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Comparing Isolated Thumb Force Generation, Wrist Rotation, and Clinical Measurements in Healthy and Osteoarthritic
Nicole Arnold1, Adam Chrzan1, Kevin Chan2
1Mechanical Engineering, Michigan State University, East Lansing, MI 48824, USA.
Bioengineering (Basel, Switzerland)
|September 27, 2024
Summary
This study developed a new device to measure isolated thumb force after surgery for thumb carpometacarpal osteoarthritis. Results show current clinical tools may misjudge recovery, highlighting the need for precise force measurement in hand therapy.
Area of Science:
- Orthopedics
- Biomechanics
- Hand Surgery
Background:
- Thumb carpometacarpal (CMC) osteoarthritis (OA) involves joint degeneration at the thumb base.
- Standard clinical tools for measuring thumb force are often imprecise, utilizing multiple digits.
- Accurate measurement of isolated thumb force is crucial for evaluating surgical outcomes.
Purpose of the Study:
- To research the effect of thumb force after ligament reconstruction with tendon interposition surgery.
- To develop a device for collecting isolated thumb forces.
- To compare normative and clinical data with isolated thumb force measurements.
Main Methods:
- A novel testing device was created to collect isolated thumb forces.
- Normative thumb force data were collected from males and females.
- Thumb force was measured in various wrist positions and directions (push/pull) to mimic daily activities.
Main Results:
- Older participants generated greater forces than younger participants.
- Post-surgery, only 50% of CMC OA participants showed significant improvement, not reaching healthy force levels.
- Wrist position affected push and pull forces in OA participants, with different trends observed compared to standard clinical tools.
Conclusions:
- Isolated thumb force measurement provides a more accurate assessment of recovery post-surgery than standard clinical tools.
- The developed device and data sets can help surgeons and therapists create specialized treatment plans.
- Current clinical evaluation methods may underestimate or overestimate recovery from CMC OA surgery.
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