{"id":177131,"date":"2026-08-13T08:55:42","date_gmt":"2026-08-13T08:55:42","guid":{"rendered":"https:\/\/pabau.com\/?p=177131"},"modified":"2026-08-13T09:36:41","modified_gmt":"2026-08-13T09:36:41","slug":"pinch-grip-test","status":"publish","type":"post","link":"https:\/\/pabau.com\/fr\/blog\/pinch-grip-test\/","title":{"rendered":"Pinch grip test: How to perform, score, and interpret it"},"content":{"rendered":"
\n
\n \"Key\n

Key takeaways<\/h3>\n <\/div>\n
\n
\n
\n \n \n <\/svg>\n <\/div>\n

The pinch grip test screens the anterior interosseous nerve by asking the patient to make an O with the thumb and index finger.<\/p>\n <\/div>\n

\n
\n \n \n <\/svg>\n <\/div>\n

A positive result is pulp-to-pulp contact instead of a true O, which points to weakness in the flexor pollicis longus and index profundus.<\/p>\n <\/div>\n

\n
\n \n \n <\/svg>\n <\/div>\n

Quantitative testing uses a calibrated pinch gauge to record lateral, tip, and palmar pinch, then compares the mean of three trials against published norms.<\/p>\n <\/div>\n

\n
\n \n \n <\/svg>\n <\/div>\n

The most-used adult norms come from Mathiowetz and colleagues, published in pounds, so record your gauge model and units before comparing anyone to a table.<\/p>\n <\/div>\n

\n
\n \n \n <\/svg>\n <\/div>\n

Practice management software like Pabau keeps serial pinch readings in the client record, so the trend stays visible across a rehabilitation episode.<\/p>\n <\/div>\n <\/div>\n <\/div>\n \n\n\n

The pinch grip test targets the anterior interosseous nerve (AIN), a motor branch of the median nerve. You ask the patient to touch the tip of the thumb to the tip of the index finger. If that O collapses into a flat, pinched shape, the AIN becomes the prime suspect.<\/p>\n\n\n\n

That same movement has a second, quantitative life. With a calibrated gauge, pinch strength turns into a number you can defend in a report and track week by week. Both versions live or die on setup.<\/p>\n\n\n\n

A collapsed O points straight at the anterior interosseous nerve<\/h2>\n\n\n\n

A positive pinch grip test means the patient cannot form a true tip-to-tip O shape. The thumb and index finger meet pulp to pulp instead, flat and wide.<\/p>\n\n\n\n

That substitution happens because two muscles have stopped pulling. The flexor pollicis longus (FPL) bends the thumb at its end joint, and the flexor digitorum profundus (FDP) bends the index fingertip. Both take their nerve supply from the AIN.<\/p>\n\n\n\n

So the shape of the failure is the finding. The distal joints stay straight, the pinch flattens, and most patients have no idea anything looks unusual. For physical therapy practices<\/a> and hand therapy services, this is one of the quickest screens in the upper-limb examination.<\/p>\n\n\n\n

The AIN carries no sensation, which makes it easier to spot<\/h2>\n\n\n\n

The AIN branches off the median nerve in the proximal forearm, near the two heads of pronator teres. It is purely motor, so it supplies no skin at all.<\/p>\n\n\n\n

That detail does a lot of diagnostic work. Motor weakness in the thumb and index finger with normal sensation points to the AIN. Numbness or tingling suggests the problem sits elsewhere, and a wider run of hand nerve tests<\/a> will help place it.<\/p>\n\n\n\n

Three muscles sit downstream of the nerve:<\/p>\n\n\n\n

    \n
  1. Flexor pollicis longus:<\/strong> the only flexor of the thumb end joint, so the thumb straightens out during pinch when it weakens.<\/li>\n\n\n\n
  2. Flexor digitorum profundus to the index finger:<\/strong> the index fingertip then fails to curl, which completes the flat pinch.<\/li>\n\n\n\n
  3. Pronator quadratus:<\/strong> also AIN supplied, though its weakness is hard to isolate at the bedside and usually shows up on electrophysiology.<\/li>\n<\/ol>\n\n\n\n

    Thenar wasting alongside a positive test changes the picture. Chronic compression of the median nerve at the wrist is the more common cause of that pairing. Think about a higher or mixed lesion rather than an isolated AIN problem.<\/p>\n\n\n\n

    Lateral, tip, and palmar pinch each answer a different question<\/h2>\n\n\n\n

    Three pinch patterns show up in hand therapy, and they are not interchangeable. Lateral pinch reads highest, tip pinch reads lowest, and palmar pinch lands between the two.<\/p>\n\n\n\n\n\n\n\n\n\n\n
    Pinch type<\/th>\nAlso called<\/th>\nHow the hand sits<\/th>\nWhat it tells you<\/th>\n<\/tr>\n<\/thead>\n
    Lateral pinch<\/td>\nKey pinch<\/td>\nThumb pad against the side of the index middle phalanx<\/td>\nEveryday functional strength, such as turning a key<\/td>\n<\/tr>\n
    Tip pinch<\/td>\nTwo-point pinch<\/td>\nThumb tip against index fingertip<\/td>\nPrecision work, and the clearest signal of FPL weakness<\/td>\n<\/tr>\n
    Palmar pinch<\/td>\nThree-jaw chuck<\/td>\nThumb pad against the pads of the index and middle fingers<\/td>\nHandling pens, lids, and other medium objects<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n

    Tip pinch matters most for AIN screening because fewer muscles share the load. A weak FPL shows up there first. Lateral pinch is the better measure of day-to-day function, which is why it appears in most return-to-work reports.<\/p>\n\n\n\n

    How to perform the pinch grip test in about five minutes<\/h2>\n\n\n\n

    Standardized positioning is not optional. Change the elbow angle or the chair height and the readings move with it, which makes side-to-side and session-to-session comparison meaningless.<\/p>\n\n\n\n

    Position the patient before you touch the gauge<\/h3>\n\n\n\n