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A Modest Proposal for Stair Descent in the Elderly
Falls on stairs are common among older adults, and forward falls during descent are associated with high injury risk. Being elderly myself and having a number of stairs in my home I have given this issue some thought. Current fall-prevention guidance appropriately emphasizes handrail use, lighting, stair design, and strength and balance training. However, comparatively little attention has been given to task-modification strategies that alter how stair descent is performed.
I wonder whether an oblique stair-descent orientation—approximately 60 degrees relative to the direction of the stairs, rather than fully forward or fully sideways—may reduce fall risk during descent in some older adults.
This orientation would combine several independently supported safety mechanisms:
1. It naturally enforces slower, deliberate descent, discouraging step skipping and rapid cadence.
2. It shortens the effective step length, potentially reducing overstepping and foot overhang.
3. It reduces forward momentum, which is strongly associated with injurious stair falls.
Dear Dr. Kimata,
Thank you for sharing your reflection, which is very relevant from a clinical, functional, and biomechanical perspective. Your proposal for an oblique descent of stairs in older adults aligns with several existing lines of evidence, although, as you rightly point out, this specific approach has not yet been directly studied.
I would like to contribute some elements from the literature that support the plausibility of your proposal:
1. Speed, control, and risk of falls
It is well documented that greater speed and less control during stair descent significantly increase the risk of falls and injuries in older adults. Biomechanical studies show that rapid descent increases the anterior displacement of the center of mass and the eccentric demand on the quadriceps and ankle, which raises the risk of loss of balance.
Novak & Brouwer, 2011; Hamel et al., 2005
Their proposal, by inducing a slower and more deliberate descent, aligns with current recommendations for reducing dynamic load and anterior momentum.
2. Reduction of Forward Impulse
Falls forward on stairs are especially associated with serious injuries. Control of anterior body impulse has been identified as a critical factor during descent, especially in older adults with reduced eccentric braking capacity.
Startzell et al., 2000; Zietz et al., 2011
The oblique orientation you describe could decrease this forward impulse, as you correctly suggest.
3. Stride Length and Foot Placement
There is evidence that excessively long strides and errors in foot placement during descent are related to tripping and falls. Strategies that reduce effective stride length increase accuracy and stability.
Francksen et al., 2020; Ackermans et al., 2019
In this sense, their observation regarding the functional reduction of stride length is biomechanically consistent.
4. Handrail Use as a Key Protective Behavior
Handrail use is one of the most strongly supported strategies for preventing falls on stairs. It allows for load redistribution, improves mediolateral stability, and reduces the risk of loss of balance.
Maki et al., 2008; Bateni & Maki, 2005
Their emphasis on the oblique orientation maintaining this protective behavior is especially relevant and clinically prudent.
5. Lateral or Oblique Strategies in Rehabilitation
Although a 60° angle has not been specifically studied, side stepping is used in geriatric and neurological rehabilitation as a safer strategy for individuals with weakness, fear of falling, or asymmetries, demonstrating lower speed, greater control, and better stability.
Reid et al., 2010; Den Otter et al., 2007
Your proposed oblique descent seems to integrate advantages of both frontal (pre-visualization) and lateral (control and reduced momentum) descents, making it particularly interesting.
Conclusion
Although there is currently no direct evidence evaluating an oblique descent on stairs as you describe it, your proposal is solidly supported by biomechanical principles and indirect results from multiple lines of research on postural control, speed, handrail use, and lateral strategies.
I fully agree that this is a biomechanically plausible, clinically reasonable, and easily verifiable strategy that deserves formal study through controlled trials or observational studies.
Your approach makes a valuable contribution to the task modification approach, which is still underdeveloped in the prevention of falls on stairs, and opens a promising avenue for future research.
References (for guidance only)
Startzell JK et al. (2000). Stair negotiation in older people: a review. J Am Geriatr Soc.
Hamel KA et al. (2005). Biomechanical analysis of stair descent in older adults. Clin Biomech.
Novak AC, Brouwer B. (2011). Sagittal and frontal plane joint moments during stair descent in older adults. Gait Posture.
Zietz D et al. (2011). Momentum control in stair descent. Gait Posture.
Ackermans T et al. (2019). Foot placement errors and falls on stairs. J Biomech.
Franksen N et al. (2020). Step length and fall risk on stairs. Clin Biomech.