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Article

The Sum of the Leg Length Discrepancy and the Difference in Global Femoral Offset Is Equal to That of the Contralateral Intact Side and Improves Postoperative Outcomes after Total Hip Arthroplasty: A Three-Dimensional Analysis

by
Norio Imai
1,*,
Yuki Hirano
2,
Yuki Endo
2,
Yoji Horigome
1,
Hayato Suzuki
2 and
Hiroyuki Kawashima
2
1
Division of Comprehensive Musculoskeletal Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
2
Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
*
Author to whom correspondence should be addressed.
J. Clin. Med. 2024, 13(6), 1698; https://doi.org/10.3390/jcm13061698
Submission received: 20 December 2023 / Revised: 11 March 2024 / Accepted: 13 March 2024 / Published: 15 March 2024
(This article belongs to the Special Issue Hip and Knee Replacement: Clinical Advances and Current Challenges)
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Abstract

Background/Objectives: Global femoral offset (GFO) and leg length discrepancy (LLD) affect outcomes after total hip arthroplasty (THA). Moreover, the sum of the difference in GFO between the THA and non-surgical sides and LLD (SGL) reportedly affects the outcomes in a two-dimensional evaluation. We examined the association of the GFO, LLD, and SGL with the Harris Hip Score (HHS) using a three-dimensional (3D) evaluation. Methods: We retrospectively surveyed 172 patients with hemilateral hip osteoarthritis who underwent THA. The GFO, LLD, and SGL were measured using the 3D pelvis and femur models; these models were adjusted for the pelvis and femur, and the coordinate systems were parallelized. Furthermore, their relationship with the modified HHS (mHHS) 1 year after THA was determined. Results: Significant correlations were found among mHHS, GFO, and SGL in the binomial group, whereas LLD was not significantly correlated. The optimal values of GFO and SGL were 1.01 mm and 0.18 mm/100 cm body height, respectively, which were considered optimal when the SGL values were approximately equal to those of the non-operative side. The optimal ranges for GFO and SGL were −1.65 to 3.67 mm and −4.78 to 5.14 mm/100 cm, respectively. Conclusions: Our findings were obtained after adjusting the pelvis and femur to a unified coordinate system. Therefore, the results of this study can be directly applied to 3D planning.
Keywords: total hip arthroplasty; global femoral offset; leg length discrepancy; Harris Hip Score; outcome total hip arthroplasty; global femoral offset; leg length discrepancy; Harris Hip Score; outcome

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MDPI and ACS Style

Imai, N.; Hirano, Y.; Endo, Y.; Horigome, Y.; Suzuki, H.; Kawashima, H. The Sum of the Leg Length Discrepancy and the Difference in Global Femoral Offset Is Equal to That of the Contralateral Intact Side and Improves Postoperative Outcomes after Total Hip Arthroplasty: A Three-Dimensional Analysis. J. Clin. Med. 2024, 13, 1698. https://doi.org/10.3390/jcm13061698

AMA Style

Imai N, Hirano Y, Endo Y, Horigome Y, Suzuki H, Kawashima H. The Sum of the Leg Length Discrepancy and the Difference in Global Femoral Offset Is Equal to That of the Contralateral Intact Side and Improves Postoperative Outcomes after Total Hip Arthroplasty: A Three-Dimensional Analysis. Journal of Clinical Medicine. 2024; 13(6):1698. https://doi.org/10.3390/jcm13061698

Chicago/Turabian Style

Imai, Norio, Yuki Hirano, Yuki Endo, Yoji Horigome, Hayato Suzuki, and Hiroyuki Kawashima. 2024. "The Sum of the Leg Length Discrepancy and the Difference in Global Femoral Offset Is Equal to That of the Contralateral Intact Side and Improves Postoperative Outcomes after Total Hip Arthroplasty: A Three-Dimensional Analysis" Journal of Clinical Medicine 13, no. 6: 1698. https://doi.org/10.3390/jcm13061698

APA Style

Imai, N., Hirano, Y., Endo, Y., Horigome, Y., Suzuki, H., & Kawashima, H. (2024). The Sum of the Leg Length Discrepancy and the Difference in Global Femoral Offset Is Equal to That of the Contralateral Intact Side and Improves Postoperative Outcomes after Total Hip Arthroplasty: A Three-Dimensional Analysis. Journal of Clinical Medicine, 13(6), 1698. https://doi.org/10.3390/jcm13061698

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