Haptic biofeedback for improving compliance with lower-extremity partial weight bearing

Area of Science:

• Orthopedics
• Rehabilitation Engineering
• Biomechanics

Background:

• Post-orthopedic trauma and surgery, patients require restricted weight bearing on the affected limb.
• Conventional training methods often fail to ensure patient adherence to partial weight-bearing (PWB) protocols.
• Effective PWB compliance is crucial for optimal healing and recovery.

Purpose of the Study:

• To evaluate a novel haptic (vibrotactile) biofeedback system for improving PWB compliance.
• To compare the efficacy of haptic biofeedback against verbal instructions and bathroom scale training.

Main Methods:

• Thirty healthy participants were randomized into three groups: verbal instruction, bathroom scale, and haptic biofeedback.
• Participants aimed to maintain 25 lb of weight bearing (range: 15-35 lb) using crutches and a walking boot.
• A custom sensor provided real-time vibrotactile feedback to the haptic group when exceeding the target weight range.

Main Results:

• The haptic biofeedback group achieved significantly lower weight bearing (22.4±9.1 lb) compared to verbal instruction (60.3±30.5 lb) and bathroom scale (43.8±17.2 lb) groups (P<.05).
• As a percentage of body weight, the haptic group (14.5±6.3%) also demonstrated superior adherence versus verbal (40.2±19.3%) and scale (32.5±16.9%) groups (P<.05).

Conclusions:

• Haptic biofeedback is a superior method for enhancing PWB compliance in a controlled setting.
• This technology shows promise as an advancement over traditional physical therapy methods for orthopedic rehabilitation.
• Further investigation in clinical orthopedic trauma populations is warranted to confirm these findings.