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Patellar Tendon-Lateral Trochlear Ridge Distance Measurement as an Indicator of Patellar Instability With

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Summary
This summary is machine-generated.

Patellar tendon-lateral trochlear ridge distance (PT-LTR) is a significant measurement for patellar maltracking in patients with instability. Higher PT-LTR values indicate potential benefit from combined soft tissue and bony realignment procedures.

Keywords:
MPFLpatellar instabilitypatellar maltrackingpatellofemoral pain

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Area of Science:

  • Orthopedic surgery
  • Biomechanical analysis
  • Radiographic imaging

Background:

  • Multiple radiographic measurements exist for patellar instability and maltracking.
  • Patellar tendon-lateral trochlear ridge distance (PT-LTR) has not been explored for patellar maltracking in instability.

Purpose of the Study:

  • Assess PT-LTR in patients with instability and malalignment.
  • Determine if PT-LTR indicates maltracking alongside instability.
  • Explore PT-LTR relationship with patellar height and tibial tubercle-trochlear groove distance (TT-TG).

Main Methods:

  • Cross-sectional study with Level of evidence 3.
  • Three patient groups: ACL reconstruction (ACLR), isolated medial patellofemoral ligament reconstruction (MPFLR), and combined MPFLR with tibial tubercle transfer (TTT).
  • Intraclass correlation coefficients (ICCs) assessed PT-LTR measurement agreement; statistical tests analyzed data.

Main Results:

  • Mean PT-LTR differed significantly between groups (P < .0001).
  • ACLR group: 1.15 ± 3.71 mm; MPFLR group: 6.60 ± 6.58 mm; MPFLR+TTT group: 12.72 ± 8.43 mm.
  • Higher PT-LTR observed in patients with patella alta, elevated TT-TG, or both.

Conclusions:

  • Mean PT-LTR was significantly higher in the MPFLR+TTT group compared to ACLR and isolated MPFLR groups.
  • PT-LTR may indicate patellar maltracking in patellar instability.
  • PT-LTR could predict patients benefiting from combined soft tissue and bony realignment procedures.