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Related Experiment Videos

Blocking screws for alignment control in intramedullary limb lengthening.

Julian Fürmetz1, Stefan Bösl1, James Schilling1

  • 13D-Surgery, Department of General, Trauma and Reconstructive Surgery, Munich University Hospital LMU, Germany.

Injury
|April 7, 2017
PubMed
Summary

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Blocking screws improve simultaneous deformity correction during intramedullary lengthening, offering a precise solution for leg length discrepancies and other deformities in a single operation.

Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering

Background:

  • Simultaneous deformity correction is crucial in intramedullary lengthening to prevent repeat surgeries.
  • Blocking screws offer potential for alignment control during osteotomy in metaphyseal bone.

Purpose of the Study:

  • To retrospectively analyze the precision of simultaneous deformity correction using intramedullary lengthening.
  • To evaluate the efficacy of blocking screws in achieving precise deformity correction.

Main Methods:

  • Retrospective analysis of 31 intramedullary lengthening procedures (2009-2011).
  • Assessment of planned versus final correction of the Hip-Knee-Ankle (HKA) angle.
  • Comparison of outcomes between patients with and without blocking screws.

Main Results:

Keywords:
AlignmentBlocking screwsDeformity correctionIntramedullary lengtheningMechanical axis deviationPoller screw

Related Experiment Videos

  • The average planned correction to the HKA was 2.4°, with an average final deviation of 1.7°.
  • Patients using blocking screws corrected a higher degree of deformity (mean 3.2° vs. 1.7°) with slightly better precision (mean 1.5° vs. 1.9°).

Conclusions:

  • Blocking screws are effective tools for precise deformity correction during intramedullary lengthening.
  • Using blocking screws on the concave side aids in successfully correcting leg length discrepancies and other deformities in one procedure.