barrack TR Abu-Amer W Adelani MA Clohisy JC Barrack RL Nunley RM
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Introduction

The utility and yield of the current practice of routine screening of asymptomatic patients after primary total hip arthroplasty (THA) and total knee arthroplasty (TKA) is unclear. The purpose of this prospective survey study was to determine the utility of the routine on year follow up visit primary THA and TKA.

Methods

We prospectively enrolled all patients undergoing primary THA and TKA. At one-year follow-up, patients were asked to complete a survey that asked about satisfaction with the and if they thought the visit was worthwhile. Surgeons also completed a survey which asked if any intervention was done, if any problems were diagnosed/avoided, and if the visit was worthwhile. Data was analyzed and compared between patients and surgeons, and was also compared to the need for any additional interventions


Orthopaedic Proceedings
Vol. 101-B, Issue SUPP_12 | Pages 8 - 8
1 Oct 2019
Lawrie CM Schloemann D Kazarian GS Barrack TN Barrack RL
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Background

The aim of this study was to determine the change in standing pelvic sagittal alignment and associated impact on functional acetabular component position at follow-up after total hip arthroplasty (THA).

Patients and Methods

A retrospective review was performed on 91 consecutive patients who had undergone primary THA by a single surgeon via a posterior approach in the lateral decubitus position. Of these, 41 patients had high quality standing AP pelvis radiographs preoperatively, at six weeks postoperatively, and at one year postoperatively available for analysis. Pelvic ratio was defined as the ratio between the vertical distance from the inferior sacroiliac (SI) joints to the superior pubic symphysis and the horizontal distance between the inferior SI joints. Apparent changes in the functional acetabular component position were determined from the change in pelvic ratio between the preoperative and one year postoperative standing AP pelvic radiograph. A change of at least five degrees was considered clinically meaningful.