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Preservation of the PCL when performing cruciate-retaining TKA: Is the tibial tuberosity a reliable predictor of the PCL footprint location?

  • A. JawharEmail author
  • A. S. Kadavkolan
  • S. Wasnik
  • H. P. Scharf
  • H. RoehlEmail author
Knee

Abstract

Purpose

Reconstruction of the joint line is crucial in total knee arthroplasty (TKA). A routine height of tibial cut to maintain the natural joint line may compromise the preservation of the PCL. Since the PCL footprint is not accessible prior to tibial osteotomy, it seems beneficial to identify a reliable extraarticular anatomic landmark for predicting the PCL footprint and being visible within standard TKA approach. The fibula head predicts reliably the location of PCL footprint; however, it is not accessible during TKA. The aim of this study now was to analyze whether the tibial tuberosity can serve as a reliable referencing landmark to estimate the PCL footprint height prior to tibial cut.

Methods

The first consecutive case series included 216 CR TKA. Standing postoperative lateral view radiographs were utilized to measure the vertical distance between tibial tuberosity and tibial osteotomy plane. In the second case series, 223 knee MRIs were consecutively analyzed to measure the vertical distance between tibial tuberosity and PCL footprint. The probability of partial or total PCL removal was calculated for different vertical distances between tibial tuberosity and tibial cutting surface.

Results

The vertical distance between the tibial tuberosity and tibial cut averaged 24.7 ± 4 mm. The average vertical distance from tibial tuberosity to proximal and to distal PCL footprint was found to be 22 ± 4.4 and 16 ± 4.4 mm, respectively. Five knees were considered at 50 % risk of an entire PCL removal after CR TKA.

Conclusions

Current surgical techniques of tibial preparation may result in partial or total PCL damage. Tibial tuberosity is a useful anatomical landmark to locate the PCL footprint and to predict the probability of its detachment pre-, intra-, and postoperatively. This knowledge might be useful to predict and avoid instability, consecutive pain, and dissatisfaction after TKA related to PCL insufficiency.

Level of evidence

III.

Keywords

Cruciate-retaining total knee arthroplasty Posterior cruciate ligament Tibial cut Tibial tuberosity 

Notes

Conflict of interest

All authors declare that there are no conflicts of interest.

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Copyright information

© European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2014

Authors and Affiliations

  1. 1.Orthopaedic and Trauma Surgery CenterUniversity Medical Center Mannheim of University HeidelbergMannheimGermany
  2. 2.Department of OrthopaedicsHiranandani Orthopaedic Medical EducationMumbaiIndia

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