Michael C. Schubert

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BACKGROUND Balance dysfunction can be debilitating and can lead to catastrophic outcomes such as falls. The inner ear vestibular system is an important contributor to balance control. However, to our knowledge, the prevalence of vestibular dysfunction in the United States and the magnitude of the increased risk of falling associated with vestibular(More)
OBJECTIVE To determine whether the cervico-ocular reflex contributes to gaze stability in patients with unilateral vestibular hypofunction. STUDY DESIGN Prospective study. SETTING Tertiary referral center. PATIENTS Patients with unilateral vestibular hypofunction (n = 3) before and after vestibular rehabilitation and healthy subjects (n = 7). (More)
OBJECTIVE This study was designed to measure visual acuity during active vertical head movement and to examine its relationship to subjective reports of oscillopsia. STUDY DESIGN This was a prospective, clinical study. SETTING The study was performed in a tertiary, ambulatory referral center. PATIENTS Thirty normal subjects, 13 patients with(More)
STUDY DESIGN A prospective, cohort evaluation of 262 consecutive patients who underwent transforaminal endoscopic excision for recurrent lumbar disc herniation, after previous discectomy. OBJECTIVE To review complications and results of the endoscopic transforaminal discectomy (ETD) for recurrent herniated disc with a 2-year follow-up. SUMMARY OF(More)
OBJECTIVE To determine the effect of vestibular exercises on the recovery of visual acuity during head movement in patients with unilateral vestibular hypofunction. STUDY DESIGN Prospective, randomized, double-blind study. SETTING Ambulatory referral center. PATIENTS Twenty-one patients with unilateral vestibular hypofunction, aged 20 to 86 years. (More)
OBJECTIVE To determine to what extent patients with vestibular hypofunction experience falls. STUDY DESIGN Prospective clinical study. SETTING Outpatient tertiary care facility in a university. PATIENTS Patients with unilateral (n = 70) and bilateral (n = 45) vestibular hypofunction, confirmed on vestibular function testing, aged 24 to 89 years. (More)
OBJECTIVE To determine the effect of vestibular exercises on the recovery of visual acuity during head movement in patients with bilateral vestibular hypofunction (BVH). DESIGN Prospective, randomized, double-blinded study. SETTING Outpatient clinic, academic setting. PATIENTS Thirteen patients with BVH, aged 47 to 73 years. INTERVENTION One group(More)
OBJECTIVE To determine why dynamic visual acuity (DVA) improves after vestibular rehabilitation in people with vestibular hypofunction. DESIGN Combined descriptive and intervention study. SETTING Outpatient department in an academic medical institution. PARTICIPANTS Five patients (age, 42-66 y) and 4 age-matched controls (age, 39-67 y) were studied.(More)
The vestibular system detects motion of the head and maintains stability of images on the fovea of the retina as well as postural control during head motion. Signals representing angular and translational motion of the head as well as the tilt of the head relative to gravity are transduced by the vestibular end organs in the inner ear. This sensory(More)
STUDY DESIGN A prospective randomized study involving 280 consecutive cases of lumbar disc herniation managed either by an endoscopic discectomy alone or an endoscopic discectomy combined with an intradiscal injection of a low dose (1000 U) of chymopapain. OBJECTIVE To compare outcome, complications, and reherniations of both techniques. SUMMARY OF(More)