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Effect of patient-specific instrument on lowering threshold for junior physicians to perform total hip arthroplasty on developmental dysplasia of the hip patients

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Abstract

Purpose

To create a patient-specific instrument (PSI) in lowering the surgical experience requirement for junior physicians to perform total hip arthroplasty (THA) on developmental dysplasia of the hip (DDH) patients.

Methods

Combined with rapid prototyping technology, we created a PSI and established DDH hip model in vitro. We enrolled 48 junior physicians and randomly assigned them into two groups. After creation of the PSI, they performed simulated THA surgery on a full-scale hip model with or without PSI on DDH models. The planned prothesis orientation, post-operative prothesis orientation, and surgery time were recorded.

Results

The final cup inclination was 42.0 ± 0.8° in PSI group and 37.8 ± 2.0° in control group, while final cup anteversion was 16.0 ± 0.7° in PSI group and 24.7 ± 3.5° in control group. The △inclination in PSI group was smaller than that in control group (4.2 ± 0.5° vs 9.5 ± 1.4°, P < 0.01), so does △inclination (2.9 ± 0.4° in PSI group vs 15.2 ± 2.5° in control group, P < 0.01). The outlier percent was 8.3% in PSI group and 70.8% in control group (P < 0.01). At the same time, the PSI group did not prolong the operation time (P = 0.551).

Conclusion

The PSI can greatly increase the accuracy of placing the cup orientation and lower the threshold for junior physicians to perform THA on DDH patients. It could be a training tool for them to increase their THA surgical skills.

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Acknowledgments

We thank Hunan New Sense Intelligent Technology Company for the printing and scanning of the model.

Funding

This work was supported by National Natural Sciences Foundation of China (No. 81974360 and 81902308), and Graduate Research Project of Central South University (2018dcyj074).

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Authors and Affiliations

  1. Department of Sports Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China

    Han Xiao

  2. Digital Orthopaedic Laboratory, Xiangya Hospital, Central South University, Changsha, Hunan, China

    Han Xiao, Chenggong Wang, Da Zhong, Pengfei Lei, Yihe Hu & Shilong Su

  3. Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan, China

    Chenggong Wang, Da Zhong, Pengfei Lei, Yihe Hu & Shilong Su

Authors
  1. Han Xiao
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  2. Chenggong Wang
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  3. Da Zhong
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  4. Pengfei Lei
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  5. Yihe Hu
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  6. Shilong Su
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Correspondence to Da Zhong.

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Xiao, H., Wang, C., Zhong, D. et al. Effect of patient-specific instrument on lowering threshold for junior physicians to perform total hip arthroplasty on developmental dysplasia of the hip patients. International Orthopaedics (SICOT) 44, 1281–1286 (2020). https://doi.org/10.1007/s00264-020-04599-6

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  • DOI: https://doi.org/10.1007/s00264-020-04599-6

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