Spine Surgeries

Dr. Keenen and Dr. Hiratzka are orthopedic spine surgeons in Portland, OR specializing in minimally invasive surgery techniques. As a board-certified and fellowship-trained spine surgeon, he treats all relevant spinal conditions of the neck and low back. Dr. Keenen and Dr. Hiratzka have a commitment to providing accurate diagnoses and effective surgical treatments that bring back functionality to patients who were previously suffering from pain.

Where Our Surgeries are Performed

Spine surgeries are performed by Dr. Keenen and Dr. Hiratzka at the following hospital locations:

Dr. Keenen and Dr. Hiratzka also performs surgery at the South Portland Outpatient Surgical Center. Lastly, Dr. Keenen implemented the first JCAH-certified spine center in Oregon.

Surgeries Offered at Pacific Spine

orthopedic surgeries- portland, or

The following is a list of all spine surgeries offered by Dr. Keenen and Dr. Hiratzka. We treat conditions of the cervical, lumbar, and thoracic spine. Click on any of the following links to learn more about the procedures or the incision, excision, or spine-stabilization aspects of the surgeries. We always encourage patients to educate themselves about the process. In any situation, all of our patients are in good hands and will be provided with an accurate briefing before any type of spine surgery.

Minimally Invasive Surgery

Cervical Artificial Disc Replacement


Lumbar Disc Replacement



What is Minimally Invasive Surgery?

The meaning of “minimally invasive” has changed throughout the years. Today, Dr. Keenen and Dr. Hiratzka perform Minimally Invasive Surgery (MIS) which leaves the strong muscle fiber intact with the spine. MIS uses a smaller incision as well. Dr. Keenen and Dr. Hiratzka have studied with national experts on MIS techniques. Our practice advocates the use of MIS whenever possible. However, only a consultation regarding your specific case will be able to reveal whether MIS is appropriate for you.

Surgical Approach

The surgical approach involves the surgeon’s decision to make one incision or two incisions and to approach the surgery from the posterior (back), anterior (front side), or lateral (flank side). These options differ and can affect the level of invasiveness and recovery time. Dr. Keenen, recognized as one of the best spine surgeons in Portland, makes these choices based on the type and location of your specific problem.

Orthopedic Spine Surgery Patient and Spine Specialist from Pacific Spine Specialists

Before and After Surgery

Before surgery, Dr. Keenen and Dr. Hiratzka believe in exercise therapy to stretch and strengthen the body. This is called pre-habilitation. In addition to rehabilitation after surgery, these processes can speed up recovery time and contribute to the long-term outcomes of spine surgery.

Surgery with Pacific Spine Specialists

The team at Pacific Spine, including Dr. Keenen, Dr. Hiratzka and his personally trained staff, is dedicated to solving your pain and weakness issues caused by conditions of the spine. To learn more, contact us at our Toalatin, OR office.