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Clinical Observations |
1 Department of Radiology and Imaging, Hospital for Special Surgery, 535 East
70th St., New York, NY 10021.
2 Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY
10021.
Received July 30, 2004;
accepted after revision October 25, 2004.
Address correspondence to R. S. Adler
(adlerr{at}hss.edu).
Abstract
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CONCLUSION. Sonography-guided iliopsoas bursal/peritendinous injections are useful in determining the cause of hip pain. They can provide relief to most patients with iliopsoas tendinosis/bursitis after hip replacement. The results of injection alone are not as successful in cases of idiopathic iliopsoas tendinosis/bursitis, but the technique can help determine which patients may benefit from a surgical tendon release.
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In cases where iliopsoas tendinosis is suspected, an anesthetic–corticosteroid injection into the tendon's adjacent bursa can confirm the diagnosis or help determine an alternate cause. Complete or near complete relief of the symptoms confirms the diagnosis. This injection may provide temporary or permanent symptomatic relief and may postpone or avoid surgical intervention [1]. Failure of the injection to provide relief may indicate an alternate cause for hip pain, such as labral degeneration or tear. Current imaging techniques, particularly MRI, can be helpful in delineating anatomic abnormalities. However, the abnormalities seen on imaging are multifactorial and cannot be readily sorted out during physical examination alone.
Interventional musculoskeletal procedures have traditionally been guided by fluoroscopy or CT. However, these imaging techniques are not without limitations [7]. Fluoroscopy does not provide direct visualization of soft-tissue interfaces and requires needle manipulation with test injections of contrast material to confirm needle placement. CT allows for direct visualization of soft tissue; however, it traditionally has not been performed in real time, provides poor tissue contrast, and requires intermittent needle manipulation. Real-time CT fluoroscopy is an option on many new generation scanners but it does not provide the same degree of soft-tissue contrast present on sonography. Real-time observation during needle placement under and during injection would be possible, however. Both fluoroscopy and CT use ionizing radiation.
In this article, we will describe our experience using sonography guidance to perform therapeutic injections of the iliopsoas bursa. The real-time nature of sonography allows one to continuously monitor needle placement and the distribution of the therapeutic agent.
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Patient charts were reviewed and immediate follow-up for 17 of the 39 patients (all from Group B) was documented in their medical charts. This information was recorded after receiving telephone calls from these patients within 1 to 5 days after the injection. For the remaining 22 patients, immediate pain assessment was based on their recollection of pain relief, which was obtained during the initial follow-up telephone call.
All 39 patients were sent a standardized pain assessment questionnaire and then contacted by telephone to discuss the survey. Patients were asked to rate their pain relief in quartile percentages (i.e., 0–25%, 25–50%, etc.). If immediate follow-up data were not available in their charts, patients were asked to recall their percentage of pain relief within the first 24 hr after the procedure. They also used the percentage scale to assess their present pain relief compared with their baseline (i.e., before the injection). Inquiries were made about the use of antiinflammatory drugs at the time of the injection and the time of the follow-up telephone call. In addition, the patients were asked if they would consider undergoing the procedure again should the problem recur.
Those patients who were contacted at less than 12 months and who indicated a positive response were contacted again via telephone a year after the injection. For purposes of this study, a positive outcome was defined as pain relief subjectively greater than 50%.
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Twenty-three patients received more than one telephone call, provided that the first telephone call occurred less than a year after the injection and the patient indicated an initial positive response. For Group A patients who received more than one call, the initial call occurred a mean of 3.9 months after the injection and the second call, a mean of 13 months after injection. For Group B patients, the initial call was made a mean of 3.5 months after the first injection and the second call, a mean of 18 months after the injection.
Thirty-seven of the 39 patients had not been taking analgesics for a minimum of 2 weeks at the time of the injection. The remaining two patients (from Group B), who only experienced relief for the first few hours, were taking oral analgesics at the time of the injection and were also taking them at the time of the follow-up telephone call. Neither of these patients was considered a responder to the injection and both had other etiologic factors implicated as their source of pain.
Twenty-seven of the 39 patients were willing to repeat the procedure. Those patients who were most willing to undergo the procedure again were those who experienced relief extending beyond the first 24 hr.
The results varied in the two groups. In Group A, one patient did not obtain immediate or delayed relief despite two iliopsoas injections. It was thought that the hip pain was not related to the iliopsoas tendon. Of the remaining 10 patients, all experienced immediate relief, with nine of 10 (90%) maintaining at least 50% pain relief at 1 year. The one patient without sustained success had relief for 2 weeks, while a second injection did not provide improvement. One patient had three injections, while five patients received two injections, including the patient not achieving sustained relief (mean time for pain relief, 9.1 months; range, 2 weeks to 17 months). One of the injections was repeated due to technical problems.
In Group B, 10 of the 28 patients did not experience immediate or delayed relief. Thus, it was thought that the pain was not related to the iliopsoas tendon. Of the 10, one underwent varus osteotomy of the proximal femur with resolution of pain. One experienced relief after arthroscopic débridement of a labral tear. One had continuing problems from untreated hip dysplasia. Two had refractory pain after hip arthroscopy. One patient had relief after a subsequent intraarticular injection and was considered a candidate for arthroscopic débridement. In four patients, the underlying cause remains unclear.
Of the remaining 18 patients in Group B, all sustained immediate pain relief after iliopsoas injection. Even fewer achieved sustained relief; eight of 18 (44%) of these patients, including one who required two injections, had continued relief at 1 year. One patient has had three injections, each providing short-term relief. The patient was not willing to consider surgical treatment.
Four Group B patients underwent surgical release of the iliopsoas for continued symptoms after temporary relief from iliopsoas injections. One procedure was a complete release done open in a patient with a previous varus osteotomy. The patient obtained complete pain relief. Three releases were partial and done arthroscopically. Two of the three obtained relief from the procedure; the third is under consideration for a repeat tendon release. Of the remaining patients who had temporary relief, four had improvement after a course of physical therapy. One patient had relief after an additional cortisone injection to the hamstring origin.
No major complications occurred from the injections. Two patients experienced a temporary femoral nerve palsy, which cleared in 30 min despite visualization of the femoral neurovascular bundle. There were no infections or vascular injuries.
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The iliopsoas muscle, the most powerful flexor of the thigh, is a compound muscle composed of the psoas and iliacus muscles [9]. The psoas, originating from the lumbar spine, and the iliacus, arising from the pelvis, converge to form the iliopsoas muscle and insert anteromedially onto the lesser trochanter of the femur as the iliopsoas tendon. Problems may occur when inflammation of the tendon is present or if bursitis exists between the tendon and the pelvis or anterior hip capsule [1, 2]. Iliopsoas irritation may also occur after total hip arthroplasty, especially if a prominent socket impinges on the tendon [3, 5, 6, 10].
Using well-defined landmarks, the tendon is sonographically apparent at the level of the iliopectineal eminence (Fig. 1). Sonography-guided needle placement in this location will generally allow distention of the iliopsoas bursa. As with other sonography-guided interventions, we have found a test injection with local anesthetic is helpful to confirm needle position. The real-time nature and lack of ionizing radiation allow simple continuous needle adjustments. Sonography also has the advantage of direct visualization of the neurovascular bundle. Application of deep local anesthesia may result in temporary femoral nerve palsy, as was the case in two of our patients (it cleared within 30 min). In no patient was direct impingement of the neurovascular bundle an issue.
Some limitations of our study include its retrospective nature, which does not allow a systematically controlled and identical follow-up for each patient. Follow-up interviews varied with respect to the timing of the initial telephone contact after the injection. The use of a visual pain scale and asking the patient to recall level of pain are subjective. Alternatively, it is their subjective assessment that brings them to seek medical attention. Performance of a well-defined prospective study may be of value in the future, in which patients are randomized to different therapy regimens. Large body habitus occasionally posed problems in visualizing the tendon and tendon anisotropy. In patients with total hip replacements, there was anatomic distortion, with the tendon often more anterior and medial. In cases of severe tendinosis, the tendon was not as readily apparent as in the population with de novo problems or in those patients referred after hip arthroscopy. There was a short learning curve in the total amount of volume of anesthetic–cortisone mixture to inject and in optimally positioning the needle to ensure effective bursal distention.
Our initial experience with sonography-guided iliopsoas bursal/peritendinous injections has proven useful in determining the cause of hip and/or groin pain. In our experience, anesthetic–corticosteroid injection performed under sonography guidance provides a safe and effective method to inject the bursa and to exclude the iliopsoas tendon as a possible cause for pain. In patients with temporary relief, the technique is of value to determine whether patients would be candidates for surgical tendon release. These injections can provide long-term relief in arthroplasty patients and in some nonarthroplasty patients as well. Ninety percent of patients with iliopsoas-related symptoms after hip arthroplasty achieved significant relief without the need for surgical release or revision arthroplasty. The lower success rate in the nonarthroplasty patients probably reflects other causative factors involved in their groin pain, such as labral degeneration or anterior impingement, which are difficult to rectify by injection alone. In our series, a substantial number of nonarthroplasty patients (10) were ultimately shown to have other etiologic factors (e.g., labral tears) as the source of their hip pain. Eighteen of 28 (64%) in this group of patients responded, helping to confirm the diagnosis of iliopsoas tendinosis.
Based on our initial experience, sonography-guided iliopsoas peritendinous injections have become a standard part of the clinical algorithm in evaluating these patients at our institution. In patients with indwelling hip replacements, in whom aseptic loosening or infection are excluded, sonography-guided injection has become the next step in the assessment of groin pain. In those patients with de novo hip problems, the rationale to try a sonography-guided injection remains exclusionary—that is, to help sort out possibilities suggested by clinical examination and imaging assessments. In patients who have long-term relief, sonography-guided injection provides a useful therapeutic option to surgical release. The relative ease of the procedure coupled with a very low morbidity makes it an excellent choice in the treatment of refactory iliopsoas tendinitis bursitis.
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