Knee Conditions

Knee conditions are one of the most common reasons people in Sydney seek medical attention from local GPs and physiotherapists to orthopaedic specialists. Whether you’ve had a sports injury, noticed stiffness during your Bondi to Coogee walk, or are dealing with long-standing discomfort, understanding what’s going on in your knee is the first step toward getting the right care.

This page introduces the most common knee conditions seen in Sydney clinics and hospitals. Each section links to a detailed guide that covers symptoms, causes, diagnosis, and treatment options. If you’re unsure about your symptoms, speak with your orthopaedic knee surgeon for an individualised assessment.

Common Knee Conditions That May Affect You

The knee joint is a complex structure made up of bones, ligaments, cartilage, and soft tissue. Pain or loss of function can come from any one of these parts, or a combination of them.

Recognising patterns in your symptoms can help clinicians narrow down what’s going on and whether treatment is needed.

Knee Arthritis

Knee arthritis, especially osteoarthritis, is one of the most common sources of persistent joint pain in older adults. It tends to develop gradually and may cause stiffness after sitting, discomfort with activity, or swelling around the joint.

In some cases, arthritis can also reduce joint stability or change how your knee moves during walking.

If symptoms progress despite conservative care, options like partial knee replacement, total knee replacement, or robotic-assisted surgery may be explored.

More on knee arthritis →

Meniscus Tear

Meniscus tears affect the cartilage pads that cushion your knee and are common after a twisting injury or awkward squat. Symptoms may include sharp pain, catching, swelling, or the feeling of something "blocking" the joint.

Tears can also occur gradually with age or joint wear, even without a major injury.

Depending on the severity, a knee arthroscopy may be considered to remove or repair the affected tissue.

More on meniscus tears →

Ligament Injuries

Ligaments like the ACL, MCL, and PCL are crucial for knee stability. These can be stretched or torn during high-impact activities or sudden direction changes, such as in contact sports or trail running.

Without adequate support or healing, ligament injuries may lead to long-term instability or difficulty returning to sport.

Treatment may involve rehabilitation or, in more severe cases, knee reconstruction surgery to restore stability.

More on ligament injuries →

Knee Instability

Knee instability often feels like the joint is loose, weak, or at risk of giving way, particularly on stairs or uneven ground. It may result from previous injuries, muscle imbalance, or soft tissue laxity.

Repeated episodes of instability can increase the risk of further damage to the joint’s cartilage or meniscus.

Management might include physiotherapy or, when needed, ligament reconstruction to restore joint control.

More on knee instability →

Patellofemoral Pain Syndrome (PFPS)

Patellofemoral Pain Syndrome (PFPS) causes pain at the front of the knee, often around or behind the kneecap. It’s especially common in young adults, runners, and people who sit for long periods.

Muscle imbalance, joint alignment, and biomechanics often play a role in its development.

Most cases improve with guided rehabilitation, but arthroscopy may be discussed if pain is persistent and linked to structural changes.

More on patellofemoral pain →

Knee Pain in Young Adults

Young adults can experience knee pain from overuse, poor movement patterns, or unhealed minor injuries. Whether you’re active in sport or sit long hours for work or study, symptoms like clicking, tightness, or discomfort with activity shouldn't be ignored.

Early attention can prevent more complex issues later, particularly around cartilage and joint tracking.

Non-surgical management is usually effective, but arthroscopy or targeted interventions may be considered in select cases.

More on knee pain in young adults →

Knee Pain in Older Adults

Older adults often experience knee pain related to joint wear, cartilage thinning, or underlying arthritis. This may present as stiffness after rest, discomfort with walking, or reduced range of motion.

It’s also important to consider how knee pain may affect balance, mobility, and overall independence.

When conservative approaches are no longer effective, procedures like total or partial knee replacement may be discussed.

More on knee pain in older adults →

Early Signs of Knee Arthritis

You might not notice arthritis at first. However, subtle signs like joint clicking, occasional swelling, or morning stiffness could indicate early cartilage changes.

Paying attention to these early signs and learning more about early arthritis symptoms may help you recognise changes in your knee sooner and explore joint-preserving strategies before significant degeneration occurs.

Speak to your GP about imaging, exercise guidance, or whether a specialist review is needed.

More on early signs of arthritis →

What Should I Do If I Have Knee Pain?

If you’re experiencing knee symptoms that are limiting your movement, activity, or comfort, don’t ignore them. Early diagnosis can make a big difference in what treatment options are available.

In some cases, discomfort in the knee may stem from the hip, making it helpful to understand the potential link between hip and knee pain when considering possible causes.

Sydney-based orthopaedic knee surgeon Dr Jonathan Negus accepts referrals for patients needing further assessment or surgical discussion. Start by speaking with your GP or physiotherapist to determine if a referral is right for you.

How Are Knee Conditions Diagnosed?

Assessment usually involves:

• A detailed medical history and physical examination
• Joint testing, including strength, stability, and mobility assessments
• Imaging (such as MRI or X-rays) to examine internal structures
• Referral to an orthopaedic knee specialist if structural damage is suspected

In some cases, a diagnostic injection or keyhole procedure may help confirm the source of your symptoms.

What Are the Treatment Options?

Your treatment plan will depend on the condition, severity, lifestyle goals, and personal preferences. It may include:

• Physiotherapy and guided rehabilitation
• Pain management, including medications or injections
• Lifestyle adjustments, such as footwear or activity changes
• Surgical options, where indicated, such as:
  • Knee arthroscopy (keyhole surgery for diagnosis or repair)
  • Ligament reconstruction (for instability or tears)
  • Partial knee replacement (for localised arthritis)
  • Total knee replacement (for widespread joint damage)
  • Robotic-assisted surgery (for enhanced alignment in suitable cases)

Treatment decisions are always made on a case-by-case basis. Results vary, and not all procedures are suitable for every patient.

Need Support With a Knee Condition?

If knee pain, instability, or stiffness is interfering with your daily life, it’s time to get clarity. A GP or physiotherapist can guide your first steps, and if specialist care is needed, Dr Jonathan Negus is here to help.

Dr Negus is an orthopaedic knee surgeon based in Sydney, offering expert assessment and surgical treatment for a full range of knee conditions. If you're ready to understand what’s really going on and explore your options, speak with your GP about a referral or get in touch with Dr Negus’ clinic directly.