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  2. Joint locking (medicine) - Wikipedia

    en.wikipedia.org/wiki/Joint_locking_(medicine)

    Complaints of locking sensation in the knee joint can be divided into true locking and pseudo locking. True locking happens when the intra-articular structure (e.g. ligaments) [1] is damaged, or a loose body is present inside the joint, or there is a meniscal tear. The knee can be unlocked by rotating the leg and full movement can be restored.

  3. Periodic limb movement disorder - Wikipedia

    en.wikipedia.org/wiki/Periodic_limb_movement...

    PLMD is characterized by increased periodic limb movements during sleep, which must coexist with a sleep disturbance or other functional impairment, in an explicit cause-effect relationship. [ 3 ] [ 4 ] Usually, these involuntary movements come from lower extremities (including toes, ankles, knees, and hips), although they can also be observed ...

  4. Hypnic jerk - Wikipedia

    en.wikipedia.org/wiki/Hypnic_jerk

    As a consequence, it causes a jerk to wake the sleeper up so they can catch themselves. [11] A researcher at the University of Colorado suggested that a hypnic jerk could be "an archaic reflex to the brain's misinterpretation of muscle relaxation with the onset of sleep as a signal that a sleeping primate is falling out of a tree.

  5. Knee pain when walking can have many potential causes, including injuries, aging, and medical conditions. The type of pain you feel may help treat it. Knee Pain When Walking: Potential Causes and ...

  6. Patellofemoral pain syndrome - Wikipedia

    en.wikipedia.org/wiki/Patellofemoral_pain_syndrome

    The pain is generally in the front of the knee and comes on gradually. [2] [4] Pain may worsen with sitting down with a bent knee for long periods of time, excessive use, or climbing and descending stairs. [1] [5] While the exact cause is unclear, it is believed to be due to overuse.

  7. Spontaneous osteonecrosis of the knee - Wikipedia

    en.wikipedia.org/wiki/Spontaneous_osteonecrosis...

    The condition is usually characterized by a sudden onset of knee pain, worse at night, or during weight-bearing such as standing or running. Nevertheless, it can also occur during rest or without any weight-bearing. About 94% of the cases affect the medial condyle of the femur. This is because the blood supply for the medial condyle is less ...

  8. Myoclonus - Wikipedia

    en.wikipedia.org/wiki/Myoclonus

    The contractions are very rapid, occurring as often as 150 times a minute, and may persist during sleep. The condition usually appears in adults and can last indefinitely. People with palatal myoclonus usually regard it as a minor problem; some complain of an occasional "clicking" sound, a noise made as the soft palate muscles contract.

  9. Restless legs syndrome - Wikipedia

    en.wikipedia.org/wiki/Restless_legs_syndrome

    "Restless legs feel similar to the urge to yawn, situated in the legs or arms." These symptoms of RLS can make sleeping difficult for many patients and a 2005 National Sleep Foundation poll [25] shows the presence of significant daytime difficulties resulting from this condition. These problems range from being late for work to missing work or ...

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