The patient was a 57-year-old man with a history of coming into contact with chemical gases during the war of 1981. He was referred to the emergency room (ER) with an acute abdomen and hemorrhage about 6 years ago. At that time, the diagnosis was acute renal failure and myeloma. The patient's blood abnormality was treated very well in the hematology department and he went under dialysis. He did not come back to the hematology department for myeloma maintenance therapy until four months ago when he came to the ER with hoarseness, tenderness in a hind limb, bone pains, movement limitation in the forelimbs with severe pain (VAS 6) in the left clavicle. He underwent 10 sessions of clavicle radiotherapy before admission to the pain clinic. His clavicular pain did not respond to radiotherapy and opioids.

In the physical examination, the patient complained of generalized bone pain especially in left clavicle. There was a 5 × 7 cm mass in 1/3 of the internal part of the clavicle (Fig. 1). There was no redness or edema and the mass was fixed to the bone and in pain on palpation. It was a new localized, deep, uncomfortable pain in the left clavicle.

Both shoulders and arms were tender with movement limitation. Bilateral limited elbow extension and flexion deformity were seen. Hind limbs force was decreased (2 from 5). There was no sensory deficit. In the shoulder examination, there was no hypertrophy, heat, erythema and tenderness. Clavicle conventional radiofrequency was chosen as a treatment. The patient's blood test and coagulation test were normal (platelet counts = 7,400 per microliter). In the plain radiography other than widespread lytic myeloma lesions especially in the shoulders and arms, there was a big lesion in the left clavicle which was also detected in the chest X-ray and chest CT scan (Fig. 2).

After IV sedation (midazolam 1 mg and fentanyl 50 mg), prep & drape were done in the supine position. The clavicular mass was antisepticised and the anesthetic was lidocaine 1%. Two radiofrequency needles (OWL, Diros Technology Inc., Ontario, Canada. sharp, 20 gauge, 100 mm, active tip 10 mm), 1.5 cm from each other were inserted into the mass. Under the guide of the fluoroscopy, the needles were inserted into the middle part of the mass and during the pass, the needles were aspirated for any possibility of blood. And then, after passing the bone and feeling a sense of pop in the non-ionic water, 3 ml of soluble contrast media (Iodixanol 320) were injected and its distribution was seen directly and the contours of mass were clear. The patient informed us of any shooting pain in the upper extremity during the procedure. After placing the pads on the patient's arm, the stylet was pulled out and the radiofrequency probe was inserted. Then, two times a radiofrequency current at 90℃ was applied for 60 seconds at the two points 1cm apart from each other. After that, 2 ml of 0.5% ropivacaine along with triamcinolone 40 mg were injected in each needle and then the needle and the probe were pulled out together (Fig. 3-5). The procedure went very smoothly without any pain or need for more analgesic injection. In the recovery room, VAS dropped to zero and movement of the hands improved. He could move his shoulder and arms more comfortably. There was no hematoma or sensory and motor deficits or any kind of radiating pain in the extremity. The visual analogue pain score (VAS from 0 to 10) decreased from 8 to 0. In the next 3 months of follow-up, the patient was very satisfied with the procedure and there was no pain at the clavicular site and did not need any analgesic for it. The mass gradually became smaller. There were no complications. He did not suffer from any pain at the clavicular site until he died after 3 months.

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Our patient with painful myeloma of the clavicle responded very well to conventional radiofrequency and his pain was completely gone. The use of radiofrequency current at 90℃ for 60 seconds had very good result in managing painful myeloma of the clavicle. We used an instrument that is for neuroablation and available in most pain clinics. Using this instrument allows more people to benefit from radiofrequency in the future.

The pathophysiology of cancer pain is a local or systemic inflammatory response by producing pro-inflammatory cytokines that facilitates pain transmission. Invasion of cancer cells to mechanically sensitive tissues (e.g. visceral pain) or the entrapment and injury of nerves (e.g. neuropathic pain) causes pain.

After pain generation, there is central sensitization and chronic pain. Tumors have immune system cells, which by releasing factors like endothelin, prostaglandin and tumor necrosis factor alpha (TNF-α), that cause the stimulation or sensitivity of afferent nerves. Tumors also release some proteins which through acidosis cause local pain. Proteolytic enzymes and sensory and sympathetic nerve injury result in neuropathic pain. Nerve infiltration of sensitive bone marrow causes pain, osteolysis and fracture of abnormal bone structure. Stimulation of the sensitive afferent nerves in the bone cortex and the surrounding tissues can also be a reason for pain [9-13].

High frequency current can manage this pain. A high alternating frequency current enters the applicator. Its result is ion movement in the tissue producing heat and destroying the surrounding tissue and tumor. This severe heat destroys tumor cells, decreases cytokines and tumor factors involved in both nerve sensitization and osteoclast activity. In addition, stopping the tumor growth into the periosteum and surrounding tissue manages the pain and decreases microfractures [8,14,15].

Radiofrequency can be used in patients with moderate to severe pain (4 to 10). The pain must be limited to one or two sites and confirmed by cross-sectional imaging. The lesion has to have an osteolytic or combined osteolytic and osteoblastic nature or be composed of soft tissue [14,15].

Dupuy reported on the use of radiofrequency in metastatic bone pain management which was confirmed by other studies [16]. The primary and secondary success rates were 87% and 83%. Surgery had the same success but with multiple complications. On the other hand, radiofrequency costs much less. In addition, it is the gold standard treatment for osteoid osteomas [16,17]. The success rate of radiofrequency in the liver, kidney, lungs and bone tumor ranges from 70-95% depending on the tumor location and nature. Radiofrequency is a safe non-invasive method. The radiofrequency probe is usually placed into the tumor with the help of ultrasonography, CT, MRI or fluoroscopes. Controlling the ablation procedure depends on the instrument. Usually, impedance depending systems are used. Radiofrequency does not have major contraindication and can easily be repeated or mixed with other treatments [18].

Other benign conditions (chondroblastoma, osteoblastoma, giant cell tumor, etc.) can also be treated by this technique. Today, we are witnessing an improvement in minimally invasive therapies like chemoablation, thermoablation, percutaneous grafting, acetabuloplasty and osteoblast skin grafts and vertebroplasty. Microwave, radiofrequency, ultrasound or high frequency laser is used and ablation happens at over 60℃ so that tumor cells die. Usually a radiofrequency below 30 MHz is used and most of the instruments are around 500-375 KHz. Ablation can occur through cryotherapy with necrosis occurring below 20 degrees [19].

In a study by Aono and coworkers, cooled RF Radiofrequency was effective in managing intractable pain due to bone metastasis in 9 metastasis cancer patients (metastasis to the femur, vertebrae column, pelvis, scapula and Humerus) with no possibility of surgery and in patients that did not respond to radiotherapy and opioid treatments [20].

Goetz and coworkers reported 43 patients with painful osteolytic bone metastasis who were treated with image-guided radiofrequency ablation using multiple needles [18]. The primary pain score was 4 out of 10 and the patients did not respond to radiotherapy or opioids or were suitable candidates for these kinds of treatments. The pain score dropped from 7.9 to 4.5, 3 and 1.4. Pain management was 95% successful and opioid consumption decreased in weeks 8 and 12. Radiofrequency in the pain management of bone cancer is a cheap, effective method with few complications.

Conventional radiofrequency use in myeloma of the clavicle and its perfect response showed that conventional radiofrequency could be an effective method in managing painful osteolytic myeloma lesions. More use of this method in the future and gathering more information can introduce this method as a terminal method for managing painful bony metastatic lesions.

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