Enneking (MSTS) Staging for Malignant Bone Tumors Stage Grade Site Metastasis IA Low Intra-compartmental None IB Low Extra-compartmental None IIA High Intra-compartmental None IIB High Extra-compartmental None III Any Any Regional or Distant Low-grade tumors generally have few mitotic figures, little if any cellular atypia, and have a relatively non-infiltrative…
Category: PGMEE, MRCS, USMLE, MBBS, MD/MS
Medical knowledge in bullet points with understandable language, simplified images and graspable mnemonics.
PGMEE, MRCS, USMLE, MBBS, MD/MS
Posterolateral corner (PLC) of knee
Anatomy of PLC 3 major static stabilizers of PLC Lateral collateral ligament Popliteus tendon Popliteofibular ligament Other static stabilizers of PLC Lateral capsule thickening Arcuate ligament Fabellofibular ligament Dynamic stabilizers of PLC Biceps femoris Popliteus muscle Iliotibial band (ITB) Lateral head of gastrocnemius There are 2 “Y” shaped structures in…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Osteogenesis Imperfecta : Mnemonic
Synonym: Brittle Bone Disease Incidence: 1 in 20,000 Gene defect: Col1A1 (17q) and Col1A2 (7q) Mnemonic: Remember “one” for “bone”. Collagen one is the main composition of bone. OI is a disorder of bone. Hence, the defect is is in Col1. Features Mnemonic: BLOOD Sillence Type Inheritance Features Mnemonic Collagen…
PGMEE, MRCS, USMLE, MBBS, MD/MS
BIND score in severe hyperbilirubinemia
Bilirubin-induced neurologic dysfunction (BIND) Score is used to assess bilirubin induced encephalopathy in neonates with severe hyperbilirubinemia. Johnson et al developed the BIND score to help identify an infant who requires more aggressive monitoring and management. The scoring system has 3 parameters: 1. Cry pattern 2. Behavior and mental status…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Linea Aspera
Linea aspera is a ridge of roughened surface on the posterior surface of the shaft of femur which serves as a site for attachment of muscles and intermuscular septum. The various structures attached to linea aspera can be remembered using few mnemonics: Mnemonic 1#: 1, 2, 3 It gives attachment…
PGMEE, MRCS, USMLE, MBBS, MD/MS
Stress, Strain, Viscoelastic behavior
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….
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…