How OA Progresses — and Why Timing Matters

Part of The Joint Replacement Guide — Phase 1: Understanding Your Condition · Article 4 of 44 · Hip & Knee

Key Points

  • Osteoarthritis does not follow the same course in everyone. Symptoms may remain stable, fluctuate or gradually become more troublesome.
  • An X-ray cannot reliably predict how quickly symptoms will change.
  • Joint replacement is not required simply because osteoarthritis is visible on an X-ray.
  • Referral may be appropriate when pain, stiffness, reduced mobility or deformity substantially affects quality of life and suitable non-surgical treatment has not helped enough or is unsuitable.
  • There is no single “correct” level of pain or disability at which everyone should have surgery.
  • The decision should be made jointly with the surgical team after considering symptoms, function, health, treatment preferences, potential benefits and risks, and the option of not having surgery.

Osteoarthritis Does Not Always Progress in a Straight Line

A common question is: “How quickly will this get worse?”

There is no reliable answer for an individual person. Some people have symptoms that remain relatively stable for years. Others experience periods when symptoms become worse, followed by improvement, while some notice a more consistent decline.

Factors such as previous joint injury, joint alignment, body weight and the extent of structural change may be associated with progression. However, they cannot predict with certainty what will happen to one person or when surgery might become appropriate.

Symptoms and X-ray changes can also behave differently. An X-ray may worsen without a comparable increase in pain, while significant symptoms can occur despite less marked structural change. Decisions should therefore be based on the whole clinical picture rather than imaging alone.[1]

Why Maintaining Movement Matters

Pain can make people less inclined or less able to move. Over time, reduced activity may contribute to:

  • loss of muscle strength
  • reduced confidence when walking
  • increasing stiffness
  • poorer balance or general fitness
  • difficulty with everyday activities
  • disturbed sleep or lower mood

These changes are not inevitable, and experiencing them does not mean that someone has failed to manage their condition.

Tailored therapeutic exercise can help maintain strength and function. Activities may need to be adapted during painful periods, and some people benefit from support from a physiotherapist or another appropriately qualified healthcare professional.[1]

Pain should not simply be ignored until it becomes unbearable. If symptoms are becoming harder to manage, it is reasonable to ask for a review of the diagnosis and treatment plan.

Does Waiting Make Surgery Less Successful?

The answer is not straightforward.

People waiting for hip or knee replacement may experience worsening pain, function or quality of life, particularly during prolonged waits. However, current research has not clearly established that a longer wait inevitably produces a worse result after surgery.[5]

Severe stiffness, substantial deformity or bone loss can sometimes make an operation more technically complex. Poor muscle strength or reduced general fitness may also influence recovery. These factors are considered during the surgical assessment, but they do not mean that successful treatment is impossible.

Surgeons regularly treat people with advanced or longstanding osteoarthritis. The presence of severe disease should not be used to imply that a patient has “left it too late.”

If your symptoms or mobility change significantly while you are waiting for treatment, contact the clinical team responsible for your care. They may need to review your condition or help you manage the waiting period.

Why Surgery Is Not Usually the First Step

Joint replacement can provide substantial improvements in pain and function for appropriately selected patients, but it is a major operation and does not guarantee a particular result.

Potential disadvantages include complications, a period of rehabilitation, persistent symptoms in some patients and the possibility of further surgery in the future. Artificial joints are designed to last for many years, but no implant can be guaranteed to last for life.[2,4]

Before referral, people should usually have been offered appropriate non-surgical care, including information, tailored therapeutic exercise, weight-management support where relevant, and suitable pain treatment. NICE recommends considering referral when:

  • symptoms such as pain, stiffness, reduced function or progressive deformity are having a substantial effect on quality of life; and
  • appropriate non-surgical management has been ineffective or is unsuitable.[1]

This does not mean that every possible treatment must be “exhausted.” Some treatments may be unsuitable, unsafe, unacceptable to the patient or unlikely to help. Referral should be based on an individual clinical assessment rather than a rigid checklist or numerical score.[1]

How the Timing Decision Is Made

There is no universal pain score, X-ray grade or walking distance that determines when surgery should take place.

A discussion about joint replacement may consider:

  • the severity and frequency of pain
  • mobility and ability to carry out everyday activities
  • sleep, work, caring responsibilities and social participation
  • stiffness, deformity or loss of movement
  • the effect of symptoms on emotional wellbeing
  • which non-surgical treatments have been tried and how helpful they were
  • general health and individual surgical risks
  • expected benefits and limitations
  • the possibility of further surgery during the person’s lifetime
  • the person’s priorities, concerns and willingness to undergo surgery and rehabilitation

After receiving balanced information, a person may choose surgery, decide against it or defer the decision and review it later. Those are all valid options. Consent to surgery can also be withdrawn before the procedure.[2]

What Research About Preoperative Function Shows

Patient-reported outcome measures are questionnaires used to assess pain, function and quality of life before and after joint replacement.

Research suggests that people with worse function before surgery often experience a larger improvement because they start from a lower level. However, on average, their final level of function may remain lower than that of people who had better function before surgery.[6]

This is an association and does not prove that operating earlier would necessarily have produced a better result for a particular patient. Outcomes are influenced by many factors, and the available research does not identify one optimal time that applies to everyone.

These findings are best used to support an individual discussion—not to pressure someone into surgery or imply that a limited opportunity will suddenly be lost.

A Practical Approach

Consider asking for a clinical review if:

  • pain or stiffness is becoming more difficult to manage
  • walking or everyday activities are increasingly restricted
  • symptoms regularly disturb sleep
  • the joint is becoming progressively more deformed
  • non-surgical treatment is no longer providing enough relief
  • you want to understand whether referral for a surgical opinion would be reasonable

A referral does not commit you to an operation. It provides an opportunity to discuss the diagnosis, available options, likely benefits, limitations and individual risks.

When to Seek More Urgent Help

Osteoarthritis usually changes gradually. Seek urgent medical advice if:

  • a joint suddenly becomes hot, markedly swollen or changes colour
  • severe pain develops suddenly without an obvious explanation
  • you have joint pain together with fever, shivering or feeling generally unwell
  • you suddenly cannot put weight through the leg
  • symptoms follow a significant fall or injury

These features are not typical of gradual osteoarthritis and may indicate another problem requiring prompt assessment.

Important Information

This article provides general educational information. It cannot predict how an individual’s osteoarthritis will progress or determine when surgery is appropriate. It does not replace assessment and advice from an appropriately qualified healthcare professional.

The potential benefits and risks of joint replacement vary between individuals. No outcome, recovery time or implant lifespan can be guaranteed.

References

  1. National Institute for Health and Care Excellence. Osteoarthritis in over 16s: diagnosis and management. NICE guideline NG226. Published 19 October 2022. Available from: https://www.nice.org.uk/guidance/ng226 [Accessed 14 August 2026].
  2. National Institute for Health and Care Excellence. Joint replacement (primary): hip, knee and shoulder. NICE guideline NG157. Published 4 June 2020. Available from: https://www.nice.org.uk/guidance/ng157 [Accessed 14 August 2026].
  3. Versus Arthritis. Osteoarthritis (OA): causes, symptoms and treatments. Available from: https://www.versusarthritis.org/about-arthritis/conditions/osteoarthritis/ [Accessed 14 August 2026].
  4. National Joint Registry. The National Joint Registry 22nd Annual Report 2025: outcomes after joint replacement, 2003 to 2024. Available from: https://www.ncbi.nlm.nih.gov/books/NBK618761/ [Accessed 14 August 2026].
  5. Cooper GM, Bayram JM, Clement ND. The functional and psychological impact of delayed hip and knee arthroplasty: a systematic review and meta-analysis of 89,996 patients. Sci Rep. 2024;14:8032. doi: https://doi.org/10.1038/s41598-024-58050-6
  6. Hofstede SN, Gademan MGJ, Stijnen T, Nelissen RGHH, Marang-van de Mheen PJ. The influence of preoperative determinants on quality of life, functioning and pain after total knee and hip replacement: a pooled analysis of Dutch cohorts. BMC Musculoskelet Disord. 2018;19:68. doi: https://doi.org/10.1186/s12891-018-1991-0

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