Unhappy triad

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Unhappy triad

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Development of the muscular system

Erb-Duchenne palsy

Klumpke paralysis

Thoracic outlet syndrome

Muscles of the thoracic wall

Vessels and nerves of the thoracic wall

Brachial plexus

Carpal tunnel syndrome

Anatomy clinical correlates: Wrist and hand

Vessels and nerves of the hand

Muscle weakness: Clinical

Vessels and nerves of the forearm

Muscles of the forearm

Anatomy clinical correlates: Median, ulnar and radial nerves

Muscles of the hand

Fascia, vessels and nerves of the upper limb

Myotonic dystrophy

Superficial structures of the neck: Anterior triangle

Iliotibial band syndrome

Neurocutaneous disorders: Pathology review

Bones of the lower limb

Bones of the upper limb

Anatomy of the anterior and medial thigh

Necrotizing fasciitis

Skin cancer: Clinical

Bone tumors: Pathology review

Neuromuscular junction disorders: Pathology review

Legg-Calve-Perthes disease

Pediatric orthopedic conditions: Clinical

Restless legs syndrome

Anatomy of the leg

Osgood-Schlatter disease (traction apophysitis)

Developmental dysplasia of the hip

Anatomy of the hip joint

Anatomy of the orbit

Patellofemoral pain syndrome

Anatomy of the elbow joint

Joints of the ankle and foot

Lower back pain: Clinical

Osteoporosis medications

Back pain: Pathology review

Lordosis, kyphosis, and scoliosis

Osteomalacia and rickets

Paget disease of bone

Acute tubular necrosis

Bones of the cranium

Bones of the neck

Pediatric bone tumors: Clinical

Bone remodeling and repair

Seronegative arthritis: Clinical

Seronegative and septic arthritis: Pathology review

Reactive arthritis

Juvenile idiopathic arthritis

Joint pain: Clinical

Gout and pseudogout: Pathology review

Non-steroidal anti-inflammatory drugs

Sjogren syndrome: Clinical

Sjogren syndrome

Sjogren syndrome: Pathology review

Pediatric bone and joint infections: Clinical

Pasteurella multocida

Bites and stings: Clinical

Cauda equina syndrome

Systemic lupus erythematosus (SLE): Clinical

Skin and soft tissue infections: Clinical

Antiphospholipid syndrome

Systemic lupus erythematosus (SLE): Pathology review

Myasthenia gravis

Lambert-Eaton myasthenic syndrome

Raynaud phenomenon

Cholinomimetics: Indirect agonists (anticholinesterases)

Scleroderma: Pathology review

Skin cancer: Pathology review

Hypersensitivity skin reactions: Clinical

Hair, skin and nails

Acneiform skin disorders: Pathology review

Benign hyperpigmented skin lesions: Clinical

Pigmentation skin disorders: Pathology review

Blistering skin disorders: Clinical

Papulosquamous and inflammatory skin disorders: Pathology review

Vesiculobullous and desquamating skin disorders: Pathology review

Eczematous rashes: Clinical

Body focused repetitive disorders

Seborrhoeic dermatitis

Malassezia (Tinea versicolor and Seborrhoeic dermatitis)

Atopic dermatitis

Contact dermatitis

Papulosquamous skin disorders: Clinical

Hypokinetic movement disorders: Clinical

Movement disorders: Pathology review

Actinic keratosis

Hypopigmentation skin disorders: Clinical

Human herpesvirus 8 (Kaposi sarcoma)

Bartonella henselae (Cat-scratch disease and Bacillary angiomatosis)

Orbital cellulitis

Periorbital cellulitis

Periapical lesions

Staphylococcus aureus

Herpesvirus medications

Herpes simplex virus

Poxvirus (Smallpox and Molluscum contagiosum)

Varicella zoster virus

Epstein-Barr virus (Infectious mononucleosis)

Autoimmune bullous skin disorders: Clinical

Pityriasis rosea

Burns: Clinical

Acetaminophen (Paracetamol)

Paracetamol toxicity

Bronchodilators: Leukotriene antagonists and methylxanthines

Cholinomimetics: Direct agonists

Skeletal muscle histology

Mechanisms of antibiotic resistance

Cell wall synthesis inhibitors: Penicillins

Cell wall synthesis inhibitors: Cephalosporins

DNA synthesis inhibitors: Fluoroquinolones

Miscellaneous protein synthesis inhibitors

Protein synthesis inhibitors: Tetracyclines

Miscellaneous cell wall synthesis inhibitors

Antituberculosis medications

Antimetabolites: Sulfonamides and trimethoprim

Protein synthesis inhibitors: Aminoglycosides

Integrase and entry inhibitors

Nucleoside reverse transcriptase inhibitors (NRTIs)

Protease inhibitors

Hepatitis medications

Non-nucleoside reverse transcriptase inhibitors (NNRTIs)

Neuraminidase inhibitors

Miscellaneous antifungal medications

Anthelmintic medications

Anti-mite and louse medications

Key Takeaways

An unhappy triad, also known as O'Donoghue's triad, is a common injury that occurs in the knee joint. It involves damage to the anterior cruciate ligament (ACL), medial collateral ligament (MCL), and medial meniscus. The injury usually occurs as a result of a sudden forceful twist or impact on the knee joint, such as during a sports activity. The lateral meniscus may also be involved in some cases. This injury is typically treated with surgery and physical therapy.