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Arthroscopic Treatment of the Painful "Internal" Snapping Hip

Results of a New Endoscopic Technique and Imaging Protocol

Mark E. Flanum, MD^*, James S. Keene, MD^*,, Donna G. Blankenbaker, MD and Arthur A. DeSmet, MD

From the ^* Department of Orthopedic Surgery and Rehabilitation and the Department of Radiology, University of Wisconsin–Madison, Madison, Wisconsin

Address correspondence to James S. Keene, MD, 600 Highland Avenue, K4/730, Madison, WI 53792 (e-mail: keene{at}surgery.wisc.edu).

Background: Traditional surgical treatment for a painful snapping iliopsoas tendon has been an open lengthening of the tendon.

Hypothesis: An endoscopic release will alleviate painful snapping of the tendon.

Study Design: Case series; Level of evidence, 4.

Methods: Six patients with painful snapping hips who had no pain relief after magnetic resonance arthrography, which included injection of bupivacaine into the hip joint, subsequently had an ultrasound evaluation of their iliopsoas tendons and an anesthetic injection into the psoas bursa. In all 6 patients, the injection relieved their hip pain, and in 4, real-time imaging demonstrated snapping of the tendon. All hips were evaluated with the 100-point Harris hip scoring system before and at 1.5, 3, 6, and 12 months after surgery.

Results: Preoperative hip scores averaged 58 points. After surgery, all patients had hip flexor weakness, used crutches for 5 weeks, and had 6-week scores that averaged 62 points. The patients continued to improve, and at 6 and 12 months, their scores averaged 90 and 96 points, respectively, and none had recurrence of their snapping or pain.

Conclusion: Ultrasound-guided anesthetic injection of the psoas bursa is useful to confirm snapping of the iliopsoas tendon as the cause of a patient’s hip pain. Endoscopic release of the tendon is a safe outpatient procedure that provides effective relief of the snapping and pain.

Key Words: arthroscopic release • snapping iliopsoas • snapping hip • results