Is There an Age Limit for Joint Replacement? Who Qualifies

There is no upper age limit for joint replacement. Dr. Subhash Jangid, currently Principal Director & Unit Head Orthopaedics, Fortis Memorial Research Institute, Gurgaon, India, judges candidates by physiological age, medical fitness and the damage in the joint, not by birth date. Hip replacement can be considered once the skeleton has matured, partial knee replacement from about 40, and a fit 80-year-old remains a candidate.

This article sets out how Dr. Jangid decides who needs a knee or hip replacement, when to operate, when a partial knee is the better operation, and when surgery should be delayed or avoided altogether. The broader picture of implants, robotics and rehabilitation is in the pillar guide, recent advances in joint replacement, and his background is on the Dr. Subhash Jangid doctor page.

Is there an age limit for joint replacement?

Dr. Jangid's answer, given to doctors on the call, is no. Modern implants are durable, with about 90% of knee replacements still in place at 20 years, so age alone is not a reason to refuse surgery. The lower bound depends on the joint:

• Hip replacement is usually performed any time after skeletal maturity if the joint is badly damaged.
• Partial knee replacement can be performed after about 40, occasionally as early as 30, although most patients present after 45 or 50.
• Choosing between partial and total knee replacement at that point depends on how much of the joint is damaged, not on the patient's age.

Joint replacement in elderly patients

At the other end of life, a doctor on the call asked whether an 80-year-old with a knee fracture could still be a candidate. Dr. Jangid's reply was unequivocal: yes. "Age is just a number." What matters is whether the patient is medically fit and physiologically active enough to undergo surgery. If they are, surgery should be considered, because no one should be denied treatment on age alone. The full exchange is in the Live Discussion for this masterclass.

Physiological age, not chronological age

When Dr. Jangid speaks of "young" patients, he means physiological age. He illustrated the point with a well-known Indian film star approaching 80 who, in his view, still works longer and harder than his son of around 50. The implication for implant choice is significant. A patient of 60 or 70 who is medically fit may live to 100, so he gives that patient the best available implant, one designed to last the next 30 years.

Matching the operation to the patient's life

Age is not the only variable. Dr. Jangid contrasted two young men. One has a desk job: he attends meetings, walks around the office and needs to lead a normal life. A hip replacement suits him. The other earns his living pulling a heavy cart. Dr. Jangid would probably not offer him a replacement at that age, because his work places a heavy load on the joint, and after a replacement he might not be able to continue the job that is his livelihood.

The principle is that treatment is chosen according to the patient's profile: occupation, activity level and the demands the joint will face, alongside the X-ray.

Who needs a knee or hip replacement: signs and symptoms

Dr. Jangid listed the symptoms and findings that indicate a patient needs surgery:

• Pain not controlled by medication, or pain that requires painkillers every day. Daily painkillers can damage the stomach and kidneys, and few people want to take a pill every day for the rest of their lives.
• Deformity, when the knee bends inwards or outwards. In patients from Africa he most often sees knock knees (valgus deformity) rather than bow legs (varus deformity).
• Crepitus, a grating sound or sensation from the joint on movement.
• Tenderness, where the knee hurts to touch.
• Instability, a feeling that the knee gives way, with difficulty walking and a tendency to fall.
• Limitation of daily activities, when the patient cannot perform the routine tasks needed to get through the day.
• Uncontrolled comorbidities, such as hypertension or diabetes that cannot be controlled because pain prevents the patient from walking and exercising as their doctor advises.
• Previous trauma, where an old fracture healed out of alignment (malunion) and has gradually damaged the joint.

He added a diagnostic caution for referring doctors: in a patient with knee pain, examine the hip and the spine as well, because the pain sometimes originates there.

Indications: conditions that lead to joint replacement

Osteoarthritis, the wear-related degeneration of the joint that comes with age, is the most common indication. Dr. Jangid listed several others:

• Inflammatory arthritis, a systemic disease such as rheumatoid arthritis that affects the major joints and the small joints of the hands.
• Post-traumatic arthritis, where an old injury has damaged the joint.
• Ankylosing spondylitis, an inflammatory disease that affects the spine and also damages large joints such as the hip and knee.
• Childhood septic arthritis, an infection of the hip in childhood that damages the joint and leads to a replacement later in life.
• Disease of the joint lining (synovium) that gradually produces multiple loose bodies inside the joint and damages it.
• A large cartilage defect at an early stage, where the rest of the joint is still healthy. These patients, he said, are very happy with a partial replacement.

When to operate: how knee arthritis progresses on X-ray

On X-ray, knee osteoarthritis follows a recognisable course. In a normal knee the joint space is preserved. As the disease advances, the space on the inner side of the joint narrows, until the bones touch: "bone to bone". At that point the cartilage between the bones is completely worn out, and Dr. Jangid's view is that the patient needs some form of surgical intervention.

Beyond that stage the damage compounds. The rubbing bones form extra bone (osteophytes), the joint begins to sublux so that the femur and tibia no longer sit in line, and in very advanced cases the bones have shifted so far that the knee is barely recognisable as a knee on X-ray. All of these can still be treated with very good results, Dr. Jangid said, but the sooner the patient comes, the better the result.

Partial vs total knee replacement

A partial knee replacement resurfaces only the damaged half of the knee, typically the inner (medial) compartment, and leaves the other half and its natural structure intact. Dr. Jangid identified partially worn joints in patients aged 45 to 55 as one of the newer challenges in arthroplasty practice. He noted that 55 is now considered young, and 70 the threshold of the elderly patient.

His strategy for these patients is to perform a partial replacement first, so that a total knee replacement is needed, if at all, only after 70. Pooled registry data put survival of partial knee replacements at about 70% at 25 years. Robotic planning allows the partial implant to be balanced precisely against the healthy half of the knee, as described in severe knee deformity correction with robotic surgery. Indicative prices for the full operation are on the total knee replacement cost page.

Failed old implants and revision

The second new challenge Dr. Jangid described is the failed joint replacement. Many implants placed years ago with older designs lasted no more than 10 to 15 years, and as they failed they caused considerable bone damage. Where the bone loss is significant, he uses a customised implant, which he said is available in India at a very reasonable cost and allows a quick recovery.

Contraindications: when joint replacement should be delayed or avoided

Dr. Jangid set out four situations in which a replacement should not be performed, or not yet.

Active infection

An infected joint must not be replaced until the infection is controlled. Referring doctors sometimes send a patient with an infected joint for replacement. That does not mean the patient will never have the operation: the surgeon first clears the infection and places an antibiotic spacer in the joint for about six weeks, and the replacement follows once the infection is controlled.

Neurological and neuromuscular disorders

Some patients walk awkwardly not because of pain but because their neuromuscular control is impaired and they cannot balance. A new joint does not correct that imbalance, and these patients are not the right candidates for joint replacement.

Previous flap or graft over the joint

After old trauma, the skin over the joint may have been reconstructed with a flap or skin graft. Dr. Jangid regards these patients, too, as poor candidates for replacement.

Neuropathic joints

In a neuropathic (Charcot) joint, nerve damage removes the sensation of pain, and the joint and surrounding tissues are badly damaged, so that on X-ray the joint is barely recognisable. Dr. Jangid does not normally offer these patients surgery. Where instability prevents the patient from walking, he will consider a revision-type implant that provides more stability, but he is very cautious in doing so.

Knee replacement or bariatric surgery first?

Severe obesity raises a sequencing question: should the patient lose weight through bariatric surgery before a knee replacement, or the reverse? Dr. Jangid's answer depends on mobility. When a patient can barely walk to the washroom, the knee becomes the priority, and bariatric surgery can follow after the knee replacement. He described a woman from West Africa weighing 130 kg who was walking without a walker or stick within three weeks of her knee replacement.

Joint replacement candidates at a glance

Other orthopaedic masterclasses are collected under the orthopaedics specialty. Patients and doctors comparing other perspectives can read Dr. Rohit Lamba on when hip replacement is needed, and Dr. Mannu Bhatia on joint replacement for arthritis.