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, 7 (2), 293-305
eCollection

Functional Leg Length Discrepancy Between Theories and Reliable Instrumental Assessment: A Study About Newly Invented NPoS System

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Functional Leg Length Discrepancy Between Theories and Reliable Instrumental Assessment: A Study About Newly Invented NPoS System

Asmaa Mahmoud et al. Muscles Ligaments Tendons J.

Abstract

Background: In spite the instinct social&financial impact of Leg Length Discrepancy (LLD), controversial and conflicting results still exist regarding a reliable assessment/correction method. For proper management it's essential to discriminate between anatomical&functional Leg Length Discrepancy (FLLD). With the newly invented NPoS (New Postural Solution), under the umbrella of the collaboration of PRM Department, Tor Vergata University with Baro Postural Instruments srl, positive results were observed in both measuring& compensating the hemi-pelvic antero-medial rotation in FLLD through personalized bilateral heel raise using two NPoS components: Foot Image System (FIS) and Postural Optimizer System (POS). This led our research interest to test the validity of NPoS as a preliminary step before evaluating its implementations in postural disorders.

Methods: After clinical evaluation, 4 subjects with FLLD have been assessed by NPoS. Over a period of 2 months, every subject was evaluated 12 times by two different operators, 48 measurements in total, results have been verified in correlation to BTS GaitLab results.

Results: Intra-Operator&inter-operator variability analysis showed statistically insignificant differences, while inter-method variability between NPoS and BTS parameters expressed a linear correlation.

Conclusion: Results suggest a significant validity of NPoS in assessment&correction of FLLD, with high degree of reproducibility with minimal operator dependency. This can be considered a base for promising clinical implications of NPoS as a reliable cost effective postural assessment/corrective tool.

Level of evidence: V.

Keywords: anatomic leg length discrepancy; functional leg length discrepancy; hemi-pelvic rotation; lower limb inequality; new postural solution; personalized heel raise; postural assessment.

Conflict of interest statement

Conflict of interest The Authors have no conflict of interest.

Figures

Figure 1 A, B
Figure 1 A, B
A) The subject was asked to flex the trunk forward over the hip joints, while the physician holds the GT with the thumb resting on PSIS bilaterally. B) The subject was asked to assume the standing position again.
Figure 2
Figure 2
FIS Infra-Red camera.
Figure 3
Figure 3
Structure and components of the FIS system.
Figure 4
Figure 4
Static instrumental FIS examination.
Figure 5
Figure 5
Images obtained by FIS system.
Figure 6 A, B
Figure 6 A, B
Information detected by acquisition without and with heels through POS system. a) Without heel raise. b) With heel raise.
Figure 7
Figure 7
Parameters acquired from POS and BTS.
Figure 8
Figure 8
Regression lines for measurements without heels (linear parameters).
Figure 9
Figure 9
Regression lines for measurements with heel (linear parameters).
Figure 10
Figure 10
Bland-Altman for measurements with heels (linear parameters, operator A).
Figure 11
Figure 11
Bland-Altman for measurements with heels (linear parameters, operator B).
Figure 12
Figure 12
Bland-Altman for measurements with heels (linear parameters, operator A).
Figure 13
Figure 13
Bland-Altman for measurements with heels (linear parameters, operator B).

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