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Related Experiment Video

Updated: May 14, 2026

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Preliminary Experience with New Dual-Mobility System for Small Japanese Patients.

Kenji Kawate1, Tomohiro Teranishi1, Yumiko Kondo1

  • 1Department of Orthopedic Surgery and Operation Room, Nara Prefecture Seiwa Medical Center, Sango-Town, Nara 636-0802, Japan.

Journal of Clinical Medicine
|May 13, 2026
PubMed
Summary

This study evaluated a new dual-mobility system for total hip arthroplasty (THA) in smaller Japanese patients. The system demonstrated excellent stability, improved function, and suitability for the Japanese lifestyle.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Reconstructive Surgery

Background:

  • Dual-mobility cups are increasingly used in total hip arthroplasty (THA) to improve stability and range of motion.
  • Designing THA implants for specific patient populations, such as smaller statured individuals, is crucial for optimal outcomes.
  • Previous dual-mobility systems may not adequately address the anatomical and functional needs of Japanese patients.

Purpose of the Study:

  • To evaluate the preliminary clinical experience and functional outcomes of a novel dual-mobility system designed for smaller Japanese patients undergoing primary THA.
  • To assess the implant's stability, range of motion, and ability to facilitate culturally specific activities like Seiza and Zarei.
  • To determine the suitability of the new system for the anatomical characteristics and lifestyle of the Japanese population.
Keywords:
THAdual mobilitysmall patient

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Last Updated: May 14, 2026

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Main Methods:

  • Retrospective review of 29 primary THA cases in Japanese patients using the new dual-mobility system.
  • Hardinge lateral approach for acetabular cup insertion.
  • Evaluation of functional outcomes including the ability to perform Seiza (kneeling) and Zarei (sitting bow), Harris hip scores, and hip flexion. Radiographic assessment for bone ingrowth and implant stability.

Main Results:

  • No postoperative dislocations or metal allergies were observed in the 29 hips reviewed.
  • Significant improvement in Harris hip scores (39 to 89, p < 0.05) and mean hip flexion (75° to 90°, p < 0.05).
  • Increased ability to perform Seiza (8 to 23 patients) and Zarei (7 to 20 patients) postoperatively. Radiographic evidence of stable bone ingrowth in all cases.

Conclusions:

  • The novel dual-mobility system is well-suited for smaller Japanese patients, offering cups in sizes 42-66 mm and a deeper center of rotation for enhanced stability.
  • Improved instrumentation facilitates easier implantation.
  • Early clinical results indicate the system effectively restores function and accommodates the lifestyle demands of Japanese patients, including culturally specific sitting and bowing postures.