By Pat Anson, PNN Editor

Doctors and patients should be more cautious about using corticosteroid injections for pain relief, according to new studies that warn of rare, but serious long-term complications for patients who receive epidurals during childbirth or high doses and multiple injections in their hips.

Researchers at Kaiser Moanalua Medical Center in Hawaii looked at health data for nearly 700 patients with hip osteoarthritis and found that those who received steroid injections were 8.5 times more likely to develop rapidly destructive hip disease (RDHD), a condition that causes the loss of blood flow and death of bone tissue in the hip.

Higher rates of RDHD were especially apparent in patients receiving multiple and/or high-dose injections of the steroid triamcinolone. The risk of RDHD following a single, low-dose injection was about two percent, but rose to five percent following multiple low-dose injections or a single high-dose injection, and up to 10 percent following multiple high-dose injections.

“While the risk of RDHD following a single low-dose (40 mg or less) triamcinolone injection is low, the risk is higher following high-dose (80 mg or more) injection and multiple injections. These findings provide information that can be used to counsel patients about the risks associated with this common procedure. In addition, caution should be taken with intra-articular hip injections utilizing 80 mg of corticosteroid and multiple injections,” wrote lead author Kanu Okike, MD, of Hawaii Permanente Medical Group in Honolulu.

As they became more aware of a possible link with RDHD, orthopedic surgeons at the hospital started ordering fewer hip corticosteroid injections. In subsequent years, the number of RDHD cases decreased. The hospital also added a discussion of post-injection RDHD to the informed consent process for patients and stopped performing high-dose corticosteroid injections.

The study, recently published in The Journal of Bone & Joint Surgery, is believed to be the largest to date of patients with post-injection RDHD.

Epidural Injections

Two new studies have also found that women receiving epidural injections for pain relief during labor are at high risk of long-term headaches and chronic back pain if the needle accidentally punctures the dural lining of the spinal cord. Dural punctures or “wet taps” cause the leak of spinal fluid, which can result in serious neurological complications.  

“I’ve likely performed more than 10,000 epidurals in my lifetime, and I still have wet taps from time to time,” Pamela Flood, MD, a professor of anesthesiology at Stanford University School of Medicine, told Anesthesiology News. “But no matter how many we’ve seen, we still feel terrible about each one. We’re trying to relieve people’s pain and give them a wonderful childbirth experience, and the last thing we want to do is cause them complications.”

A study published in the journal Anaesthesia found that over half of women (58%) with an accidental dural puncture were still experiencing headaches 18 months after the epidural, and nearly half (48%) suffered from chronic low back pain. A recent study in the British Journal of Anaesthesia had similar findings.    

Dural punctures during epidurals are relatively uncommon. Women are usually warned there is a risk of short-term headaches, but not about long-term health problems.

“While this information has been creeping into our consciousness in the form of retrospective trials, only this year has it been confirmed with two large prospective trials,” Flood said. “Unfortunately, clinicians have been slow to hear this, perhaps because we don’t want to admit that the short-term concern that we have been discussing for years carries long-term consequences in a significant percentage of women.”

The two most common types of medications used during epidural injections are anesthetics (lidocaine or bupivacaine) or corticosteroids (betamethasone, dexamethasone, hydrocortisone, methyl-prednisolone, triamcinolone). 

In addition to treating labor pain, epidural steroid injections are widely used for back pain. About 9 million epidural steroid injections are performed annually in the U.S., even though they are not FDA-approved. The FDA has warned that injection of steroids into the epidural space can result in rare but serious neurological problems, including loss of vision, stroke and paralysis. Some patients have also developed arachnoiditis, a chronic and painful inflammation of the spinal cord, after getting steroid injections for back pain.