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31 January 2020 : Clinical Research  

Comparison of Clinical Outcomes, Radiological Outcomes and Bone Remodeling Outcomes Between Proximal Coated Single-Wedge New Stem and Full Coated Dual-Wedge Classic Stem in 1-Stage Bilateral Total Hip Arthroplasty

Hongpeng Hu1ACDEF, Zeming Liu1EF, Bo Liu1AE, Xuzhuang Ding1BC, Sikai Liu1C, Tao Wu1C, Wenhui Ma1E, Yongtai Han1ACEF*

DOI: 10.12659/MSM.921847

Med Sci Monit 2020; 26:e921847

Abstract

BACKGROUND: This retrospective study investigated the clinical outcomes, radiological outcomes, and bone remodeling patterns associated with a Medial/Lateral Taper (M/L Taper) stem and Link Classic Uncemented (LCU) stem in 1-stage bilateral total hip arthroplasty (THA).

MATERIAL AND METHODS: The results of 52 patients who underwent 1-stage bilateral THA with a M/L Taper stem on one side and an LCU stem on the other between January 2012 and February 2015 were retrospectively compared. Patients were clinically assessed by the Harris hip score (HHS), visual analogue score (VAS) and incidence of complications. Radiological indicators were measured. Periprosthetic bone remodeling was assessed via bone mineral density (BMD) measurements.

RESULTS: The mean follow-up time was 5.2 years. At each follow-up, there was no difference in the HHS and VAS between the 2 groups. The neck-shaft angle, offset, vertical height of the rotational center and limb lengthening were lower in the M/L Taper group than in the LCU group (P<0.001). The Engh total score was lower in the LCU group (P=0.039). Significantly higher (P<0.001) BMDs were observed in the M/L Taper group in Gruen zones 1, 2, and 6. significantly lower (P<0.001) BMDs were observed in the M/L Taper group in Gruen zones 3 and 5.

CONCLUSIONS: Due to the increased postoperative neck-shaft angle, the full coated dual-wedge classic stem was prone to cause lower limb lengthening. The proximal coated single-wedge new stem patients were more likely to have an insufficient postoperative neck length. The new stem achieved load transfer and proximal fixation, leading to better proximal femoral bone preservation is more in line with human biomechanical characteristics.

Keywords: Arthroplasty, Replacement, Hip, Bone Density, Femur Head Necrosis, Hip Prosthesis, Aged, Bone Remodeling, Lower Extremity, Middle Aged, Treatment Outcome

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750