Insertion of a pressure sensing arrayminimally affects hindfoot bone kinematics

Area of Science:

• Biomechanics
• Orthopedics
• Medical Engineering

Background:

• Ankle osteoarthritis (OA) development is poorly understood, with links to joint loading.
• Intra-articular pressure measurement during gait simulation is a key method for assessing joint loading.
• Potential kinematic disturbances from pressure sensor arrays require investigation.

Purpose of the Study:

• To quantify the effect of inserting a pressure sensing array on the range of motion (ROM) of ankle and hindfoot joints.
• To evaluate the potential impact of pressure sensors on joint kinematics during simulated gait.

Main Methods:

• In-vitro gait simulations were performed on 7 cadaveric feet using a custom cadaveric gait simulator (CGS).
• Joint ROM was measured before and after the insertion of a pressure sensing array.
• Gait simulations mimicked the stance phase duration of one second.

Main Results:

• The insertion of a pressure sensing array had a limited effect on the ROM of all hindfoot joints.
• Observed ROM changes did not exceed the natural variability found in specimens without sensors.
• No consistent directional change (increase or decrease) in ROM was detected across specimens.

Conclusions:

• The findings suggest that pressure sensing arrays have a minimal effect on ankle joint kinematics during simulated gait.
• The minimal impact indicates potential for using pressure sensors in gait analysis for OA research.
• The necessity of evaluating sensor effects against specific application requirements is highlighted.