Stress or load: Force over area (has units of Newton per square metre) Strain or deformation: Change in length over original length caused by applied stress or load (unitless and expressed as ratio or percentage) Mnemonic: If your boss is under a lot of stress, his personality changes (strain) A….
Author: Epomedicine
PGMEE, MRCS, USMLE, MBBS, MD/MS
Pressure Sores and Bed Sores
A pressure injury is localized damage to the skin and underlying soft tissue usually over a bony prominence or related to a medical or other device. Normal capillary refill is 16-33 mmHg. Ischemia occurs with prolonged pressure >33 mmHg: Ischial tuberosity: >100 mmHg during sitting Sacral region: 40-60 mmHg in…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Motor March Phenomenon
Motor march phenomenon is a sign of reinnervation like Hoffman-Tinel’s sign which has been discussed earlier. Observed in: Axonotmesis Repaired Neurotmesis Not observed in: Neuropraxia Motor march phenomenon: As the re-innervation of injured nerve proceeds, the muscles nearest to the site of injury recovers first followed by distal ones sequentially…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Friedreich’s Ataxia : Mnemonic
Friedreich’s ataxia is a hereditary spinocerebellar degenerative disorder named after German neurologist, Professor Nicholaus Friedreich. Mnemonic: FRIEDREICH’S Ataxia 1. Foot deformity (progressive cavo-varus), Frataxin expression reduced 2. Recessive (autosomal), Repeat of trinucleotide GAA (chromosome 9) 3. Iron accumulation in mitochondria 4. Extensor plantar response 5. Dysarthria (within 5 years of…
PGMEE, MRCS, USMLE, MBBS, MD/MS
AO fracture classification made easy
It is an alpha-numeric system of classification developed by Muller and colleagues. Step 1: 1st digit specifies bone Step 2: 2nd digit specifies segment of bone Square definition: Proximal and distal segments are defined by a square whose sides = length of widest part of epiphysis Exceptions of square definition:…
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10 Causes of Periodontitis That Go Beyond Bad Oral Hygiene
Sometimes, in my line of work as a dentist, I have to break the bad news to patients regarding the state of their teeth and gums. It can be challenging to inform patients that they have gum disease, an infection of the gums that keep our teeth in place when…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Palmar Aponeurosis or Fascia
5 components a. Central aponeurosis It is triangular in shape with apex originating at the level of flexor retinaculum as a continuation of palmaris longus and thins and fans out distally. It has 3 dimensional fiber orientation: longitudinal, transverse and vertical 1. Longitudinal: Gives 4 pre-tendinous band (PTB) in the…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Rheumatoid hand
Ulnar drift or deviation of fingers Normal anatomical factors contributing to ulnar drift of fingers at MCP joint: Normal mechanical advantage of ulnar intrinsic muscles Asymmetry and ulnar slope of metacarpal heads of index and middle fingers Greater ulnar deviation permitted by radial collateral ligament when MCP joint is flexed…