What Are the Signs I Might Need a Knee Replacement?

Advice from Dr Oliver Khoo, Orthopaedic Surgeon

Dr Oliver Khoo has been an orthopaedic surgeon since 2011, specialising in hip and knee surgery, including knee replacements for patients with arthritis, joint degeneration, and injuries. He understands that deciding to have surgery can be daunting, and many patients wonder whether their knee pain is severe enough to warrant a knee replacement.

If you’re experiencing persistent pain, stiffness, or difficulty with daily activities, this guide will help you understand when to consider surgery, when non-surgical options may still be effective, and what to expect from knee replacement surgery.

Key Signs You Might Need a Knee Replacement

Knee pain can develop gradually or worsen over time, making it difficult to know when surgery might be the right option. While some discomfort can be managed with physiotherapy or medication, persistent pain, stiffness, and mobility issues may indicate that the joint is significantly damaged. If your symptoms are interfering with daily activities and non-surgical treatments are no longer effective, it may be time to consider a knee replacement. Here are some key signs that surgery could be the best path forward.

1. Persistent Pain That Doesn’t Improve with Treatment

Knee pain that lasts for months or years, even with rest, medication, or physiotherapy, may indicate significant joint damage. If you need regular painkillers or your pain worsens at night or during rest, it could be time to consider a knee replacement.

2. Stiffness and Loss of Mobility

If your knee feels constantly stiff, especially in the morning or after sitting for long periods, and you struggle to fully bend or straighten your leg, this may indicate advanced arthritis. Difficulty with everyday activities like walking, climbing stairs, or getting in and out of chairs is a red flag.

3. Chronic Swelling and Inflammation

Occasional swelling can happen with injuries, but if your knee remains swollen despite treatment, it may suggest ongoing joint deterioration.

4. Knee Deformity or Instability

If your knee looks bowed or knock-kneed or feels unstable, you may have severe cartilage loss or ligament damage, making surgery a likely option.

5. Your Quality of Life Is Affected

When knee pain stops you from doing the things you love—such as walking, exercising, or playing with family—it’s worth discussing surgical options.

When to Try Non-Surgical Options First

Before considering surgery, many patients try non-surgical treatments, including:

Physiotherapy – Strengthening muscles to support the knee
Weight Management – Reducing excess stress on the joint
Pain Management – Medications, steroid injections, or hyaluronic acid injections
Braces & Walking Aids – Reducing knee strain

For some patients, these treatments provide lasting relief. However, if symptoms persist despite trying multiple non-surgical options, surgery may be the best solution.

When to Consider Knee Replacement Surgery

You may be a good candidate for knee replacement if:

Pain is severe and constant, even at rest
Walking, climbing stairs, or standing for long periods is very difficult
Your knee is unstable or deformed
Non-surgical treatments no longer help

Knee replacement surgery is highly successful, with modern techniques providing long-term pain relief and improved mobility.

What to Expect After Knee Replacement Surgery

Hospital Stay and Recovery – Most patients stay in hospital for one to three days and begin walking with assistance soon after surgery.

Rehabilitation – Physiotherapy is key to regaining movement and strength, with most patients resuming normal activities within six to twelve weeks.

Long-Term Benefits – Knee replacements typically last 15 to 20 years or more, providing significant pain relief and better mobility.

Book a Consultation with Dr Oliver Khoo

If knee pain is impacting your daily life and you’re unsure about your treatment options, Dr Oliver Khoo offers consultations in both Sydney and Griffith.

Sydney - Consulting Suites

Suite 901A, St Vincent’s Clinic

438 Victoria Street, Darlinghurst NSW 2010

(02) 9357 7850 | (02) 4044 0101

Griffith - Consulting Suites

St Vincent’s Private Community Hospital Consulting Suites

41-45 Animoo Avenue, Griffith NSW 2680