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Abstract Objective To compare the force line data of lower limbs measured on the full-length piece with that measured by the portable force line measuring device based on the inertial sensor unit under different motion modes，to explore the appropriate posture for measuring the force line of lower limbs，and to evaluate its feasibility and accuracy.Methods 15 healthy adult volunteers weared portable power line measuring device based on the inertial sensing unit designed for this study.Hip flexion movement，abducent movement，rotation movement and supine knee straight downward hip flexion movement and outreach were performed when the patients standed with knee straight.Hip-knee-ankle angle (HKA) and mechanical axis deviation (MAD) mechanical lateral distal femur angle，mLDFA and the medial proximal tibia angle (MPTA) of the tibia were measured.Full-length X-ray films of lower limbs were taken for all 15 volunteers.The HKA angle，MAD value，mLDFA and MPTA of lower limbs were measured by three physicians respectively.The force lines and angle data measured by the two methods were compared and analyzed.Results There were no significant differences in HKA，MAD，mLDFA and MPTA values between volunteers in the sagittal plane of the lower extremity in supine position and those measured on the fulllength radiographs of the lower extremities (P＞0.05).The HKA，MAD，mLDFA and MPTA values measured in standing sagittal plane，standing coronal plane，standing rotatory motion and supine coronal plane were statistically different from those measured in full-length radiographs (P＜0.05).Further consistency analysis showed that the data obtained by the lower extremity force line measurement device in the supine sagittal plane were in good consistency with the data measured by the fulllength film of both lower extremities.Conclusion When the subjects are in supine position and performed hip flexion motion in sagittal plane，the portable lower limb force line measurement device based on inertial sensor unit can replace the full length of the lower limb to measure the HKA，MAD，mLDFA and MPTA of normal subjects.
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Corresponding Authors:
Wang Wei
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