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Takao Yamamuro - One of the best experts on this subject based on the ideXlab platform.

  • The Infraspinatus test: An early diagnostic sign of Muscle weakness during external rotation of the shoulder in athletes.
    Journal of shoulder and elbow surgery, 1993
    Co-Authors: Hiromichi Hama, Toshihiro Morinaga, Kohzo Suzuki, Hiroshi Kuroki, Masami Sunami, Takao Yamamuro
    Abstract:

    Fifty-two men successively elevated dumbbells in increments of 0.5 kg from 1 to 9 kg, performing external rotation of the shoulder with the elbow at 90° of flexion and the forearm at neutral rotation, while lying in the lateral position. Mean values and standard deviations of maximum weight elevated above the horizontal level by the dominant and nondominant arms of 49 men, excluding three athletes with marked Infraspinatus Muscle atrophy, ranged from 6.2 ± 1.12 kg to 6.7 ± 1.11 kg. Considering the contribution of the Infraspinatus Muscle to the strength of shoulder external rotation, the elevation of a 3 kg dumbbell, called the "Infraspinatus test," is considered to be an early diagnostic sign of Muscle weakness during external rotation of the shoulder in athletes who have insidious Infraspinatus Muscle atrophy.

  • A new strategy for treatment of suprascapular entrapment neuropathy in athletes: Shaving of the base of the scapular spine.
    Journal of shoulder and elbow surgery, 1992
    Co-Authors: Hiromichi Hama, Toshihiro Morinaga, Hiroshi Kuroki, Yasuo Ueba, Kozo Suzuki, Takao Yamamuro
    Abstract:

    A study of three volleyball teams comprising 40 players demonstrated the frequent occurrence of Infraspinatus Muscle atrophy. Anatomic studies of the suprascapular nerve in 20 cadavers revealed the possibility of entrapment of the nerve at the spinoglenoid notch. Four athletes with suprascapular neuropathy were followed up after surgical treatment. Shaving of the lateral edge of the base of the scapular spine proved effective. However, it is suggested that preventive measures such as strengthening of the Infraspinatus Muscle are important because suprascapular neuropathy in athletes is combined to at least some degree with damage to the Muscle itself.

James Ilic - One of the best experts on this subject based on the ideXlab platform.

  • suprascapular nerve rotator cuff compression syndrome in volleyball players
    Journal of Shoulder and Elbow Surgery, 1998
    Co-Authors: Michael J Sandow, James Ilic
    Abstract:

    Selective denervation of the Infraspinatus Muscle producing weakness and wasting has been reported in certain sports (eg, volleyball and baseball). Nerve kinking or friction caused by excessive Infraspinatus motion and compression by superior or inferior transverse scapular ligament or ganglions have been proposed as possible causes. However, in extreme abduction with full external rotation of the shoulder, the medial tendinous margin between the Infraspinatus and supraspinatus Muscles impinges strongly against the lateral edge of scapular spine, compressing the intervening Infraspinatus branch of the suprascapular nerve. Spinaglenoid notchplasty has been performed in 5 elite volleyball players with Infraspinatus neuropathy, allowing recovery of shoulder function in all patients and correction of Infraspinatus Muscle wasting. All returned to the same or higher level of volleyball by 8 months after surgery. An alternative cause of Infraspinatus compromise in volleyball players is proposed and has been treated surgically with satisfactory outcome.

Marc Walravens - One of the best experts on this subject based on the ideXlab platform.

  • Suprascapular neuropathy in volleyball players
    British journal of sports medicine, 2000
    Co-Authors: E. Witvrouw, Ann Cools, Roeland Lysens, Dirk Cambier, Guy Vanderstraeten, Jan Victor, Claire Sneyers, Marc Walravens
    Abstract:

    Background—Suprascapular nerve entrapment with isolated paralysis of the Infraspinatus Muscle is uncommon. However, this pathology has been reported in volleyball players. Despite a lack of scientific evidence, excessive strain on the nerve is often cited as a possible cause of this syndrome. Previous research has shown a close association between shoulder range of motion and strain on the suprascapular nerve. No clinical studies have so far been designed to examine the association between excessive shoulder mobility and the presence of this pathology. Aim—To study the possible association between the range of motion of the shoulder joint and the presence of suprascapular neuropathy by clinically examining the Belgian male volleyball team with respect to several parameters. Methods—An electromyographic investigation, a clinical shoulder examination, shoulder range of motion measurements, and an isokinetic concentric peak torque shoulder internal/external rotation strength test were performed in 16 professional players. Results—The electrodiagnostic study showed a severe suprascapular neuropathy in four players which aVected only the Infraspinatus Muscle. In each of these four players, suprascapular nerve entrapment was present on the dominant side. Except for the hypotrophy of the Infraspinatus Muscle, no significant diVerences between the aVected and non-aVected players were observed on clinical examination. Significant diVerences between the aVected and non-aVected players were found for range of motion measurements of external rotation,horizontal flexion and forward flexion, and for flexion of the shoulder girdle (protraction); all were found to be higher in the aVected players than the non-aVected players. Conclusions—This study suggests an association between increased range of motion of the shoulder joint and the presence of isolated paralysis of the Infraspinatus Muscle in volleyball players. However, the small number of patients in this study prevents definite conclusions from being drawn. (Br J Sports Med 2000;34:174‐180)

Bernhard Jost - One of the best experts on this subject based on the ideXlab platform.

  • electromyography and nerve conduction velocity for the evaluation of the Infraspinatus Muscle and the suprascapular nerve in professional beach volleyball players
    American Journal of Sports Medicine, 2012
    Co-Authors: Georg Lajtai, Gernot Aitzetmüller, Karl Wieser, Michael Ofner, Gustav Raimann, Bernhard Jost
    Abstract:

    Background:Beach volleyball is an overhead sport with a high prevalence of Infraspinatus Muscle atrophy of the hitting shoulder.Hypothesis:Infraspinatus Muscle atrophy seems to be caused by a repetitive traction injury of the suprascapular nerve. Early pathological findings might be assessed with surface electromyography (EMG) and nerve conduction velocity (NCV) measurements.Study Design:Cross-sectional study; Level of evidence, 3.Methods:Fully competitive professional beach volleyball players were assessed with a structured interview, shoulder examination, strength measurements (external rotation and elevation), and neurophysiological examination (surface EMG and NCV of the Infraspinatus and supraspinatus Muscles and the suprascapular nerve, respectively) during the Beach Volleyball Grand Slam tournament 2010 in Klagenfurt, Austria.Results:Thirty-five men with an average age of 28 years were examined. Visible Infraspinatus atrophy was found in 12 players (34%), of which 8 (23%) had slight atrophy and 4 (...

  • The Shoulders of Professional Beach Volleyball Players High Prevalence of Infraspinatus Muscle Atrophy
    The American journal of sports medicine, 2009
    Co-Authors: Georg Lajtai, Christian W. A. Pfirrmann, Gernot Aitzetmüller, Christof Pirkl, Christian Gerber, Bernhard Jost
    Abstract:

    BackgroundBeach volleyball is an Olympic overhead sport. It is not well known which clinical and imaging findings are normal and which are associated with symptoms.HypothesisThere are typical clinical and imaging findings in the hitting shoulders of fully competitive professional beach volleyball players, as compared with their nonhitting shoulders.Study DesignCross-sectional study; Level of evidence, 3.MethodsDuring the Beach Volleyball Grand Slam Tournament in Klagenfurt, Austria, 84 professional players (54 men, 30 women) underwent a questionnaire-based interview and a complete physical examination, including scoring and sonography of both shoulders. Twenty-nine players had shoulder MRIs.ResultsThe mean age of the athletes was 28 years. Atrophy of the Infraspinatus Muscle was found in 30% of the hitting shoulders, and it was not typically recognized by the players. The absolute Constant score was significantly lower in the hitting shoulder (87 versus 93 points, P < .0001). Average external rotation str...

S. Colonna - One of the best experts on this subject based on the ideXlab platform.