Pilot, prospective, randomized study to compare the effectiveness of two techniques against chronic hip pain :cooled radiofrequency on sensory innervation of the hip and intra-articular infiltration of local anesthetic and corticoid.

EudraCT protocol code. 2018-000269-36

Promoter / Principal Investigator. Jorge Orduña Valls

Name of the person responsible for the monitoring:

Nativity Well of the Rose.

Design. Pilot, prospective, randomized study to compare the effectiveness of two techniques against chronic pain of hip: radiofrequency cooled on sensory innervation of the hip and intra-articular infiltration of local anesthetic and corticoid.

Phase of the trial. Phase IV, efficacy evaluation with respect to standard treatment.

Conditions to study. Percentage of subjects with VAS reduction greater than 50% compared to baseline at three months after application of the technique in the two treatment groups.

Longer duration of the analgesic effect (defined as a reduction of the VAS greater than 50% basal) at six months from the application of the technique in patients with hip pain.

Intervention. Application of radiofrequency cooled on nerve endings of the hip. The standard treatment Non-surgical consists of intra-articular injection of local anesthetic and corticoid.

Main and secondary objective.

Main goal:

• Percentage of subjects with improvement in the two groups defined as VAS reduction greater than 50% with respect to the baseline after three months from the application of the technique.
• Compare the persistence of the clinical effect in terms of pain reduction (quantified by a reduction of 50% in the VAS scale compared to the baseline) after six months after the application of the Radiofrequency cooled on sensitive nerve branches of the hip compared to intra-articular injection of local anesthetic and corticoid.

Secondary objectives:

• Compare the improvement of functional capacity of patients submitted to radiofrequency cooled compared to those treated by intra-articular injection of local anesthetic and corticosteroid measured by the WOMAC and Oxford Hip score scales.
• Compare the duration of the clinical improvement in terms of pain reduction quantified by the scale VAS (analog visual scale) per year after the application of both techniques.
• To compare the improvement of the quality of life of patients subjected to radiofrequency cooled with respect to those treated by intra-articular injection of local anesthetic and corticosteroid measured by the SF 36 scale.

Main valuation variable.

Main variable:

The evaluation of pain by means of the Visual analogic scale (VAS) A significant reduction in pain will be considered when VAS decreases by> 50% of the baseline value.

Secondary variables:

• Functional improvement valued by the scales: Oxford Hip score, WOMAC
• Better of the quality of life valued by the SF 36 scale
• The duration of the clinical effect by means of the duration of improvement of the VAS scale.

Population under study and total number of patients. Adult patients with chronic hip pain greater than three months who has not responded to treatment conservative and that is not subsidiary of surgery either by the evolutionary stage or by contraindications related to morbidity terms.

Period of follow-up. The duration of the intervention is 12 months from randomization. After the scheduled interventions, patients will be scheduled for monthly follow-up, three, six and twelve months after the procedure

Pilot, prospective, randomized study to compare the effectiveness of two techniques against chronic hip pain :cooled radiofrequency on sensory innervation of the hip and intra-articular infiltration of local anesthetic and corticoid.

Phase of the trial. Phase IV, efficacy evaluation with respect to standard treatment.

Conditions to study. Percentage of subjects with VAS reduction greater than 50% compared to baseline at three months after application of the technique in the two treatment groups.

Longer duration of the analgesic effect (defined as a reduction of the VAS greater than 50% basal) at six months from the application of the technique in patients with hip pain.

Intervention. Application of radiofrequency cooled on nerve endings of the hip. The standard treatment Non-surgical consists of intra-articular injection of local anesthetic and corticoid.

Main and secondary objective.

Main goal:

• Percentage of subjects with improvement in the two groups defined as VAS reduction greater than 50% with respect to the baseline after three months from the application of the technique.
• Compare the persistence of the clinical effect in terms of pain reduction (quantified by a reduction of 50% in the VAS scale compared to the baseline) after six months after the application of the Radiofrequency cooled on sensitive nerve branches of the hip compared to intra-articular injection of local anesthetic and corticoid.

Secondary objectives:

• Compare the improvement of functional capacity of patients submitted to radiofrequency cooled compared to those treated by intra-articular injection of local anesthetic and corticosteroid measured by the WOMAC and Oxford Hip score scales.
• Compare the duration of the clinical improvement in terms of pain reduction quantified by the scale VAS (analog visual scale) per year after the application of both techniques.
• To compare the improvement of the quality of life of patients subjected to radiofrequency cooled with respect to those treated by intra-articular injection of local anesthetic and corticosteroid measured by the SF 36 scale.

Inclusion Criteria:

• Patient over 18 years old.
• Chronic hip pain (more than 3 months) that has not responded to conservative treatment, therapy pharmacological, physiotherapy or TENS).
• Mechanical pain in the affected limb with a VAS of at least 50 mm during the ambulation
• Patients for whom it is possible to carry out all the scheduled visits of the study, with capacity for go in the established deadlines to the control visits.
• Greater than 50% improvement in the VAS scale after the two anesthetic blocks made with anesthetics local of different duration (bupivacaine 0.25% and mepivacaine 2%)
• Moderate to severe osteoarthrosis determined with grades Kellgren-Lawrence II, III, IV.
• Stable doses of analgesics for at least 30 days before starting the study.
• Patients who have performed the Oxford Hip Score and WOMAC test 3 months or less before the study.
• Absence of allergy or adverse events known to any of the medications administered:

local anesthetics of amide group and iodinated contrasts.

-Negative pregnancy test (women of childbearing age) and commitment to guarantee contraception during the study

Exclusion Criteria:

• Signs of alarm or infection in the joint affects.
• Signs of active infection, immunosuppression or active HIV.
• Severe psychiatric diseases.
• Patient with hip prosthesis.
• Pain added to an unexplained weight loss of more than 5% 90 days or less before the beginning of the study.
• Pain of root origin established in the affected limb, or neurodegenerative diseases of the Peripheral nervous system.
• Patients with basic tumor pathology or who have had cancer in the five years prior to the inclusion.
• Alterations of the coagulation or taking of anticoagulants / antiaggregants (except aspirin 150 or 300) mg / day) at the beginning of the study, which can not be suspended for basic pathology during an interval prudent for the realization of the technique.
• Patient that has participated in a clinical study the previous 30 days in which they are performed interventions that may affect the results of the study.
• Patient with a diagnosis of disorder due to substance abuse or alcoholism.
• Patient who is in process for the award of a disability or degree of disability.
• Pregnant or lactating patient.
• Patient under treatment with opioids with doses greater than the equivalent to 90 milligrams of oral morphine / day.