6,7,8,9 Questions

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Week 6 Anatomy and Kinesiology of the Wrist Proximal Row: o Scaphoid (navicular) Most commonly fx Proximal pole has poor blood supply Kidney shaped 3 regions (proximal pole, waist, distal pole) o Lunate Most commonly dislocated, contact with radius Poor intrinsic ligament support Cresent shaped o Triquetrum Complex shape o Pisiform Sesamoid for FCU “pea shape” Proximal origin of FDM Enveloped within tendon of FCU Distal Row: o Trapezium (greater multangular) Distal surface- saddle shaped and articulates with base o f 1 st MCP Medial articular surface, flat and articulates with trapezoid Proximal-slightly concaved and articulates wit distal pole of scaphoid Anterior (anterolateral) edge of trapezium forms an overhand referred to as beak which is apart of the fibro osseous tunnel for tendon of FCR o Trapezoid o Capitate Central point of carpus o Hammate Ulnar nerve passes beneath hook of hammate 1. Pl ea se expl ain: a. Sca phoi d mot ion i n fl exi on and ext ens ion 1. Scaphoid progressively supinates with wrist extension  b. Lunate moti on in f lexion a nd exten sion 1. Least magnitude of rotation during flex/ext (of all carpals) c. Tri quet rum moti on in fl exi on and e xte nsi on 1. .. 2. What is t he relat ionshi p between t he dista l carpa l and proxi mal carp al rows i n radial and ulnar deviation? a. Proximal carpal row displays “reciprocation” motion with distal row  b. RD – proximal row flexes and ulnar deviates

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