Piriformis syndrome: diagnosis, treatment, and outcome--a 10-year study.

Abstract

OBJECTIVES:

To validate an operational definition of piriformis syndrome based on prolongation of the H-reflex with hip flexion, adduction, and internal rotation (FAIR) and to assess efficacy of conservative therapy and surgery to relieve symptoms and reduce disability.

DESIGN:

Before-after trial of cohorts identified by operational definition.

SETTING:

Outpatient departments of 2 hospitals and 4 physicians' offices. Surgery performed at 3 hospitals.

PATIENTS:

Consecutive sample of 918 patients (1014 legs) with follow-up on 733.

INTERVENTION:

Patients with significant (3 standard deviations [SDs]) FAIR tests received injection, physical therapy, and serially reported pain and disability assessments. Forty-three patients (6.47%) had surgery.

MAIN OUTCOME MEASURES:

Likert pain scale. Subjective estimates of disablement in activities of daily living and instrumental activities of daily living.

RESULTS:

At 3 SDs, the FAIR test had sensitivity and specificity of.881 and.832, respectively. Seventy-nine percent (514/655) of FAIR test positive (FTP) patients improved 50% or more from injection and physical therapy at a mean follow-up of 10.2 months. Average improvement was 71.1%. Of 385 FTP patients with disability data, mean disability fell from 35.37% prestudy (SD =.2275) to 12.96% poststudy (SD =.1752), a 62.8% improvement. Twenty-eight surgical FTP patients (68.8%) showed 50% or greater improvement; mean improvement was 68% at a mean follow-up of 16 months. Surgery reduced the mean FAIR test to 1.35 +/- 2.17 months postoperatively. FTP patients generally improved 10% to 15% more than others after conservative treatment.

CONCLUSIONS:

The FAIR test correlates well with a working definition of piriformis syndrome and is a better predictor of successful physical therapy and surgery than the working definition. The FAIR test, coupled with injection and physical therapy and/or surgery, appears to be effective means to diagnose and treat piriformis syndrome.

• Authors: Loren M Fishman, George W Dombi, Christopher Michaelsen, Stephen Ringel, Jacob Rozbruch, Bernard Rosner, Cheryl Weber
• Journal: Archives of physical medicine and rehabilitation (Arch Phys Med Rehabil) Vol. 83 Issue 3 Pg. 295-301 (Mar 2002) ISSN: 0003-9993 [Print] United States
• PMID: 11887107 (Publication Type: Journal Article, Review)
• Copyright: Copyright 2002 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation

Chemical References

• Anesthetics, Local
• Lidocaine

Topics

• Activities of Daily Living
• Anesthetics, Local (therapeutic use)
• Electric Stimulation
• Electrodiagnosis (methods)
• Female
• H-Reflex (physiology)
• Humans
• Lidocaine (therapeutic use)
• Male
• Middle Aged
• Neural Conduction (physiology)
• Physical Therapy Specialty
• Sciatica (diagnosis, surgery, therapy)
• Sensitivity and Specificity
• Syndrome
• Treatment Outcome