Variations involving the relationship between the sciatic nerve and the piriformis muscle are commonly classified based on Beaton and Anson’s classification. Mnemonic: I Prefer Smart Anatomy For Perfect nerve-sparing Type Mnemonic Meaning Description Prevalence I I Inferior Undivided sciatic nerve passes below piriformis 87% II Prefer Piercing Peroneal pierces, tibial…
Tag: Musculoskeletal system
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Iliac Cortical Density (ICD)
Synonym: Iliac Cortical Line Iliac cortical densities (ICD) are the overlap of the true pelvis posterior to the acetabulum which is used as a proxy for the slope of the sacral ala. Importance: The entry point should be anterior in S1 and inferior to the iliac cortical density (ICD), which…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Crowe Classification in Adult Hip Dysplasia
Crowe Classification Class I: <50% subluxation or proximal displacement <10% of pelvic height Class II: 50-75% subluxation or proximal displacement 10-15% of pelvic height Class III: 75-100% subluxation or proximal displacement 15-20% of pelvic height Class IV: >100% subluxation or proximal displacement >10% of pelvic height and deficient true acetabulum…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Coccyx Types
Postacchini and Massobrio Classification (Nathan Modification) Can be classified into 6 types: Type I (slight curve): Curved slightly forward with apex pointing caudally (>50% incidence) Type II (forward curve): More prominent ventral curvature with coccyx apex pointing anteriorly (8-32% incidence) Type III (sharp angle): Acute anterior angulation of coccyx but…
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Morel Lavallee Lesion
Definition: Post-traumatic closed degloving injury, in which the skin and subcutaneous tissue is detached from the underlying fascia by a shearing force which can disrupt perforating vessels and nerves, creating a potential space that fills with blood, lymph, debris and fat (necrotic and/or viable). Clinical features: The diagnosis can be…
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Frozen Shoulder : Mnemonics
Synonym: Adhesive capsulitis of shoulder Features: Mnemonic: ICE CAPS Sequence for Manipulation under anesthesia (MUA): Mnemonic: FEAR
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Ivory Vertebra : Mnemonic
Ivory vertebra refers to diffuse and homogenous increase in opacity of a vertebral body that retains size and contour with no change is size and opacity of adjacent intervertebral discs. Mnemonic: PH FILMS 1. Paget disease of bone 2. Hemangioma 3. Fluorosis 4. Infection (tubercular spondylitis) 5. Lymphoma (usually Hodgkin’s…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Thiocolchicoside vs Tizanidine vs Baclofen for Low Back Pain
Thiocolchicoside is widely used in acute muscular low back pain due to its fast-acting and less sedative profile. Tizanidine is better suited for chronic cases but requires monitoring due to sedative and hepatic effects. Baclofen is more useful for spasticity of CNS origin and is less commonly used for routine…