Impact of Reverse Shoulder Arthroplasty Design and Patient Shoulder Size on Moment Arms and Muscle Fiber Lengths in Shoulder Abductors
Reverse shoulder arthroplasty (RSA) increases the moment arm of the deltoid, however there is limited knowledge on the accompanying changes in muscle architecture that play a role in muscle force production. The purpose of our study is to use a geometric shoulder model to evaluate the anterior deltoid, middle deltoid, and supraspinatus regarding 1) differences in moment arms and muscle-tendon lengths in small, medium, and large native shoulders, and 2) impact of three RSA designs on moment arms, muscle fiber lengths, and force-length (F-L) curves.
What Causes Neck and Shoulder Pain?
The neck and shoulders are complex and interconnected areas, and medical problems that affect one often affect the other, as well. Pain and dysfunction from injuries or conditions that impact the joints, muscles, and other structures can easily spread from the neck to the shoulder(s) and from the shoulder(s) to the neck.
Study of Former NFL Players Shows Race Differences in Chronic Pain
The study, of nearly 4,000 former National Football League (NFL) players, found that Black men reported more intense, more debilitating pain than their white counterparts. They were also more likely to suffer from depression, anxiety or fatigue -- and those problems were often related to their pain levels.
Tennis Elbow: Symptoms, Causes, and Treatment
Tennis elbow (lateral epicondylitis) is swelling, inflammation, and subsequent tearing of the tendons in your forearm.These tissues, which attach muscle to bone, can become overtaxed with repetitive use, causing an aching or burning pain that gets worse when you grip or lift something.
Marijuana Users More Prone to Infections After Knee, Shoulder Surgeries
Surgeons have long advised patients to stop smoking cigarettes for several weeks before their operations to lower the risk of complications. But what about weed? New research has found reason for worry: Marijuana users had higher infection rates after minimally invasive knee and shoulder procedures.
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