– See: – Extensor Tendon Rupture – Extensor Digitorum Communis – Extensor Mechanism of Digits – Anatomy of EDC: – note that EDC is less tolerant of shortening than FDS due to differential in tendon excursion (50 mm compared to 70 mm, respectively); – references: – The terminal tendon … Read more
– Anatomy: Origin: the forepart of the supralateral surface of the Calcaneus;lateral talocalcaneal ligament and cruciate crural ligament; Insertion: braches into 3 tendons that insert into the lateral sides of the tendons of EDL of 2nd, 3rd, & 4th toes at the level of the MTP joint; Action: extends the … Read more
– See: – Forearm Extensors: – Extensor Tendon Laceration – origin: lateral epicondyle of humerus; – tunnel IV: – narrow retinaculum over dorsum of wrist forms pulley system for extensor tendons; – above the wrist its four slips spread out joined together by juncturae; … Read more
– Discussion: – extension type accounts for 95% of cases, & is caused by a fall on outstretched hand with hyperextension of the elbow; – anterior periosteum is torn; – there may be a significant amount of local bleeding and swelling; – nerves & blood vessels are contused, compressed, … Read more
– See: Forearm Extensors : – Anatomy: – origin: lateral condyle of humerus; – insertion: – this tendon inserts into the base of 3rd metacarpal and is in direct relationship with the ECRL, which inserts into the base of the 3rd metacarpal; … Read more
– See: Forearm Extensors: – Anatomy: – origin: lower 1/3 of lateral epicondyle & supracondylar ridge; – insertion: posterior surface of base of second metacarpal; – action: extends and abducts the hand at the wrist; – synergists: ECRB, ECU; – nerve supply: radial, … Read more
– See: Forearm Extensors : – Anatomy: – origin: 2 heads from lateral epicondyle & middle 1/3 of posterior ulna; – insertion: – posterior surface of base of 5th metacarpal; – ECU is the only wrist extensor that lies in its own fibro-osseus tunnel; – action: extends and adducts the hand at the wrist; – … Read more
– See: Forearm Extensors: – Anatomy: – origin: common extensor tendon off lateral epicondyle; – insertion: tendon of extensor digitorum at proximal phalanx of little finger & into dorsal expansion of finger extensor tendons; – action: – extends proximal phalanx of little finger at MP … Read more
– See: Phalangeal Injury – Discussion: – takes advantage of stabilizing forces of flexor & intrinsic on phalanges with the MP joint held in 90 deg flexion; – intact dorsal extensor mechanism functions as “tension band” to palmar cortex, and helps maintain the reduction; – digital rotation … Read more
– Discussion: – in elderly pts w/ comminuted frx, excision of up to 50% of olecranon can be well tolerated (no instability) – if distal surface of semilunar notch of ulna & coronoid are not injured upto 80% of olecranon may be excised w/o producing instability; – … Read more