Michael E. Janssen, DO's portrait
Michael E. Janssen, DO
Clinical Associate Professor
University of Colorado
Thornton, CO

About Michael E. Janssen, DO

Dr. Janssen is Board Certified in both the American Board of Orthopaedic Surgeons and the American Board of Spine Surgeons. He attended the University of Health Sciences in Kansas City, MO. His internship and residency were completed at the Medical College of Georgia. He completed a spine fellowship both at Lakewood Orthopaedic Clinic and in St.Gallen, Switzerland.

Dr. Janssen is a clinical associate professor at the University of Colorado. He enjoys research, national and international lecturing, and teaching as well as keeping up with current trends in the care of patients with spinal disorders. His hobbies include: snow skiing, snowmobiling, water skiing, motorcycles, scuba diving and fly fishing.


1. Congenital Absence of Pericardium: An Unusual Cause of Atypical Angina. Ann. Thoracic Surgery, Chapman, J., Rubin, J., Gorr, C., Janssen, M. 45:91-93, 1988.

2. Lumbar Herniated Disk Disease: Comparison of MRI, Myelography, and Post-Myelogram CT with Surgical Findings. Orthopaedics Vol. 17 #2 Pages 121-128 February 1994.

3. Sexual Functions Following Spinal Arthrodesis. Orthopaedics Today, Vol. 13, #12 December 1993.

4. A Correlation of Cervical Magnetic Resonance Imaging and Discography / Computed Tomographic Discograms. Spine Dec. 15, 1994 Volume 19, Number 24.

5. Epidural Abscess Following Cervical Discography. Complications in Orthopaedics, Summer, 1994.

6. Treatment of Subtrochanteric Fractures of the femur: reduction on the traction table and fixation with dynamic condylar screw. Arch Orthopaedic Trauma Surgery, 1994, 113(3): 138-141.

7. Primary Femoral Shortening Osteosynthesis in the Management of Comminuted Supracondylar Femoral Fractures. Arch Orthopaedic Trauma Surgery, 1994 113(3) 134-137.

8. Early Complications of a Posterior Cervical Screw and Rod Construct. Ruggiero, Sasso, Janssen. Submitted to Cervical Spine Research Society and Spine, 1999.

9. Biological Cages: Specific Tools and Implants in Minimally Invasive Spine Surgery. European Spine Journal, 2000, 9(1): S102-109.

10. A safer posterior lumbar interbody fusion: Abstract. Submitted for Publication.

11. Biomechanics of machined femoral allograft bone for anterior lumbar fusions. Journal of Biomechanics, September 2001. Volume 34 Supplement 1, page S6.

12. Stability of posterior cervical fixation with screw/rod constructs. Journal of Biomechanics, September 2001. Volume 34 Supplement 1, page S61.

13. Biomechanics of variable angle screw fixation in anterior plating of the cervical spine. Journal of Biomechanics, September 2001. Volume 34 Supplement 1, page S61.

14. Outcomes of allogenic cages anterior and posterior lumbar interbody fusion. European Spine Journal, Oct. 2001. Volume 10: S158 - S168.

15. Rectangular PLIF cage helps restore lordosis, prevent migration. Orthopedics Today, November 2001. Volume 21, Number 10, page 17.

16. Outcomes of allogenic cages in anterior and posterior lumbar interbody fusion. The Use of Bone Substitutes in Spine Surgery: A State of the Art Review, November 2002, 74-84.


1. The Spine in Sports, Mosby, Copyright 1996, Chapter fifty-one, Skiing, pg. 541.

2. Languages of the Spine, Editor, Copyright 1995.

3. Tricks of the Trade in Spine Surgery, Copyright 2001.

Articles Written by Michael E. Janssen, DO

Outcomes of Allogenic Cages in ALIF and PLIF: Discussion

A number of studies have examined the outcome of interbody fusions. It should be realized that there are many types of spinal surgical techniques and healing processes.

Fusion Versus Disc Replacement for Discogenic Pain

The ultimate treatment for symptomatic disc degeneration should be disc arthroplasty instead of arthrodesis.

Lumbar Interbody Fusion Devices: A Comparative Study

Preliminary report on a prospective randomized concurrently on-going IDE study comparing the clinical outcomes of several metal cage fixation devices.

Outcomes in Allogenic Cages in ALIF and PLIF: Interbody Spacer

A posterior lumbar interbody (PLIF) spacer is a contoured, wedge-shaped cortical allograft that comes in five anterior heights.

Outcomes of Allogenic Cages in ALIF and PLIF: Biological Fusion Cages

The aim is to provide mechanical support to the segment being fused with biocompatible implant material and to allow the use of autogenous bone to promote spinal fusion.

Outcomes of Allogenic Cages in ALIF and PLIF: Anatomy and Biomechanics of Interbody Fusion

Interbody fusions provide the most logical solution to diseases of the spine's intervertebral discs.

Outcomes of Allogenic Cages in ALIF and PLIF: History

Spinal fusion can be accomplished by various techniques such as posterior and/or anterior procedures with and without internal fixation.

Outcomes of Allogenic Cages in Anterior and Posterior Lumbar Interbody Fusion

This article provides a review of two newly developed biological cages; the femoral ring allograft (FRA) space and the posterior lumbar interbody fusion (PLIF) spacer.

Outcomes of Allogenic Cages in ALIF and PLIF: Outcomes

Outcome discussion of a total of 179 FRA Cages utilized for anterior spinal reconstruction in 137 patients from March 1998 to July 2000.

Fusion vs Disc Replacement for Discogenic Pain: Part 3

We are at the beginning of another period of technology explosion in the field of spine surgery, which can be compared to the "Charnley era" in the development of hip arthroplasty.

Fusion vs Disc Replacement for Discogenic Pain: Part 2

The unique demands on spine arthroplasty implants necessitate that the intervertebral disc is not a true joint and serves a double function of mobility and damping with load repartition properties.

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