Total Shoulder Replacement

Like all joints in the body, the shoulder is formed by 2 bones, the cup (glenoid) and ball (humerus). The surfaces of the ends of these bones is covered a smooth, pearly white layer hard fibrous tissue called cartilage that acts as both a shock absorber and helps the 2 bones glide smoothly over one another. As the shoulder joint ages, this cartilage can become damaged or worn down, leading to osteoarthritis of the joint. The cartilage surface may become rough and irregular, or may wear completely down to the bone. This usually leads to the development of pain and bone spurs as the body tries to compensate for the loss of cartilage. Additionally, the loss of joint space can change how the shoulder functions and force other muscles to compensate for the altered joint kinematics. Unfortunately, the body only produces a finite number of cartilage-producing cells, and even the most recent advances in medicine have yet to find efficient mechanisms for regrowing the lost cartilage. In cases of advanced wear, a total shoulder replacement can greatly reduce symptoms.

An arthritic glenohumeral joint

One very viable option to restore normal joint mechanics and relieve pain is a total shoulder replacement or total shoulder arthroplasty (TSA). When performed properly, a TSA can relieve pain by removing the arthritic joint surfaces and replacing them with metal and plastic, returning the bones of your shoulder to their normal anatomic position. A perfect shoulder replacement is very difficult to perform since every shoulder is different and may require different components.

A diagram showing the current Walch classification system for glenoid wear. Each letter specifies a particular wear pattern or shape of the glenoid, while a higher number indicates more advanced arthritic change.

To optimize results, we utilize highly specific imaging in the form of a specialized CT scan designed to give the most detailed image of your shoulder anatomy in regards to arthritic changes. These images can then be uploaded to a specialized computer program that allows digital implantation of a vast array of different components. This allows every TSA to be specifically tailored to each patient and ensures a fully functioning, pain free shoulder. These scans require a specialized protocol to be used by the technician performing the scan. Unfortunately, these protocols are currently limited to only a few imaging centers in Tennessee, but our staff can help you find a convenient location in Knoxville if the time comes!

3 types of arthroplasties used depending on bone quality, glenoid shape and wear pattern.

Prior to surgery, patients will be sent for their CT scan and any pre-admission testing that may be required. Patients usually stay overnight after surgery, but if your shoulder replacement is done early in the morning you may be able to return home the same evening. For the operation, an incision is made from just above your armpit to a few inches down your arm. During surgery, the top part of the humerus is cut off and a specialized implant is fitted for your shoulder. Then, the glenoid is careful reamed down to a uniform surface before a cutting-edge polyethylene cup is implanted into several small holes drilled in the bone. This cup is made of a special type of polyethylene that is infused with Vitamin E during manufacturing. This has been shown to greatly improve the strength and lifespan of the plastic, with some wear simulators showing lifespans of up to 20-25 years.

Stemless Total Shoulder Replacement

A SIMPLICITI stemless total shoulder arthroplasty system designed and used by Dr. Edwin Spencer.
Surgical procedure animation of the Simpliciti Total Shoulder system designed by Dr. Edwin Spencer

The components used in each arthroplasty at the Shoulder and Elbow Center are hand-selected by Dr. Edwin Spencer. Not only has Dr. Spencer performed over 3000 shoulder arthroplasties, he has designed many of the components that he uses, including a revolutionary stemless humeral implant as well as a specialized cup designed to reduce specific wear patterns seen in males (known as a Posterior Augmented Glenoid or PAG). While many surgeons may use an entire set of components from the same manufacturer, Dr. Spencer combines over 15 years of experience with the latest advancements in CT imaging and computer-aided design software to determine the best combination of components that will provide the best long-term results, leaving patients with a pain-free, well functioning shoulder for years to come. For a full video of an anatomic shoulder replacement using the new DJO EDGE System or the older Simpliciti Shoulder System, both designed by Dr. Edwin Spencer, see one of the videos below.

As one of the top shoulder surgeons in Tennessee, Dr. Spencer is highly specialized in these types of surgeries. If you believe you may be in need of our services, don’t hesitate to submit an appointment request on our Homepage and get set up at one of our Knoxville clinics.


Dr. Spencer performing a total shoulder arthroplasty using the new CS EDGE TSA System by DJO Global. ***WARNING- GRAPHIC CONTENT***

Dr. Spencer performing a total shoulder arthroplasty using a Simpliciti Stemless humeral component and posterior-augmented glenoid component ***WARNING- GRAPHIC CONTENT***

The Shoulder and Elbow Center is proud to support the 2019 WBSC Senior World Cup 70 AAA Champions- congrats on the title guys!

Research and Patient Education

Simpliciti Total Shoulder Replacement Educational Materials