Joint Replacement Surgery: When Is It Time?

What conditions most often lead to joint replacement?

The most common reason for knee or hip replacement is end-stage osteoarthritis — the gradual wearing down of cartilage that cushions the joint. Less common causes include inflammatory arthritis (rheumatoid or psoriatic), post-traumatic arthritis from old injuries, osteonecrosis (bone death from poor blood supply), and significant fractures near the joint.

Osteoarthritis progresses at different rates in different people. Some live well for years with a bone-on-bone X-ray and manageable symptoms; others have severe pain with only moderate radiographic changes. The X-ray alone does not determine whether you need surgery — your symptoms and functional limitations matter as much as the imaging.

What do orthopedic surgeons look for before recommending replacement?

The American Academy of Orthopaedic Surgeons (AAOS) and the Osteoarthritis Research Society International (OARSI) both emphasize a step-wise approach before surgery is considered 1Ref 1Brophy RH, Fillingham YA (2022).AAOS Clinical Practice Guideline Summary: Management of Osteoarthritis of the Knee (Nonarthroplasty), Third Edition.AAOS step-wise criteria for knee OA management and indications for surgical consideration2Ref 2Bannuru RR, Osani MC, Vaysbrot EE, et al. (2019).OARSI guidelines for the non-surgical management of knee, hip, and polyarticular osteoarthritis.OARSI step-wise non-surgical approach before considering joint replacement. Surgeons typically look for:

1. Severity of symptoms: Pain that disrupts sleep, limits walking to short distances, prevents basic activities like climbing stairs, bathing, or dressing. 2. Duration: Symptoms that have persisted despite consistent non-surgical treatment for generally six months or more. 3. Documented joint damage on imaging: X-rays showing significant joint space narrowing, bone spurs, or subchondral bone changes. 4. Failure of non-surgical treatments: Physical therapy, weight management, oral pain medications, knee bracing, and injections have been tried and provided insufficient relief. 5. Patient goals and overall health: Surgical risk, body weight, smoking status, cardiovascular health, and the patient's own priorities all factor into the shared decision.

What should I try before surgery?

Guidelines consistently support non-surgical management as the appropriate starting point for most patients with knee or hip osteoarthritis 1Ref 1Brophy RH, Fillingham YA (2022).AAOS Clinical Practice Guideline Summary: Management of Osteoarthritis of the Knee (Nonarthroplasty), Third Edition.AAOS step-wise criteria for knee OA management and indications for surgical consideration2Ref 2Bannuru RR, Osani MC, Vaysbrot EE, et al. (2019).OARSI guidelines for the non-surgical management of knee, hip, and polyarticular osteoarthritis.OARSI step-wise non-surgical approach before considering joint replacement3Ref 3Fransen M, McConnell S, Harmer AR, Van der Esch M, Simic M, Bennell KL (2015).Exercise for osteoarthritis of the knee.Land-based exercise produces meaningful improvements in pain and function for knee osteoarthritis:

• Exercise and physical therapy: The single most consistently recommended intervention. Strengthening the muscles around the joint reduces load and pain. A Cochrane review found land-based exercise produces meaningful short-term improvements in pain and physical function for knee osteoarthritis 3Ref 3Fransen M, McConnell S, Harmer AR, Van der Esch M, Simic M, Bennell KL (2015).Exercise for osteoarthritis of the knee.Land-based exercise produces meaningful improvements in pain and function for knee osteoarthritis.
• Weight management: Each pound of body weight translates to roughly four pounds of force across the knee joint with walking. Reducing weight, when possible, meaningfully reduces joint load.
• Walking aids and bracing: Canes and unloader braces can shift load away from the most damaged part of the joint.
• Oral medications: Acetaminophen and NSAIDs (used with appropriate caution) are first-line pharmacological options.
• Intra-articular injections: Corticosteroid injections can provide several weeks of meaningful pain relief. Hyaluronic acid injections have a more debated evidence base — the AAOS guideline offers a cautious recommendation on their use.
• Topical NSAIDs: Particularly for knee osteoarthritis, topical diclofenac provides pain relief with less systemic exposure than oral NSAIDs.

Are there signs that surgery is the right next step?

Several clinical patterns suggest that conservative treatment has reached its limits and surgery is worth a serious conversation with an orthopedic surgeon:

• Pain at rest or that wakes you from sleep regularly
• Significant difficulty with basic self-care activities (bathing, dressing)
• Walking tolerance reduced to a block or less despite using aids
• Recurring falls related to joint giving-way
• Consistent failure of multiple conservative treatments including at least several months of structured physical therapy
• Severe or rapidly progressive joint damage on imaging combined with significant symptoms

Age alone is not a criterion in either direction. Younger patients have joint replacements when necessary, and older patients in good health have successful outcomes. The decision is individualized.

What does the surgery itself involve?

In total knee or hip arthroplasty, the damaged joint surfaces are resurfaced with metal and plastic components. Most procedures take one to two hours. Hospital stay is typically one to two days, with discharge often on the same day in high-volume centers.

Modern implants have good long-term durability — most patients can expect a well-functioning implant for fifteen to twenty years or more, though this depends on activity level, body weight, and individual factors. Surgeons weigh implant longevity against patient age, which is one reason younger patients with less severe disease are sometimes encouraged to continue conservative management longer.

An orthopedic surgeon is the specialist who evaluates for and performs joint replacement. Gale can help you prepare questions for an orthopedic consultation and discuss what to expect from the process.