Best Doctors for Revision Hip Replacement in India

Find the Right Doctor

Listing 995 verified top Doctors for Revision Hip Replacement in India, experienced in diagnosing and treating a wide range of conditions.

Dr. Samar Kumar Gupta

Dr. Samar Kumar Gupta

Orthopaedic and Joint Replacement Surgeon
Kolkata, India
45+ years of experience
Consultant
WhatsAppWhatsApp Us
  • Dr. Samar Kumar Gupta is a leading Orthopedic & Joint Replacement Surgeon with n extensive experience of +42 years. 
  • Some of his professional affiliations include, memberships of the Indian Orthopaedic Association, West Bengal Orthopaedic Association and the Indian Medical Association (IMA).
  • Dr. Gupta completed his graduation in 1976 from Calcutta National Medical College, followed by D. Ortho in 1981. He then did his MS in 1988. 
  • He has performed thousands of around 500 joint replacements, trauma surgeries and numerous mega prosthesis for tumours.
  • Dr. Gupta is reputed for his expertise in performing joint replacement and reconstructive surgeries. He also does prosthesis for tumours and trauma surgeries.
  • He has authored a few research papers for medical journals. 
Show more
  • Dr. Samar Kumar Gupta is a leading Orthopedic & Joint Replacement Surgeon with n extensive experience of +42 years. 
  • Some of his professional affiliations include, memberships of the Indian Orthopaedic Association, West Bengal Orthopaedic Association and the Indian Medical Association (IMA).
  • Dr. Gupta completed his graduation in 1976 from Calcutta National Medical College, followed by D. Ortho in 1981. He then did his MS in 1988. 
  • He has performed thousands of around 500 joint replacements, trauma surgeries and numerous mega prosthesis for tumours.
  • Dr. Gupta is reputed for his expertise in performing joint replacement and reconstructive surgeries. He also does prosthesis for tumours and trauma surgeries.
  • He has authored a few research papers for medical journals. 
Dr. Sameer Ali P

Dr. Sameer Ali P

Arthroscopy and Sports Medicine
Calicut, India
14+ years of experience
Consultant
WhatsAppWhatsApp Us
  • Dr. Sameer Ali P is a renowned Orthopedic Surgeon with 11+ years of experience.
  • He holds extensive experience in Primary and Revision Joint Replacement of Hip, Knee & Shoulder, Arthroscopic Surgeries of Knee, Shoulder, Elbow & Hip, Complex Navigated Primary & Revision Joint Replacement, Complex Shoulder & Knee Arthroscopy, and Cartilage preservation surgeries of Knee & Ankle. 
  • He completed his MBBS from ACME, Pariyaram in 2005 followed by MS in Orthopedic and D.Ortho from Government Medical College, Thiruvananthapuram in 2010. 
  • In 2013, he attained a fellowship in Joint Replacement and Arthroscopic surgery from Germany.
  • In 2016, he completed a special fellowship in Revision Joint Replacement from Lancaster General Hospital, USA.
  • He is the first surgeon in North Kerala to have performed Reverse Shoulder Replacement.
  • He has also conducted around 1000 primary and 200 revision hip, knee, and shoulder replacement surgeries.
Show more
  • Dr. Sameer Ali P is a renowned Orthopedic Surgeon with 11+ years of experience.
  • He holds extensive experience in Primary and Revision Joint Replacement of Hip, Knee & Shoulder, Arthroscopic Surgeries of Knee, Shoulder, Elbow & Hip, Complex Navigated Primary & Revision Joint Replacement, Complex Shoulder & Knee Arthroscopy, and Cartilage preservation surgeries of Knee & Ankle. 
  • He completed his MBBS from ACME, Pariyaram in 2005 followed by MS in Orthopedic and D.Ortho from Government Medical College, Thiruvananthapuram in 2010. 
  • In 2013, he attained a fellowship in Joint Replacement and Arthroscopic surgery from Germany.
  • In 2016, he completed a special fellowship in Revision Joint Replacement from Lancaster General Hospital, USA.
  • He is the first surgeon in North Kerala to have performed Reverse Shoulder Replacement.
  • He has also conducted around 1000 primary and 200 revision hip, knee, and shoulder replacement surgeries.
Dr. Sanjay Pai

Dr. Sanjay Pai

Foot and Ankle Specialist
Bangalore, India
36+ years of experience
Senior Consultant
4.8 (23 Ratings)
WhatsAppWhatsApp Us
  • Dr. Sanjay Pai is a renowned orthopedic surgeon having an experience of nearly 33 years. 
  • He is the founder of unicompartmental replacement, bilateral simultaneous knee and hip replacements in south India.
  • He is the most experienced pelvic surgeon and adept in performing primary and revision surgeries of the hip and knee.
  • Dr. Pai has done more than 15000 joint replacement surgeries.
  • He is a faculty for teaching joint replacement fellowship at Apollo Hospitals, Bangalore.
  • He is a member of various esteemed Associations like Indian Orthopedic Association and Bangalore Orthopedic Society.
  • After completing MBBS from Bangalore University in 1982, he did MS (Orthopaedics) from University of Mumbai, Mumbai in 1984.
Show more
  • Dr. Sanjay Pai is a renowned orthopedic surgeon having an experience of nearly 33 years. 
  • He is the founder of unicompartmental replacement, bilateral simultaneous knee and hip replacements in south India.
  • He is the most experienced pelvic surgeon and adept in performing primary and revision surgeries of the hip and knee.
  • Dr. Pai has done more than 15000 joint replacement surgeries.
  • He is a faculty for teaching joint replacement fellowship at Apollo Hospitals, Bangalore.
  • He is a member of various esteemed Associations like Indian Orthopedic Association and Bangalore Orthopedic Society.
  • After completing MBBS from Bangalore University in 1982, he did MS (Orthopaedics) from University of Mumbai, Mumbai in 1984.
Dr. Sumit Bhushan Sharma

Dr. Sumit Bhushan Sharma

Hip Specialist
Noida, India
19+ years of experience
Associate Director
WhatsAppWhatsApp Us
  • Dr. Sumit Bhushan Sharma is a well-known Orthopaedician & Joint Replacement Surgeon with experience of more than 15 years.
  • He is skilled in the treatment of Primary and Revision Joint Replacement, Complex and simple Trauma Surgeries, Hip and Knee Replacements, Pelvic-acetabular Surgeries, Lower Extremity Trauma, and Ilizarov Surgery.
  • Professionally, he is associated with Associate Member of AAOS, Medical Council of India, Delhi Medical Council, Indian Orthopaedic Association, and Jammu Medical Council.
  • Till date, he has performed more than 6,000 Joint Replacement Surgery.
  • He worked as Senior Registrar at Safdarjung Hospital New Delhi
Show more
  • Dr. Sumit Bhushan Sharma is a well-known Orthopaedician & Joint Replacement Surgeon with experience of more than 15 years.
  • He is skilled in the treatment of Primary and Revision Joint Replacement, Complex and simple Trauma Surgeries, Hip and Knee Replacements, Pelvic-acetabular Surgeries, Lower Extremity Trauma, and Ilizarov Surgery.
  • Professionally, he is associated with Associate Member of AAOS, Medical Council of India, Delhi Medical Council, Indian Orthopaedic Association, and Jammu Medical Council.
  • Till date, he has performed more than 6,000 Joint Replacement Surgery.
  • He worked as Senior Registrar at Safdarjung Hospital New Delhi

Get FREE Evaluation

Treatment plan and quote within 2 days

By submitting I agree to the Terms of Use and Privacy Policy of Vaidam Health.

Dr. Sunil Kumar Dash

Dr. Sunil Kumar Dash

Orthopaedic and Joint Replacement Surgeon
Bhubaneswar, India
19+ years of experience
Consultant
WhatsAppWhatsApp Us
  • Dr. Sunil Kumar Dash is a leading Orthopedic & Joint Replacement Surgeon with +16 years of experience.
  • He holds an MBBS degree from the Berhampur University (1997) and an MS degree from Utkal University, 2003.
  • Dr. Dash is a renowned joint replacement surgeon specialising in performing knee & hip replacement/deformity correction surgeries. He also treats, simple and complex fractures, sports injuries, pediatric bone problems, neck & back and joint pains.
Show more
  • Dr. Sunil Kumar Dash is a leading Orthopedic & Joint Replacement Surgeon with +16 years of experience.
  • He holds an MBBS degree from the Berhampur University (1997) and an MS degree from Utkal University, 2003.
  • Dr. Dash is a renowned joint replacement surgeon specialising in performing knee & hip replacement/deformity correction surgeries. He also treats, simple and complex fractures, sports injuries, pediatric bone problems, neck & back and joint pains.
Dr. Uma Chandran S

Dr. Uma Chandran S

Orthopaedic and Joint Replacement Surgeon
Chennai, India
54+ years of experience
Consultant
5.0 (55 Ratings)
WhatsAppWhatsApp Us
  • Dr. Uma Chandran S is an orthopedician and surgical joint surgeon specialist with 48+ years of experience.
  • He treats include Elbow Arthroscopy, Dislocation Repair, Lateral Epicondyle Release (Tennis Elbow), Fracture reduction and fixation, Osteotomy, Arthrolysis, Shoulder Replacement Surgery, and many more. 
  • He is a member of Indian Medical Association and Tamil Nadu Medical Council. 
  • He has completed MBBS from Madras University and FRCS from University of London.
  • Dr. Chandran holds expertise in surgery for Bone replacement, movement of spine, etc.
Show more
  • Dr. Uma Chandran S is an orthopedician and surgical joint surgeon specialist with 48+ years of experience.
  • He treats include Elbow Arthroscopy, Dislocation Repair, Lateral Epicondyle Release (Tennis Elbow), Fracture reduction and fixation, Osteotomy, Arthrolysis, Shoulder Replacement Surgery, and many more. 
  • He is a member of Indian Medical Association and Tamil Nadu Medical Council. 
  • He has completed MBBS from Madras University and FRCS from University of London.
  • Dr. Chandran holds expertise in surgery for Bone replacement, movement of spine, etc.
Dr. Vikash Kapoor

Dr. Vikash Kapoor

Arthroscopy and Sports Medicine
Kolkata, India
23+ years of experience
Director
5.0 (12 Ratings)
WhatsAppWhatsApp Us
  •  Dr. Vikash Kapoor is a leading and highly-skilled Orthopedic & Joint Replacement Surgeon with a practice of +20 years. 
  • He is a professional member of the Indian Arthroscopy Society as National Faculty.
  • Dr. Kapoor is a graduate of the Institute of Medical Sciences, Banaras Hindu University (IMS-BHU), 1995 and in 1996, he completed his MS degree. Thereafter he acquired many fellowships and training in Singapore, Australia, Italy and the USA among others.  
  • He has performed +5,000 THA and Total knee arthroplasty. Dr. Kapoor pioneered the first use of GMRS System for Proximal Tibia Replacement for recurrent GCT way back in 2005. 
  • In 2012, he performed the first bilateral Total Knee Replacement in Manipur. A year later, he conducted six live ACL Surgeries at TATA Main Hospital in Jamshedpur as faculty.
  • An extremely active medical professional, Dr. Kapoor has been invited as faculty at camps, workshops both in India and abroad.
  • Dr. Kapoor is an expert in joint replacement surgery, acl reconstruction, rotator cuff repair surgery, knee replacement, arthroscopic knee surgery, spine surgery among other treatments for orthopedic conditions. 
  • His scholarly contributions have been published in reputed medical journals.  
Show more
  •  Dr. Vikash Kapoor is a leading and highly-skilled Orthopedic & Joint Replacement Surgeon with a practice of +20 years. 
  • He is a professional member of the Indian Arthroscopy Society as National Faculty.
  • Dr. Kapoor is a graduate of the Institute of Medical Sciences, Banaras Hindu University (IMS-BHU), 1995 and in 1996, he completed his MS degree. Thereafter he acquired many fellowships and training in Singapore, Australia, Italy and the USA among others.  
  • He has performed +5,000 THA and Total knee arthroplasty. Dr. Kapoor pioneered the first use of GMRS System for Proximal Tibia Replacement for recurrent GCT way back in 2005. 
  • In 2012, he performed the first bilateral Total Knee Replacement in Manipur. A year later, he conducted six live ACL Surgeries at TATA Main Hospital in Jamshedpur as faculty.
  • An extremely active medical professional, Dr. Kapoor has been invited as faculty at camps, workshops both in India and abroad.
  • Dr. Kapoor is an expert in joint replacement surgery, acl reconstruction, rotator cuff repair surgery, knee replacement, arthroscopic knee surgery, spine surgery among other treatments for orthopedic conditions. 
  • His scholarly contributions have been published in reputed medical journals.  
Dr. Vinay Gupta

Dr. Vinay Gupta

Orthopaedic and Joint Replacement Surgeon
New Delhi, India
43+ years of experience
Consultant
WhatsAppWhatsApp Us
  • Dr. Vinay Gupta is a highly-experienced and skilled Orthopedic & Joint Replacement surgeon with +40 years of experience in the field.
  • His professional affiliations include, the Delhi Orthopedic Association and the Indian Orthopaedic Association.
  • He is a graduate of the G R Medical College, Gwalior (1976) and then did his MS in 1980.
  • Dr. Gupta is a specialised orthopedic and joint replacement surgeon with expertise to perform spinal, hip and major and elective emergency and trauma operations and fractures fixation.
  • He also offers orthopedic physiotherapy and physiotherapy for sports injury rehabilitation and spinal therapy.      
Show more
  • Dr. Vinay Gupta is a highly-experienced and skilled Orthopedic & Joint Replacement surgeon with +40 years of experience in the field.
  • His professional affiliations include, the Delhi Orthopedic Association and the Indian Orthopaedic Association.
  • He is a graduate of the G R Medical College, Gwalior (1976) and then did his MS in 1980.
  • Dr. Gupta is a specialised orthopedic and joint replacement surgeon with expertise to perform spinal, hip and major and elective emergency and trauma operations and fractures fixation.
  • He also offers orthopedic physiotherapy and physiotherapy for sports injury rehabilitation and spinal therapy.      
Dr. Vinod V. Rajan

Dr. Vinod V. Rajan

Orthopaedic and Joint Replacement Surgeon
Calicut, India
19+ years of experience
Senior Consultant
WhatsAppWhatsApp Us
  • Dr. Vinod V. Rajan is a renowned Orthopedic and Spine Surgeon with 16+ years of experience.
  • His interest lies in correcting spine deformities, complex spine surgeries, and minimally invasive surgeries.
  • He pursued his MBBS from Thrissur Medical College in 2000 followed by MS Ortho and D. Ortho from Government Medical College, Calicut in 2004.
  • Later, he completed his DNB in Orthopedics in 2005.
  • In 2009, he underwent Fellowship in Spine Surgery from Ganga Hospital, Coimbatore.
  • He has achieved AO Spine Fellowship from Queens Medical Centre, Nottingham in 2014.
  • In 2015, he attained a visiting fellowship in Spine Surgery from Cleveland Hospital, Florida.
  • He is the first spine surgeon to have performed over 1,000 spine surgeries from skull base to tail bone. 
Show more
  • Dr. Vinod V. Rajan is a renowned Orthopedic and Spine Surgeon with 16+ years of experience.
  • His interest lies in correcting spine deformities, complex spine surgeries, and minimally invasive surgeries.
  • He pursued his MBBS from Thrissur Medical College in 2000 followed by MS Ortho and D. Ortho from Government Medical College, Calicut in 2004.
  • Later, he completed his DNB in Orthopedics in 2005.
  • In 2009, he underwent Fellowship in Spine Surgery from Ganga Hospital, Coimbatore.
  • He has achieved AO Spine Fellowship from Queens Medical Centre, Nottingham in 2014.
  • In 2015, he attained a visiting fellowship in Spine Surgery from Cleveland Hospital, Florida.
  • He is the first spine surgeon to have performed over 1,000 spine surgeries from skull base to tail bone. 
Dr V G Rajan

Dr V G Rajan

Arthroscopy and Sports Medicine
Bangalore, India
28+ years of experience
Consultant
WhatsAppWhatsApp Us
  • Dr. V G Rajan is an orthopedist who specializes in knee surgery. He has been working in Bangalore since 2013, after returning from the United Kingdom.
  • Total Knee/Hip Replacement, Sports Injury-minimally invasive keyhole surgery, Cartilage, Meniscus Surgery, Trauma Surgery, Patella- Femoral Alignment Surgery, Partial Knee Replacement, Arthroscopy ACL Reconstruction, Cartilage Removal and Repair, Simple and Complex Ligament Repair and Reconstruction are among the treatments provided by Dr. V G Rajan.
  • During his time in the UK, he received fellowship training in arthroscopic knee cartilage surgery, ligament restoration, and all sorts of knee replacement surgery, in addition to successfully completing his FRCS Trauma & Orthopaedic training.
  • Dr. V G Rajan has continued to develop experience in specialist knee surgery, publishing multiple scientific publications in peer-reviewed international journals and teaching on surgical skills courses and training programmes in our country and abroad.
  • Dr. Rajan received Membership of the Royal College of Surgeons of Edinburgh (MRCS) in 2006 and Fellowship of the Royal College of Surgeons of Edinburgh in Trauma and Orthopedic Surgery (FRCS Orth) in 2012.
  • He is a member of the Karnataka Medical Council, the General Medical Council of the United Kingdom, the Karnataka Orthopaedic Association, and the Indian Society of Hip and Knee Surgeons.
  • He has multiple scientific articles in international peer-reviewed journals.
  • He can communicate in languages like English, Hindi, Kannada, Telugu and Tamil.
Show more
  • Dr. V G Rajan is an orthopedist who specializes in knee surgery. He has been working in Bangalore since 2013, after returning from the United Kingdom.
  • Total Knee/Hip Replacement, Sports Injury-minimally invasive keyhole surgery, Cartilage, Meniscus Surgery, Trauma Surgery, Patella- Femoral Alignment Surgery, Partial Knee Replacement, Arthroscopy ACL Reconstruction, Cartilage Removal and Repair, Simple and Complex Ligament Repair and Reconstruction are among the treatments provided by Dr. V G Rajan.
  • During his time in the UK, he received fellowship training in arthroscopic knee cartilage surgery, ligament restoration, and all sorts of knee replacement surgery, in addition to successfully completing his FRCS Trauma & Orthopaedic training.
  • Dr. V G Rajan has continued to develop experience in specialist knee surgery, publishing multiple scientific publications in peer-reviewed international journals and teaching on surgical skills courses and training programmes in our country and abroad.
  • Dr. Rajan received Membership of the Royal College of Surgeons of Edinburgh (MRCS) in 2006 and Fellowship of the Royal College of Surgeons of Edinburgh in Trauma and Orthopedic Surgery (FRCS Orth) in 2012.
  • He is a member of the Karnataka Medical Council, the General Medical Council of the United Kingdom, the Karnataka Orthopaedic Association, and the Indian Society of Hip and Knee Surgeons.
  • He has multiple scientific articles in international peer-reviewed journals.
  • He can communicate in languages like English, Hindi, Kannada, Telugu and Tamil.
Dr. Joydeep Banerjee Chowdhury

Dr. Joydeep Banerjee Chowdhury

Orthopaedic and Joint Replacement Surgeon
Kolkata, India
32+ years of experience
Principal Consultant
WhatsAppWhatsApp Us
  • Dr. Joydeep Banerjee Chowdhury is a renowned Orthopedic Surgeon, based in Kolkata with extensive 28+ years of experience.
  • His expertise lies in Hip replacement surgeries, knee replacement surgeries, knee arthroscopy, ACL reconstruction, shoulder surgery, and in the management of Osteoarthritis, Rheumatoid Arthritis, Cubital Tunnel Syndrome, Tennis Elbow, Ligament Injuries to the Knee, etc.
  • Dr. Banerjee is a member of the American Academy of Orthopaedic Surgeons, Indian Medical Association, Indian Orthopedic Association, West Bengal Medical Council, etc. He has successfully operated over 400+ joint replacement surgeries with minimal complications.
  • Under his credit, there are both national and international publications and he is actively invited as a guest speaker in scientific meetings, CME's, worldwide conferences to talk about Orthopedic Surgeries.
Show more
  • Dr. Joydeep Banerjee Chowdhury is a renowned Orthopedic Surgeon, based in Kolkata with extensive 28+ years of experience.
  • His expertise lies in Hip replacement surgeries, knee replacement surgeries, knee arthroscopy, ACL reconstruction, shoulder surgery, and in the management of Osteoarthritis, Rheumatoid Arthritis, Cubital Tunnel Syndrome, Tennis Elbow, Ligament Injuries to the Knee, etc.
  • Dr. Banerjee is a member of the American Academy of Orthopaedic Surgeons, Indian Medical Association, Indian Orthopedic Association, West Bengal Medical Council, etc. He has successfully operated over 400+ joint replacement surgeries with minimal complications.
  • Under his credit, there are both national and international publications and he is actively invited as a guest speaker in scientific meetings, CME's, worldwide conferences to talk about Orthopedic Surgeries.
Dr. Ajay Rathod

Dr. Ajay Rathod

Hip Specialist
Mumbai, India
22+ years of experience
Consultant
WhatsAppWhatsApp Us
  • Dr. Ajay Rathod is a reputed and skilled Orthopedic & Joint Replacement Surgeon with a practice of +19 years.
  • He is a professional member of many medical societies. Some of them are, the Association of Medical Consultant (AMC), the Association of Bombay Orthopaedic Surgeon (BOS), the Indian Orthopaedic Association, the Indian Society of Hip & Knee Surgeon, Indian Arthroscopy Society and the American Academy of Orthopedic Surgeons (AAOS). 
  • He completed his MBBS from Bombay University in 1995 and Masters in Orthopedics from Bombay University in 1999.
  • Dr. Rathod is an expert orthopedic surgeon, specialised to perform, primary/revision joint replacement surgeries, computer-assisted joint replacement surgeries and fracture surgeries. He also treats, back (spine) problems, nerve diseases, knee pain, neck (cervical) problems, hip fractures, knee arthritis, shoulder problems, treatment of sports-related injury, joint fractures, neuromuscular disorders, dislocations, neck and spine problems. 
  • He is recognised for pioneering the VEGA Posterior Stabilised Knee Replacement Implant Technology in 2012.
  • Dr. Rathod has participated in trainings and conferences in Australia, South Korea and the USA as attendee or faculty. 
Show more
  • Dr. Ajay Rathod is a reputed and skilled Orthopedic & Joint Replacement Surgeon with a practice of +19 years.
  • He is a professional member of many medical societies. Some of them are, the Association of Medical Consultant (AMC), the Association of Bombay Orthopaedic Surgeon (BOS), the Indian Orthopaedic Association, the Indian Society of Hip & Knee Surgeon, Indian Arthroscopy Society and the American Academy of Orthopedic Surgeons (AAOS). 
  • He completed his MBBS from Bombay University in 1995 and Masters in Orthopedics from Bombay University in 1999.
  • Dr. Rathod is an expert orthopedic surgeon, specialised to perform, primary/revision joint replacement surgeries, computer-assisted joint replacement surgeries and fracture surgeries. He also treats, back (spine) problems, nerve diseases, knee pain, neck (cervical) problems, hip fractures, knee arthritis, shoulder problems, treatment of sports-related injury, joint fractures, neuromuscular disorders, dislocations, neck and spine problems. 
  • He is recognised for pioneering the VEGA Posterior Stabilised Knee Replacement Implant Technology in 2012.
  • Dr. Rathod has participated in trainings and conferences in Australia, South Korea and the USA as attendee or faculty. 

Showing 145–156 of 995 doctors

Get FREE Evaluation

Treatment plan and quote within 2 days

By submitting I agree to the Terms of Use and Privacy Policy of Vaidam Health.

Data Privacy Guaranteed
Your information is secure
24/7 Patient Support
Get assistance anytime

Reviews from patients

MP
Mr. Pravin Kumar Jiva
Fiji→India·November 2024

“I came to New Delhi for orthopaedic treatment & Vaidam handled everything from airport pickup to hospital appointments and all post-surgery care. I highly recommend Vaidam!”

Verified treatment
MG
Mr. George Tellez
United States→India·August 2024

“I needed knee attention, so I contacted Vaidam Health and received the proper help. I'm making progress, despite the challenges. Huge thanks to Vaidam team.”

Verified treatment
MR
Ms. Rozeda
Mauritius→India·August 2023

“I chose Dr. IPS Oberoi at Artemis Hospital for my mother’s knee replacement. Vaidam staff met me at the airport and handled all the hospital's administrative tasks for us.”

Verified treatment

Case Study of Our Patients

Dr. Nishtha Kalra
This content meets the Vaidam Editorial Policy and is medically reviewed by

With over 12 years of experience, excels as a medical content reviewer. Holding a Bachelor's in Dentistry and a Master's in Healthcare Administration, she bridges intricate medical concepts and the broader audience. Her expertise includes simplifying complex data, ensuring precise content, and conveying medical concepts clearly.

Need Assistance?Chat