Darker cells mean a higher score for this topic on that metric.
LessMore
Last reviewed Sources & creditsMedia creditsMethodology
Quick answers
What is patellofemoral pain syndrome?
Patellofemoral pain syndrome describes pain around or behind the kneecap, often related to how the kneecap tracks in its groove during bending movements, and is common among runners and young active individuals.
What is the difference between the meniscus and the ACL?
The menisci are C-shaped cartilage cushions that absorb shock between the thigh and shin bones, while the anterior cruciate ligament (ACL) is one of several ligaments that control the knee's stability during rotation and forward sliding of the shin bone.
Does every meniscus tear need surgery?
Many meniscus tears, particularly smaller or degenerative tears in middle-aged and older adults, are managed successfully with exercise-based rehabilitation, while larger or mechanically unstable tears may be considered for surgical repair.
Is running bad for the knees?
Current evidence generally does not support the idea that recreational running increases the risk of knee osteoarthritis, and moderate running is often considered compatible with long-term joint health for most people.
What does a 'locked knee' mean?
A locked knee refers to an inability to fully bend or straighten the joint, often due to a displaced piece of torn meniscus or loose cartilage fragment, and typically warrants prompt evaluation.
How common is knee osteoarthritis?
Knee osteoarthritis is among the most common joint conditions affecting older adults, with prevalence increasing steadily with age and additional risk associated with prior injury and higher body weight.
Certain movements and habits are commonly discouraged during knee rehabilitation because they place excessive strain on irritated tissue or increase the risk of further injury.
Recognizing signs of overload helps prevent setbacks, particularly given the knee's tendency toward recurring irritation when load is increased too quickly.
Stop rules & donts
When to stop and reassess: Sharp pain or a sense of giving way
When to stop and reassess: Increasing swelling after activity
When to stop and reassess: Locking or catching sensation
What programmes usually avoid: Sudden increases in running or jumping volume
What programmes usually avoid: Deep, loaded knee bending early after injury
What programmes usually avoid
Sudden increases in running or jumping volume
Rapidly increasing high-impact training load is a commonly cited contributor to overuse knee conditions and is generally advised against in favor of gradual progression.
Deep, loaded knee bending early after injury
Heavily loaded deep squatting or kneeling soon after an acute injury is generally discouraged until swelling and pain have settled.
Ignoring persistent swelling
Continuing higher-demand activity despite ongoing swelling is generally discouraged, since it can indicate the joint has not fully settled from the initial injury.
Pivoting on a fixed foot with instability symptoms
Twisting or pivoting movements are generally avoided in the presence of a sense of the knee giving way, since this can risk further ligament or meniscus injury.
Prolonged inactivity
Extended avoidance of all activity is generally discouraged for most knee conditions, since graded movement and loading typically support better recovery than complete rest.
When to stop and reassess
Stop the session and seek clinical review if these appear — do not push through them.
Sharp pain or a sense of giving way
A sudden sharp pain or a feeling that the knee might give way during an exercise is a signal to stop and reassess rather than continue.
Increasing swelling after activity
Swelling that increases significantly in the hours following exercise suggests the load exceeded the joint's current tolerance.
Locking or catching sensation
A new sensation of the knee catching or locking during movement warrants stopping the activity and seeking evaluation.
Symptoms persisting beyond a day
Discomfort expected to settle within hours but instead lingering or worsening overnight suggests the load was too advanced for the current phase.
These general precautions reflect common clinical patterns and are not a substitute for individualized guidance, particularly following a significant ligament, meniscus, or fracture injury.
Keep exploring
Neighbouring regions
Neighbouring topics share region literacy — not a severity ranking.
Hip
The hip is a deep, stable ball-and-socket joint that bears several times body weight during walking and running, making it a common site of both overuse pain and degenerative change.
Pain frequency 55 Same body regionACL
The anterior cruciate ligament stabilizes the knee against pivoting and forward-sliding forces, and its rupture is one of the most studied and rehabilitation-intensive sports injuries.
Pain frequency 50 Same body regionAnkle & Foot
The ankle and foot absorb and redirect the full force of body weight with every step, making sprains and overuse injuries among the most common in sport and daily life.
Pain frequency 70 Same body region