This document summarizes a proposed new physical examination technique called the Extended OK Sign (EOK). The EOK builds upon the traditional OK sign, which tests the median nerve, by incorporating additional movements to test other major hand nerves. Specifically, the EOK involves performing the OK sign followed by wrist extension to test the radial nerve, digit extension to test the posterior interosseous nerve, and digit abduction to test the ulnar nerve. Together these movements allow for a succinct screening of the major motor nerve functions of the hand using a single coordinated set of motions. While not replacing detailed neurological exams, the EOK provides a quick initial screening to identify potential motor deficits warranting further investigation.
4th year medical student's seminar presentation under supervision of orthopedic lecturer. Reference is from Dr. Sameh Doss Textbook of upper and lower limb, and also other multiple websites.
anatomy of median nerve,course in arm and struthers ligament, branches in the forearm, carpal tunnel and course in hand, high and low median nerve injuries, principles of surgical management, pronator teres syndrome, anterior interosseous nerve syndrome, open and endoscopic carpal tunnel release
4th year medical student's seminar presentation under supervision of orthopedic lecturer. Reference is from Dr. Sameh Doss Textbook of upper and lower limb, and also other multiple websites.
anatomy of median nerve,course in arm and struthers ligament, branches in the forearm, carpal tunnel and course in hand, high and low median nerve injuries, principles of surgical management, pronator teres syndrome, anterior interosseous nerve syndrome, open and endoscopic carpal tunnel release
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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1. MOJ Orthopedics & Rheumatology
Physical Examination: Extended OK Sign
Submit Manuscript | http://medcraveonline.com
Abbreviations: LOAF: Lumbricals, Opponens Pollicis, Abductor
Pollicis Brevis, and Flexor Pollicis Brevis; EOK: Extended OK;
MCPJ: Metacarpophalangeal Joint; PIPJ: Proximal Interphalangeal
Joint; DIPJ: Distal Interphalangeal Joint
Introduction
A neurological examination of the upper limb can be grossly
assessed through hand examination. Orthopaedic examination
techniques illicit signs which inform the clinician about the
integrity of motor and sensory nerves, as well as musculoskeletal
function.
In general, the advent of investigations has greatly challenged
the perceived need for physical examinations [1]. However,
modern thought is that history taking, physical examinations and
investigations now form one sequential diagnostic entity, where
one informs the other [1,2]. A study by Peterson et al. [3], echoed
by Roshan [4], quantified the relative utility of each component
of diagnosing and found that, in 76% of patients, history led the
doctor to the correct diagnosis and that physical examination
and investigations then served to increase confidence in that
diagnosis [3,4].
History taking guides physical examinations which in turn
determines which investigations would best aid in further analysis
of the patient’s presentation [5]. Using physical examination also
prevents waste of needless investigations [5].
Due to the nature of orthopaedics it is possible to readily
illicit signs from the musculoskeletal system, and therefore
physical examination skills are essential. Neurological upper limb
examination reproducibility were determined to be moderate
to excellent, and therefore demonstrated important diagnostic
benefits [6].
Therefore, although investigations may appear to overshadow
physical examinations, in reality their utility remains essential in
diagnostic practice. Therefore progress and the development of
new and improved techniques should be encouraged and pursued.
Anatomy Review
The hand is defined as the portion of the upper limb distal to
the radiocarpal joint, and is composed of 27 bones, 14 of which
are phalanges, 5 metacarpal bones, and 8 carpal bones.
Intrinsic and extrinsic muscles of the hand are responsible
for the wide range of broad and intricate movements. The
extrinsic muscles originate from the forearm whilst the intrinsic
muscles originate and terminate within the compartment of the
hand. Intrinsic muscles of the hand include: thenar, hypothenar,
interosseous muscles (four dorsal, and three volar), and the
lumbricals. The thenar eminence is found on the radial side of
the palm, and is made up of three muscles: The abductor pollicis
brevis superficially, which causes thumb abduction, flexor pollicis
brevis which causes thumb flexion, and opponens pollicis which
is deep to the abductor pollicis longus and facilitates opposition
of the thumb. The hypothenar eminence lies on the ulna side of
the palm and is made up of three muscles: Abductor digiti minimi,
flexor digiti minimi which causes flexion of the fifth digit, and
opponens digiti minimi. Palmaris brevis is sometimes considered
to be part of the hypothenar, however it is so thin it cannot be
distinguished from the three hypothenar muscles deep.
All hand muscles are innervated by three main nerves: Radial,
ulna, and median. These branch out from the brachial plexus,
which extends from the C5 to T1 spinal nerves.
Volume 9 Issue 2 - 2017
1
Arthroplasty Fellow, Department of Trauma and Orthopaedic,
Royal Liverpool University Hospital, UK
2
Senior House Officer, Department of Trauma and
Orthopaedic, Royal Liverpool University Hospital, UK
3
Orthopaedic Consultant, Department of Trauma and
Orthopaedic, Warrington and Halton Hospitals NHS
Foundation Trust, UK
*Corresponding author: Fabienne Marie-Louise Robertson,
BA, MBBS, MPH, Senior House Officer, Department of Trauma
and Orthopaedic, Royal Liverpool University Hospital,
Prescot St, Liverpool, L69 3GA, UK, Email:
Received: July 26, 2017 | Published: October 20, 2017
Research Article
MOJ Orthop Rheumatol 2017, 9(2): 00353
Abstract
This article presents an elaboration of the widely used neurological examination
OK sign, which by itself tests the anterior interosseous motor branch of the median
nerve. However, the OK sign has the potential to be incorporated into an examination
technique which tests several nerves simultaneously. The OK sign would continue
to test the anterior interosseous nerve, whilst a simultaneous wrist extension
additionally tests the radial nerve, metacarpophalangeal joint extension tests the
posterior interosseous nerve, and abduction of the third to fifth digits tests the ulna
nerve. This ensemble of manoeuvers has the ability to succinctly test the majority of
motor nerves of the hand in a single smooth set of movements. As this multi-motor
neurological test is a progression of the OK sign, the development has been called the
‘Extended OK’ sign; EOK.
Keywords: Physical examination; OK sign; Extended OK sign; EOK; Medial nerve;
Radial nerve; Ulna nerve; Motor innervation; Hand