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Video Movement Analysis Using Smartphones ViMAS: A Pilot Study
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Smartphone versus knee ligament arthrometer when size does not matter.

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Summary

A new smartphone app, SmartJoint, accurately measures anterior tibial translation (ATT) in knees with anterior cruciate ligament (ACL) deficiency. This portable, inexpensive tool offers reliable results comparable to traditional methods.

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Medical Device Technology

Background:

  • Traditional mechanical methods for measuring anterior tibial translation (ATT) in anterior cruciate ligament (ACL)-deficient knees are often bulky and expensive.
  • There is a need for accessible, portable, and cost-effective tools to assess knee joint stability.

Purpose of the Study:

  • To evaluate the performance of a novel smartphone application (SmartJoint) for measuring ATT in ACL-deficient knees.
  • To compare the accuracy and reliability of SmartJoint against a standard mechanical device (KT 1000).

Main Methods:

  • A dedicated smartphone application, SmartJoint, was developed.
  • Two observers measured ATT in 35 ACL-deficient patients using both KT 1000 and SmartJoint on involved and uninvolved knees.
  • Interclass correlation coefficient (ICC) was used to assess intertest, interobserver, and intra-observer reliability, with ICC > 0.75 indicating excellent reproducibility.

Main Results:

  • SmartJoint demonstrated high correlation with the KT 1000, with intertest ICCs of 0.797 for uninvolved and 0.987 for involved knees.
  • Interobserver reliability was excellent for both devices, with SmartJoint achieving ICCs of 0.957 (uninvolved) and 0.992 (involved).
  • Mean ATT measurements were comparable between SmartJoint and KT 1000.

Conclusions:

  • The SmartJoint application performs comparably to the KT 1000 for measuring ATT in ACL-deficient knees.
  • SmartJoint offers a portable, noninvasive, accurate, reliable, and inexpensive method for characterizing ATT.
  • This technology has the potential for widespread accessibility in clinical settings for evaluating ACL injuries.