Two-point discrimination is used to assess recovery after digital nerve repair. What static two-point distance at the fingertip represents normal sensibility in adults?
- A 20 mm or more
- B 12 to 15 mm
- C 7 to 10 mm ✓
- D 2 to 5 mm
Correct answer: C. 7 to 10 mm
Explanation
Normal static two-point discrimination at the fingertip pulp is 3 to 6 mm, and values up to about 10 mm are considered useful protective tactile gnosis; the conventional pass threshold quoted in hand surgery texts is under 10 mm, making 7 to 10 mm the best answer among the options given. Distances of 12 mm or more indicate impaired discriminative sensation, though such hands still retain protective sensation and may be functionally acceptable.
Reference: Campbell's Operative Orthopaedics, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.