Prospective observational, national, multicentre, open study with a class III medical device with EC marking. Study to evaluate the clinical benefit of local treatment with KD intra-articular® gel in patients with osteoarthritis of the shoulder, hip, ankle or base of the thumb. The study will be conducted in the Rheumatology Service of Spanish Hospitals under the usual medical conditions, in accordance with routine clinical practice and following the internationally recognised precepts of good clinical practice of ICH and Declaration of Helsinki. The objective is to evaluate the evolution of pain in patients diagnosed with single or preferential symptomatic osteoarthritis of the shoulder or hip treated with KD Intra-Articular® gel 2.2% - 44 mg in 2 ml - (Pronolis® HD one 2.2%), and ankle or base of the thumb treated with KD Intra-Articular® gel 1.6% - 16 mg in 1 ml - (Pronolis® HD mini 1.6%).

Eighty patients will be included among about 6 Spanish Sites. The study comprises a maximum of 6 visits per protocol. At visit 0, informed consent will be obtained, the patient will be checked for fulfil the selection criteria. A pain assessment will also be carried out using a Visual Analogue Scale (VAS) and the corresponding questionnaire will be completed depending on the affected joint. According to the usual clinical practice of the site, the study treatment will be administered. A week after the first infiltration the second visit (V1) will be applied, and the VAS will be repeated. The patient's global clinical impression of change will also be assessed, and along with the Likert scale of satisfaction will be collected. The next visit (V2) will be carried out a week after the second infiltration and the procedures will be the same as those of the previous visit (V1). At 4 (V3), 12 (V4) and 24 (V5) weeks after receiving the third infiltration (V2), follow-up visits will be carried out where the assessment procedures will be the same as in visit 0, in addition to the GCI -C, the Likert scale of satisfaction and the collection of potential AEs and changes in concomitant medication. At each visit, the patient will be given a diary, where they will collect the rescue medication they have needed since the previous visit. In the electronic case report form (eCRF), the rescue medication (analgesics and NSAIDs) that you have needed since the previous visit (V0-V2) or in the month prior to the study visit (V3-V6) will be collected.

Prospective observational, national, multicenter, open study with a class III medical device with EC marking. Study to evaluate the clinical benefit of local treatment with KD intra-articular® gel in patients with osteoarthritis of the shoulder, hip, ankle, or base of the thumb. The objective is to evaluate the clinical benefit of local treatment with KD Intra-Articular® gel 2.2% - 44 mg in 2 ml - (Pronolis® HD one 2, 2%), in patients with osteoarthritis of the shoulder or hip and with KD Intra-Articular® gel 1.6% - 16 mg in 1 ml - (Pronolis® HD mini 1.6%) in patients with osteoarthritis of the ankle or base of the thumb.

The study comprises a maximum of 6 visits per protocol. At visit 0, informed consent will be obtained, the patient will be checked for compliance with all inclusion criteria and no exclusion criteria in the study, and a medical history and physical examination will be carried out. A pain assessment will also be carried out using a VAS and the corresponding questionnaire will be completed depending on the joint to be treated (WOMAC, FAOS, ASES or DASH) and if it is the base of the thumb, the hand dynamometer test will be performed to obtain baseline results. According to the usual clinical practice of the center, the study treatment will be administered, or you will be summoned for administration at a later visit. A week after the first infiltration (V0) the second will be applied, and the VAS will be repeated (V1). The GCI-C evaluation by the patient and the Likert scale of satisfaction will also be carried out. AEs will be collected, if any, and if there have been changes in concomitant medication. The next visit (V2) will be carried out a week after the second infiltration has been placed and the procedures will be the same as those of the previous visit (V1). At 4 (V3), 12 (V4) and 24 (V5) weeks after receiving the third infiltration (V2), follow-up visits will be carried out where the assessment procedures will be the same as in visit 0, in addition to the GCI -C, the Likert scale of satisfaction and the collection of potential AEs and changes in concomitant medication.

At each visit, the patient will be given a diary, where they will collect the rescue medication they have needed since the previous visit. In the eCRF, the rescue medication (analgesics and NSAIDs) that you have needed since the previous visit (V0-V2) or in the month prior to the study visit (V3-V6) will be collected.

The study will be conducted under routine clinical practice conditions, with no restrictions being imposed on the participating doctor prescribing the drug(s) and no interference in normal clinical practice. Except for the scales and/or questionnaires used as measurement instruments in this study and a patient diary where the necessary rescue medication will be collected, the patients included will not be given any intervention, either diagnostic or follow-up, that is not the usual practice in clinical practice.

Inclusion Criteria:

1. Age equal to or greater than 18 years.
2. Patients who come to a control consultation for single or preferential symptomatic osteoarthritis, primary in the case of the hip, shoulder or base of the thumb, or secondary post-traumatic in the case of the ankle.
3. Patients who meet the ACR diagnostic criteria for osteoarthritis of the hip and base of the thumb. Patients who meet the AOFAS diagnostic criteria for ankle osteoarthritis and those for shoulder osteoarthritis defined in the literature.
4. Patients with pain equal to or greater than 4 on the VAS pain scale.
5. Kellgren-Lawrence grade II-III patients in an X-ray performed within 18 months prior to inclusion.
6. Patients in whom viscosupplementation is indicated regardless of their inclusion in the study.
7. Patients able to read and understand the Patient Information Sheet and sign, if accepted, the Informed Consent Form.
8. Patients able, at the discretion of the investigator, to comply with the requirements of the study and without impediments to follow the instructions and assessments throughout the study.

Exclusion Criteria:

1. Known hypersensitivity to sodium hyaluronate or other study treatment components.
2. Previous trauma or surgical intervention in the affected joint (except in ankle osteoarthritis).
3. Participation in any other clinical trial or use of any drug or experimental device, currently or in the 4 weeks prior to inclusion in the study.
4. Swelling, exacerbation, or significant effusion in the affected joint.
5. Septic and aseptic arthritis.
6. Skin disorder or infection at the site of infiltration.
7. Patients requiring intra-articular infiltration in two joints.
8. Viscosupplementation of the affected joint within 6 months prior to the start of treatment.
9. Infiltration of steroids in the affected joint in the 3 months prior to the start of treatment.
10. History of autoimmune, microcrystalline rheumatological diseases or connective tissue diseases.
11. Coagulation disorders and/or anticoagulant medication that contraindicates infiltration.
12. Women who are pregnant, suspected of being pregnant or breastfeeding.

The participation of 80 patients is expected (20 in each joint), diagnosed with osteoarthritis of the shoulder, hip, ankle or base of the thumb thanks to the collaboration of the rheumatology service of the public or private Spanish hospitals. The patients to be included in the study must meet all the above-mentioned screening criteria.