Patrick J. McMahon MD


Patellar Dislocation

The kneecap (patella) is normally positioned over the front of the knee joint at the base of the thighbone (femur). A kneecap can be dislocated, or moved out of its normal position, when: The inner edge of the kneecap is hit, pushing it toward the outer side of the leg. This can happen more easily if there is patellar…

Meniscus Tear: Should I Have Surgery?

Guides you through the decision to have surgery for a torn meniscus. Explains two kinds of surgery. Explains when surgery is done. Lists risks and benefits of surgery for meniscus tear. Includes interactive tool to help you decide.

Type II Shoulder Separation

A shoulder separation is the partial or complete separation of two parts of the shoulder: the collarbone (clavicle) and the end (acromion) of the shoulder blade (scapula). In a type II shoulder separation, the acromioclavicular (AC) ligament is completely torn, and the coracoclavicular (CC) ligament is either partially…

Frozen Shoulder

What is frozen shoulder? Frozen shoulder (adhesive capsulitis) is stiffness, pain, and limited range of movement in your shoulder . It may happen after an injury or overuse or from a disease such as diabetes or a stroke. The tissues around the joint stiffen, scar tissue forms, and shoulder movements become difficult and…