MCP Joints
What bony shape forms the MCP joint surface at the metacarpal head?
What is a convex metacarpal head?
Which CMC joint is a saddle joint?
What is the 1st CMC joint?
Which structure prevents hyperextension at the PIP joint?
What is the volar plate?
Which nerve passes through the carpal tunnel?
What is the median nerve?
A patient reports locking of the finger in flexion. Which structure is likely involved?
What is the A1 pulley?
Which structure tightens during MCP flexion to prevent abduction/adduction?
What is the collateral ligament?
Which motion combines abduction + flexion + medial rotation at the thumb?
What is opposition?
What tendon is primarily responsible for DIP flexion?
What is the flexor digitorum profundus (FDP)?
How many tendons pass through the carpal tunnel?
What is nine tendons + one nerve?
A patient has numbness in digits 4 and 5. What nerve is involved?
What is the ulnar nerve?
Which muscle group produces both MCP flexion and IP extension?
What are the lumbricals and interossei?
Which CMC joints are the most stable and least mobile?
What are CMC 2 and 3?
What deformity results from a PIP flexion + DIP hyperextension pattern?
What is a Boutonnière deformity?
What is a hallmark motor sign of carpal tunnel syndrome?
What is thenar muscle weakness (APB)?
A 70-year-old woman has nodules in the palm and finger contractures. What condition is likely?
What is Dupuytren’s contracture?
What arthrokinematic motion occurs during MCP flexion?
What is anterior roll + anterior slide?
Which ligament is the primary stabilizer preventing subluxation dorsally and radially at the 1st CMC joint?
What is the dorsoradial ligament?
Which joint is more commonly injured in ball-handling sports due to its larger ROM?
What is the PIP joint?
Which special test recreates symptoms by placing the wrist in full flexion?
What is Phalen’s test?
A patient has a fall onto an outstretched hand and now has wrist pain + dinner-fork deformity. What fracture?
What is a Colles fracture?
Which MCP joint is most commonly involved in trigger finger?
What is the 3rd or 4th MCP (most common)?
During thumb CMC opposition, which specific arthrokinematic motions occur at the trapezium–metacarpal joint in each plane, and how do these combine to produce true opposition?
Flexion: ulnar roll + ulnar slide
Abduction: anterior roll + posterior slide
Axial rotation: medial rotation of the metacarpal
These combined produce true opposition.
What causes Swan Neck deformity biomechanically?
What is volar plate laxity → PIP hyperextension → DIP flexion?
What are two differential diagnoses that mimic carpal tunnel?
What are pronator syndrome and cervical radiculopathy (C6)?
A patient cannot flex the DIP after a laceration, which tendon is likely injured?
What is the FDP tendon?