Hand Function After 70: Grip Is Not The Whole Story

Grip strength is widely measured because it predicts broad health outcomes. It is a poor description of what hands actually do, and the tasks that fail first depend on other capacities.

Grip and pinch are different measurements

A power grip wraps the whole hand around an object, using the large forearm flexors, and it is what a dynamometer measures.

A precision pinch holds an object between thumb and fingertips, relying on small intrinsic hand muscles and on fine control rather than on gross force.

Most frustrating daily tasks are pinch tasks: buttons, jar lids, keys, medication blister packs and zips all fail before anything requiring a power grip does.

The intrinsic muscles decline distinctly

The small muscles within the hand are supplied by nerves with a long course, and they show early loss of motor units in ageing.

Visible thinning between the thumb and index finger is a common sign, and it reflects loss of tissue rather than simple thinning of overlying fat.

Because these muscles position the fingers rather than generate large force, their decline shows as clumsiness and dropped objects rather than as weakness.

Sensation matters as much as strength

Gripping an object safely requires knowing how firmly it is being held, and that feedback comes from receptors in the skin of the fingertips.

Receptor density and sensitivity fall with age, so people apply more force than necessary to be certain of holding something securely.

Where diabetes or another cause of neuropathy is present, this degrades further, and objects are dropped despite normal measured strength.

Joints and tendons add their own limits

Osteoarthritis at the base of the thumb is common and specifically impairs pinch, since that joint bears high load during any pinching movement.

Tendon problems, including triggering of a finger and thickening in the palm, restrict movement independently of muscle strength.

Morning stiffness that eases within an hour differs from stiffness that persists, and the distinction is one of the things a clinician asks about.

What can be assessed and adapted

Hand therapists assess pinch, dexterity, sensation and joint range separately, because interventions differ according to which component is limiting.

Adaptations are often simple: wider handles reduce the pinch requirement, and jar openers and pill organisers remove the tasks most likely to fail.

Sudden weakness, numbness in a specific nerve distribution, or rapid loss of function is a different situation and needs prompt assessment.