Anatomy: Know Your Hand Inside Out
This artery most commonly provides the dominant contribution to the superficial palmar arch.
Ulnar artery
This maneuver assesses integrity of the FDS tendon.
Isolated PIP flexion with other digits held in extension
Loss of thumb opposition is most associated with injury to this nerve.
Median nerve
This is the most common metacarpal fracture.
Fifth metacarpal neck fracture (boxer’s fracture)
Failure of separation of digits during embryogenesis causes this condition.
Syndactyly
This carpal bone has the most variable vascular supply patterns.
Scaphoid
The most important pulley to preserve during flexor tendon repair.
A2 pulley
This tendon transfer is classically used to restore finger MCP extension in radial nerve palsy.
FCR to EDC (or FCU to EDC)
This zone of extensor tendon injury has the highest risk of adhesions and stiffness.
Zone IV
A “triphalangeal thumb” is most commonly associated with this anomaly.
Radial polydactyly
This muscle is the primary ulnar deviator of the wrist when acting alone.
Extensor carpi ulnaris
Daily Double
Zone II flexor tendon injuries are classically known by this nickname.
Loss of Froment sign correction after pinch suggests recovery of this muscle.
Adductor pollicis
This Mallet Doyle Classification is of a fracture fragment involving 20-50% of the articular surface.
Type IV-B
This thumb anomaly is most commonly associated with Holt–Oram syndrome.
Thumb hypoplasia
This artery supplies the dominant blood flow to the thumb.
Princeps pollicis artery
In flexor tendon repair, minimal gapping is the goal, with a gap of less than this amount considered the maximum permissible to allow for proper healing and function.
3 mm
This nerve transfer provides intrinsic reinnervation without sacrificing median nerve function.
AIN to ulnar motor branch (SETS transfer)
This radiographic sign predicts failure of nonoperative treatment in PIP fracture–dislocations.
Involvement of >40–50% of the articular surface or "V" sign with residual dorsal subluxation
This Blauth Classification is associated with pouce flottant.
Type IV
Daily Double
A total of this many bones constitute the basic skeleton of the wrist and hand.
This is the optimal force range (in N) in early active range of motion (AROM) protocols for flexor tendon repairs.
30 - 38 N
Large-amplitude, long-duration motor unit potentials on EMG are suggestive of this kind of nerve injury.
Chronic denervation rather than acute nerve injury
This ulnar-radial relationship is associated with Kienbock's disease.
Negative ulnar variance
This timing principle governs syndactyly release to avoid vascular compromise.
Staged release - avoiding simultaneous release of adjacent digits with shared neurovascular bundles