Unhappy triad
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Summary of Unhappy triad
An unhappy triad refers to a complete or partial tear of the anterior cruciate ligament, medial collateral ligament, and the medial meniscus. The lateral meniscus may also be involved.
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Musculoskeletal system
Pathology
Pediatric musculoskeletal conditions
Musculoskeletal injuries and trauma
Rotator cuff tear
Dislocated shoulder
Radial head subluxation (Nursemaid elbow)
Winged scapula
Thoracic outlet syndrome
Carpal tunnel syndrome
Ulnar claw
Erb-Duchenne palsy
Klumpke paralysis
Iliotibial band syndrome
Unhappy triad
Anterior cruciate ligament injury
Patellar tendon rupture
Meniscus tear
Patellofemoral pain syndrome
Sprained ankle
Achilles tendon rupture
Spondylolysis
Spondylolisthesis
Degenerative disc disease
Spinal disc herniation
Sciatica
Compartment syndrome
Rhabdomyolysis
Bone disorders
Osteogenesis imperfecta
Craniosynostosis
Pectus excavatum
Arthrogryposis
Genu valgum
Genu varum
Pigeon toe
Flat feet
Club foot
Cleidocranial dysplasia
Achondroplasia
Osteomyelitis
Bone tumors
Osteochondroma
Chondrosarcoma
Osteoporosis
Osteomalacia and rickets
Osteopetrosis
Paget disease of bone
Osteosclerosis
Lordosis, kyphosis, and scoliosis
Joint disorders
Muscular disorders
Neuromuscular junction disorders
Other autoimmune disorders
Musculoskeletal system pathology review
Back pain: Pathology review
Rheumatoid arthritis and osteoarthritis: Pathology review
Seronegative and septic arthritis: Pathology review
Gout and pseudogout: Pathology review
Systemic lupus erythematosus (SLE): Pathology review
Scleroderma: Pathology review
Sjogren syndrome: Pathology review
Bone disorders: Pathology review
Bone tumors: Pathology review
Myalgias and myositis: Pathology review
Neuromuscular junction disorders: Pathology review
Muscular dystrophies and mitochondrial myopathies: Pathology review
Pediatric musculoskeletal disorders: Pathology review
AssessmentsUnhappy triad
Unhappy triad
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Flashcards
Unhappy triad
5 flashcards
Questions
USMLE® Step 1 style questions USMLE
1 questions
USMLE® Step 2 style questions USMLE
1 questions
Preview
A 17-year-old male comes to the emergency department because of severe left knee pain for an hour. He was playing football when an opposing player hit the lateral aspect of his knee. He was unable to finish the game because of pain, and he feels instability in his knee. Examination of the knee shows a large effusion. There is tenderness along the medial joint line, and Lachman test is positive. Which of the following structures were most likely damaged?
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Unhappy triad exam links
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