![]() The hypothesis was that such activities could be deleterious for shoulders if not performed with precaution. The aim of this study was to analyze the occurrence of rotator cuff impingement during complex shoulder motion using an in vivo technique combining optical motion capture and magnetic resonance imaging (MRI) to determine safety sexual activities for men. Fortunately, the authors previously developed and validated in different studies all the necessary tools to perform such challenging simulation. This requires accurate 3D reconstruction of the shoulder bones, kinematics estimation of the joint during complex shoulder motion and evaluation of impingement using the subject-specific 3D models and kinematics. Simulating dynamically subacromial impingements during activities of daily living is challenging. This issue remaining rarely discussed and very limited objective data being available to propose recommendations, they felt the necessity to fill this gap. To rule out a ‘worst case scenario’, the authors investigated if the latter activity was also associated with rotator cuff overload in order to promote, if required, adequate injury prevention. However, no such association has been established with shoulder injuries yet. Sexual activity is another known factor of emotional happiness. Indeed, it has been proved that almost all enjoyable activities (i.e., sports, good food associated to hypercholesterolemia, alcohol or tobacco ) are deleterious for the rotator cuff. The authors of the present study have noted other alarming risk factors in recent publications that may impede with general quality of life. Their aetiologies in non-traumatic situations are controversial, with two main theories described: an extrinsic mechanism, also called subacromial impingement, where symptoms are caused by compression of the rotator cuff, and an intrinsic one, where symptoms are thought to result from overload on degenerating rotator cuff tendons. Tears of the rotator cuff are a frequent and a well-known cause of chronic pain and dysfunction in the shoulder. The present findings may assist health professionals in providing them with preventive measures and is highly relevant for decision-making regarding health promoting initiatives. Such high-tech investigation shows promise in the areas of cause, intervention and education. This study indicates that some sexual positions could potentially place the rotator cuff at risk. No subacromial impingement was however observed during passive sexual activities (e.g., basset hound). All active sexual positions requiring important pressure on the hands or elbows (e.g., scorpio) or weight lifting (e.g., superman) caused subacromial impingement. ![]() ![]() Significant differences in subacromial space height were observed between the different performed actions. Five common active and passive sexual positions were evaluated. ![]() A volunteer couple underwent Magnetic Resonance Imaging (MRI) and motion capture of their shoulders. To use a patient-specific 3D measurement technique coupling medical imaging and optical motion capture to evaluate the safety of various sexual positions according to subacromial compression. The hypothesis was that such activities could be deleterious if not performed with precaution. The aim of this study was to analyze the occurrence of rotator cuff impingement due to reduction of subacromial space height during complex shoulder motion to determine safety of sexual activities. ![]()
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