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Direct infections of joint
Direct infections of joint (ICD-11 FA10, Japanese 関節の直接感染) is a classification category for hematogenic or non-hematogenic joint infections, with child codes for bacterial, viral, and fungal joint infection, excluding reactive and postinfectious arthropathies.
Discitis
Infection of intervertebral disc (discitis, spondylodiscitis, ICD-11 FA91), usually Staphylococcus aureus; hematogenous or postprocedural; diagnosed by MRI; treated with prolonged antibiotics and sometimes surgery.
Discoid lupus erythematosus
Discoid lupus erythematosus (DLE, chronic cutaneous lupus) is a scarring autoimmune skin disease of the face and scalp; 22 to 30 percent of patients progress to systemic lupus erythematosus, with ANA titers of 1:320 or higher a key risk factor.
Discoid meniscus
Discoid meniscus: congenital abnormally thick, disc-shaped knee meniscus, mostly lateral, in 3-5% of Western and 10-15% of Asian populations; Watanabe types I-III; treated by saucerization.
Discrete papular lichen myxedematosus
Discrete papular lichen myxedematosus is a rare, chronic skin condition with small, symmetrical, flesh-colored mucinous papules on the limbs and trunk, without paraproteinemia or thyroid disease.
Disease activity measures and treat-to-target in rheumatoid arthritis
Disease activity measures in rheumatoid arthritis, including DAS28, CDAI, SDAI, and Boolean criteria, guide treat-to-target: adjusting therapy until remission or low disease activity is reached.
Disease-modifying antirheumatic drug
Disease-modifying antirheumatic drugs (DMARDs), including methotrexate, leflunomide, sulfasalazine, hydroxychloroquine, biologics, and JAK inhibitors, slow rheumatoid arthritis progression; methotrexate is the anchor csDMARD.
Diseases of jaws
Diseases of jaws (ICD-11 DA06; ICD-10 K10) are conditions of the maxilla and mandible not classified elsewhere: inflammatory bone disease, alveolitis, exostosis, Stafne cavity, plus jaw cysts, osteonecrosis, and tumors.
Dislocated shoulder
Dislocated shoulder: the humeral head separates from the glenoid socket, anterior in over 95% of cases. Treated by closed reduction, sling, and rehabilitation; surgery lowers recurrence in young patients.
Dislocation of acromioclavicular joint
Acromioclavicular joint dislocation, also called AC separation or shoulder separation, is a traumatic disruption of the clavicle-acromion joint graded by the Rockwood I–VI system; types I–II are treated nonoperatively, IV–VI surgically, and trial evidence shows comparable long-term function for surgery versus conservative care in types III–V.
Dislocation of ankle joint
Dislocation of the ankle joint is the complete displacement of the talus from the tibia and fibula; most cases involve a fracture, and pure dislocations are rare.
Dislocation of cervical vertebra
Dislocation of cervical vertebra (ICD-11 NA23.1): traumatic loss of normal articulation between cervical vertebrae, including facet, atlanto-axial, and cranio-cervical dislocation; diagnosed by CT, treated by traction or surgical fusion.
Dislocation of distal radioulnar joint
Dislocation of the distal radioulnar joint (DRUJ, ICD-11 NC54.00) is traumatic displacement of the ulnar head from the radius' sigmoid notch; dorsal or volar, often missed, treated by closed reduction and 6-week immobilization.
Dislocation of elbow
Dislocation of the elbow: separation of the humerus, ulna, and radius joint surfaces, second most common dislocation after the shoulder. Simple (ligament-only) versus complex (fracture) types; early mobilization after reduction is standard treatment.
Dislocation of finger
Dislocation of finger: displacement of finger phalanges at DIP, PIP, or MCP joints, ICD-11 NC54.2. Most occur at the PIP joint, usually dorsal from hyperextension; treated by closed reduction, splinting, or buddy taping.
Dislocation of great toe
Dislocation of great toe (hallux), ICD-11 ND14.1: traumatic MTP or IP joint dislocation. MTP form follows hyperextension (turf toe spectrum, Jahss types); rare IP form involves sesamoid incarceration (Miki types), often needing open reduction.
Dislocation of hip
Dislocation of hip: femoral head forced out of the acetabulum, usually posterior after high-energy trauma. Emergent reduction within 6 hours limits avascular necrosis; sciatic nerve injury affects about 10% of adults.
Dislocation of knee
Knee dislocation (tibiofemoral dislocation): limb-threatening multiligament knee injury disrupting at least one cruciate ligament, classified by Kennedy position or Schenck KD I–V grades, with popliteal artery and nerve injury risk.
Dislocation of patella
Dislocation of patella (patellar dislocation): the kneecap fully leaves the femoral trochlear groove, almost always laterally, after a twisting injury in young active people; treated by reduction, bracing, and physiotherapy, with up to 40% recurrence.
Dislocation of radial head
Dislocation of radial head (ICD-11 NC33.0): displacement of the radius from the capitellum. Common as nursemaid's elbow subluxation in children; complete dislocation is rare, linked to Monteggia fractures or congenital anomaly (0.06-0.16% incidence).
Dislocation of radiocarpal joint
Dislocation of radiocarpal joint (radiocarpal dislocation, RCD, ICD-11 NC54.01): rare traumatic total loss of contact between carpus and distal radius, 0.2-2.7% of wrist injuries, usually dorsal, high-energy, with radial styloid and ligamentous injuries.
Dislocation of scapula
Dislocation of scapula (ICD-11 NC13.3; ICD-10-CM S43.31), also called scapular dislocation or locked scapula, a rare traumatic scapulothoracic injury, extrathoracic or intrathoracic, usually reducing with sedation or muscle relaxants.
Dislocation of sternoclavicular joint
Sternoclavicular joint dislocation: rare (1% of all dislocations) separation of clavicle from sternum, anterior (9x more common) or posterior; posterior type risks life-threatening mediastinal compression and needs urgent reduction, CT is the imaging of choice.
Dislocation of tarsometatarsal joint
Dislocation of the tarsometatarsal joint (Lisfranc dislocation), midfoot disruption from axial or twisting load on a plantarflexed foot; unstable cases need ORIF or arthrodesis, stable ones nonoperative care.
Dislocation of thumb
Dislocation of thumb, including thumb CMC (basal joint) dislocation, MCP, and IP dislocations. Rare CMC dislocation (<1% of hand lesions); treated by closed reduction with 4-6 week spica casting or ligament reconstruction, often FCR autograft.
Dislocation of wrist
Dislocation of wrist (ICD-11 NC54.0; ICD-10 S63.0): displacement of one or more wrist bones, including distal radioulnar, radiocarpal, midcarpal, and perilunate or lunate dislocations; rare, often missed, requiring urgent reduction.
Disorder of ligament
Disorder of ligament (ICD-11 FA34.1) covers non-acute abnormal ligament conditions such as sprains and laxity, under FA34 joint derangements; acute injuries are coded separately in chapter 22.
Dissecting cellulitis of the scalp
Dissecting cellulitis of the scalp (perifolliculitis capitis abscedens et suffodiens, Hoffman's disease) is a chronic inflammatory follicular occlusion disorder causing painful scalp nodules, sinus tracts, and scarring alopecia, mainly in African American men aged 20-40.
Distal anoctaminopathy
Distal anoctaminopathy (Miyoshi muscular dystrophy 3, MMD3) is a rare autosomal recessive distal myopathy from biallelic ANO5 mutations, with adult-onset asymmetric calf weakness, very high creatine kinase, and slow progression.
Distal arthrogryposis type 1
Distal arthrogryposis type 1 (DA1, digitotalar dysmorphism, AMCD1): autosomal dominant congenital contractures of hands and feet (camptodactyly, overlapping fingers, clubfoot) caused by TPM2, MYBPC1, TNNI2, TNNT3, or MYH3 mutations.