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High Tibial Osteotomy Alone Does Not Decrease Medial Meniscus Extrusion in the Setting of Medial Meniscus Posterior

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Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
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Summary

High tibial osteotomy (HTO) alone does not reduce medial meniscus extrusion (MME) in medial meniscus posterior root tears (MMPRT). Medial meniscus repair (MMR) alone decreases MME, and HTO combined with MMR further reduces MME.

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Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Medical imaging

Background:

  • Medial meniscus posterior root tears (MMPRT) can lead to medial meniscus extrusion (MME).
  • High tibial osteotomy (HTO) aims to alter knee alignment and load distribution.
  • The effect of HTO alone on MME in MMPRT is not well understood.

Purpose of the Study:

  • To evaluate if HTO alone can decrease MME in knees with MMPRT.
  • To compare MME in different knee conditions: intact, MMPRT, medial meniscus repair (MMR), HTO + MMR, and HTO + MMPRT.

Main Methods:

  • Eight human cadaveric knees were tested using robotic system and ultrasound.
  • Specimens underwent five conditions: intact, MMPRT, MMR, HTO + MMR, and HTO + MMPRT.
  • Medial meniscus extrusion was measured under axial load at 0°, 30°, and 90° flexion.

Main Results:

  • HTO + MMPRT did not significantly differ in MME compared to MMPRT alone.
  • MMR significantly reduced MME compared to MMPRT alone.
  • HTO + MMR showed a significant reduction in MME compared to MMR alone.

Conclusions:

  • HTO alone does not decrease MME in MMPRT.
  • MMR is effective in reducing MME after MMPRT.
  • Combining HTO with MMR may offer additional benefits in reducing MME.