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Intraoperative factors affecting conversion from cruciate retaining to cruciate substituting in total knee arthroplasty

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The purpose of this study was to analyse the factors affecting the conversion from posterior cruciate ligament (PCL)-retaining (CR) to PCL-substituting (PS) prostheses during total knee arthroplasty (TKA).

Methods

A total of 920 TKAs, which had been preoperatively planned to undergo implantation of CR-type prostheses, were reviewed retrospectively. Of these, 83 knees (9.0 %) were converted intraoperatively to PS prostheses. The clinical and radiological factors of the non-converted (CR) and converted (PS) groups were compared. Clinically, age, gender, body mass index, angle of flexion contracture, size of the femoral component, and thickness of the polyethylene insert were compared between the CR and PS groups. Radiologically, the severity of the varus deformity and the posterior tibial slope angle (PSA) were compared between the CR and PS groups.

Results

No significant differences in age, gender, body mass index, range of motion, thickness of the polyethylene insert, or severity of varus deformity were identified. The average preoperative angle of flexion contracture was 5.9° ± 7.4° in the CR group and 8.1° ± 9.1° in the PS group (p = 0.002). The average preoperative PSA was 9.6° ± 4.0° in the CR group and 11.0° ± 5.0° in the PS group (p = 0.018). The conversion rates to a PS-type femoral component of size C, D, and E were 13.1, 7.0, and 6.3 %, respectively (p = 0.004).

Conclusion

The conversion rate from CR- to PS-type prostheses was high in patients with severe flexion contracture, steep posterior slope, and a small femoral component size. These factors should be carefully considered for appropriate selection of prosthesis type.

Level of evidence

IV.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University Seoul, 23 Kyunghee-daero, Dongdaemun-gu, Seoul, 024447, Korea

    Dae Kyung Bae, Sang Jun Song, Kang Il Kim, Dong Hur & Hyun Ho Lee

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  1. Dae Kyung Bae
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  2. Sang Jun Song
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  3. Kang Il Kim
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  4. Dong Hur
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Correspondence to Sang Jun Song.

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Bae, D.K., Song, S.J., Kim, K.I. et al. Intraoperative factors affecting conversion from cruciate retaining to cruciate substituting in total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 24, 3247–3253 (2016). https://doi.org/10.1007/s00167-015-3971-3

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