Hand Grip Function Assessed by the Box and Block Test Is Affected by Object Surfaces

Study DesignN/A.BackgroundOne of the hand function assessment tools is the Box and Block Test (BBT).PurposeTo examine if the BBT score is affected by grip surfaces.MethodsThirteen adults performed the BBT with wooden, rubber-covered, and paper-covered blocks. The BBT scores and time for seven movements (finger closing, contact to lift-off, transport before barrier, transport after barrier, release, return, and reach) were compared across the three block types.ResultsThe mean BBT score was 8% higher for the rubber blocks than the paper and wooden blocks (p < 0.01) due to the reduced time for contact to lift-off (when the finger touches a block until the block is lifted).ConclusionsHand function assessments should be controlled for object surfaces. Therapists may vary grip difficulties by changing object surfaces. Redesigning daily objects with high-friction surfaces may increase grip function.Level of EvidenceN/A.