Knee Pain and Stiffness: What Could It Be, and How We Can Help
- staystrongtherapy
- Jun 30
- 7 min read
All information in this blog is supported by NICE guidance and peer-reviewed research. Reference numbers appear throughout, with the full list at the bottom of the page.
Knee Pain Can Come From Several Different Places
The knee is a genuinely complex joint, and pain here can arise from several distinct structures, the kneecap and its tracking, the cartilage cushioning the joint, the ligaments providing stability, or the surrounding tendons and soft tissue. Where exactly your pain is felt, and what brings it on, gives genuinely useful clues as to what's actually going on.
What Could It Potentially Be?
Pain at the front of the knee or kneecap: most commonly patellofemoral pain syndrome (also known as runner's knee), the single most common cause of knee pain overall, affecting more than 20% of young adults and occurring around 2.5 times more often in women than men. ¹ Also consider arthritis, prepatellar bursitis, or chondromalacia patella, damage to the cartilage on the back of the kneecap, typically affecting healthy people under 40. ²
Pain below the kneecap: often related to the patellar tendon, bursitis, or in children and adolescents, growth-related conditions. ²
Inner (medial) knee pain: consider a medial collateral ligament injury, medial meniscus tear, or osteoarthritis. ²
Outer (lateral) knee pain: iliotibial band syndrome or a lateral meniscus injury are common causes, with lateral collateral ligament sprains being considerably less common, typically resulting from a specific twisting mechanism. ² ³
Pain behind the knee: possible causes include a Baker's cyst, ligament injury, or calf strain. ²
Generalised knee stiffness, particularly in the morning: this pattern is genuinely important diagnostically, and is discussed in detail below in relation to osteoarthritis.
Patellofemoral Pain Syndrome: A Closer Look
Given how common this is, it deserves particular attention. Patellofemoral pain syndrome describes knee pain resulting from problems between the kneecap and the thigh bone, generally felt at the front of the knee, coming on gradually. ¹ While the exact cause is unclear, it's believed to relate to overuse, with risk factors including previous trauma, increased training load, and weak quadriceps muscles, and it's particularly common among runners. ¹
Common symptoms: pain in and around the kneecap during activity, pain after sitting for a long time with the knees bent, sometimes with associated weakness or a feeling of instability, and rubbing, grinding, or clicking sensations when bending and straightening the knee. ⁴
This condition genuinely matters to address properly, as 70 to 90% of people with initial patellofemoral pain experience recurrent or chronic symptoms, and prolonged cases can progress toward patellofemoral arthritis over time. ⁵
Iliotibial Band Syndrome: A Closer Look
The iliotibial band is a thick, fibrous band of fascial tissue running from the iliac crest down the outer thigh, now more accurately referred to as iliotibial band pain rather than the older "syndrome" terminology, typically presenting as pain or tenderness on the outer side of the knee, just above the joint line. ⁶ Research has linked altered tension in this band to several related conditions, including iliotibial band pain itself and patellofemoral issues, reflecting how interconnected the structures around the knee genuinely are. ⁷
Risk Factors
Running and repetitive knee flexion activities, particularly relevant to patellofemoral pain and iliotibial band syndrome ⁵
Previous knee trauma
Increased or sudden changes in training load
Weak quadriceps muscles, a recognised risk factor for patellofemoral pain ¹
Female sex, patellofemoral pain occurs notably more often in women ¹
Sudden twisting or pivoting movements, the classic mechanism for meniscus and ligament injuries ³
Age, knee osteoarthritis becomes considerably more common with age
Sports involving cutting, pivoting, or sudden direction changes, particularly relevant for ligament and meniscus injuries
When Stiffness Is the Main Feature: Could It Be Osteoarthritis?
If your main complaint is stiffness, particularly in the morning, alongside activity-related pain, NICE has set out specific, validated diagnostic criteria worth knowing about. NICE recommends that adults aged 45 or older can be diagnosed with knee osteoarthritis without further investigation if they have activity-related knee pain and either no morning joint-related stiffness, or morning stiffness lasting no longer than 30 minutes. ⁸
This criteria has genuinely good diagnostic accuracy. Research validating these NICE criteria found a sensitivity of 0.84 and specificity of 0.85 for identifying symptomatic knee osteoarthritis, supporting their use in clinical practice for timely diagnosis without the need for imaging in most cases. ⁹ NICE is explicit that imaging is not routinely required for diagnosis, and should only be considered when there are atypical features or features suggesting an alternative diagnosis. ¹⁰
Common Signs and Symptoms by Cause
Patellofemoral pain: front-of-knee pain with activity, worse with stairs or prolonged sitting, possible grinding sensation.
Osteoarthritis: activity-related pain, morning stiffness of 30 minutes or less, gradual symptom progression with flare-ups. ¹⁰
Meniscus tear: often a sudden twisting mechanism, possible locking or catching, joint line tenderness. ³
Ligament sprain: acute onset following a specific stress to the knee, point tenderness, possible instability. ³
Iliotibial band syndrome: lateral knee pain, worse with running, particularly downhill. ⁶
What to Look Out For
Please seek prompt medical assessment if you experience:
Inability to bear weight or significant locking of the knee
A visible deformity following injury
Significant swelling developing rapidly after trauma
Fever, redness, or warmth around the knee (possible infection)
Significant, unexplained weight loss alongside knee pain
Numbness or weakness in the lower leg
How Is It Diagnosed?
Diagnosis relies primarily on history and clinical examination. For suspected osteoarthritis, NICE's validated criteria, age, activity-related pain, and morning stiffness pattern, generally allow diagnosis without imaging. ⁸ For suspected ligament or meniscus injury, specific clinical tests, alongside the mechanism of injury, guide assessment, with imaging reserved for cases where the diagnosis remains unclear or where it would change management. You may need an X-ray if a fracture or significant injury is suspected, or an MRI for persistent symptoms, locking, or suspected ligament or meniscus tears. ²
Myths vs Facts
"Knee pain at my age must be arthritis." Not necessarily, several distinct conditions can cause knee pain at any age. The NICE criteria specifically help distinguish osteoarthritis based on the pattern of pain and stiffness, rather than age alone.
"I need a scan to find out what's wrong." Often not. NICE guidance is clear that imaging is not routinely required to diagnose osteoarthritis, and a thorough clinical assessment is generally sufficient for most knee conditions.
"Once patellofemoral pain settles, it won't come back." Recurrence is genuinely common, affecting 70 to 90% of people with an initial episode, which is why addressing the underlying contributing factors, not just the pain itself, matters for lasting recovery.
How We Can Help
NICE guidance for osteoarthritis emphasises education, weight management advice where relevant, and staying physically active as the foundation of management, with exercise and non-drug approaches prioritised over medication. ¹¹
Osteopathic manual techniques and manual therapy: used to address restriction and compensatory tension around the knee, hip, and surrounding structures, supporting overall function and movement quality.
Deep tissue and sports massage: targeted soft tissue work for the quadriceps, iliotibial band, and surrounding muscles, areas commonly involved across several of the most common knee conditions.
Medical acupuncture and cupping: used alongside exercise-based treatment to support pain management.
Biomechanical and load management advice: practical guidance on training load, footwear, and movement patterns, particularly relevant for runners and athletes with patellofemoral or iliotibial band-related pain.
Exercise and Rehabilitation
Targeted exercise is the evidence-based cornerstone of treatment across the most common causes of knee pain.
Quadriceps strengthening: a core, well-evidenced component of patellofemoral pain management, directly addressing one of the recognised risk factors. ¹
Hip and gluteal strengthening: supports overall knee alignment and reduces excessive load through the patellofemoral joint.
Range of motion and mobility exercise: supports joint health in osteoarthritis, in line with NICE's emphasis on staying active.
Iliotibial band and surrounding muscle release: alongside strengthening, particularly relevant for lateral knee pain.
Graded return to running or sport: a structured, progressive approach to managing training load and reducing recurrence risk.
Your practitioner will guide a programme tailored to the specific structure identified as the source of your symptoms.
What to Expect at Your First Appointment
We will take a thorough history, including the location, onset, and pattern of your symptoms, alongside a hands-on assessment to identify which structure is most likely involved. Where appropriate, we will apply NICE's validated diagnostic criteria for osteoarthritis. We will explain clearly what we find and build an evidence-based treatment plan focused on restoring strength and function.
Frequently Asked Questions
Do I need a scan? Not always. For suspected osteoarthritis particularly, NICE guidance supports clinical diagnosis without imaging in most cases. Imaging is more relevant for suspected ligament, meniscus, or significant structural injury.
Will I need surgery? Most people don't. Conservative, exercise-based treatment is the recommended first-line approach across the most common knee conditions.
Why does my knee hurt more after sitting for a while? This is a classic feature of patellofemoral pain, often described as worse after prolonged sitting with the knee bent, sometimes called the "movie theatre sign."
Could my knee pain actually be coming from my hip? Yes, genuinely. Hip muscle weakness and altered mechanics are recognised contributors to patellofemoral pain, which is why a thorough assessment often looks beyond the knee itself.
Recognise these symptoms? Get in touch using the contact form and we will assess and build the right treatment plan for you.
References
Patellofemoral pain syndrome. Wikipedia. Available at: https://en.wikipedia.org/wiki/Patellofemoral_pain_syndrome
Knee Pain Diagnosis Chart: What Your Knee Pain Location Means. Knee Pain Explained. Available at: https://www.knee-pain-explained.com/knee-pain-diagnosis-chart.html
Evaluation of Patients Presenting with Knee Pain: Part II. Differential Diagnosis. American Family Physician. Available at: https://www.aafp.org/pubs/afp/issues/2003/0901/p917.html
Patellofemoral Pain Syndrome (Runner's Knee). Johns Hopkins Medicine. Available at: https://www.hopkinsmedicine.org/health/conditions-and-diseases/patellofemoral-pain-syndrome-runners-knee
Acute effects of negative heel shoes on perceived pain and knee biomechanical characteristics of runners with patellofemoral pain. Journal of Foot and Ankle Research. 2024. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11296720/
Iliotibial Band Syndrome. Physiopedia. Available at: https://www.physio-pedia.com/Iliotibial_Band_Syndrome
Bonoan M, Morales M, Liu XW, et al. Iliotibial Band Syndrome Current Evidence. Current Physical Medicine and Rehabilitation Reports. 2024. Available at: https://doi.org/10.1007/s40141-024-00442-w
National Institute of Health and Care Excellence Clinical Criteria for the Diagnosis of Knee Osteoarthritis: A Prospective Diagnostic Accuracy Study in Individuals With Type 2 Diabetes. Arthritis Care & Research. 2025. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC12038217/
National Institute of Health and Care Excellence Clinical Criteria for the Diagnosis of Knee Osteoarthritis. Arthritis Care & Research. 2025. Available at: https://acrjournals.onlinelibrary.wiley.com/doi/10.1002/acr.25464
NICE on the diagnosis and management of osteoarthritis. Prescriber. 2023. Available at: https://wchh.onlinelibrary.wiley.com/doi/10.1002/psb.2040
National Institute for Health and Care Excellence (NICE). Osteoarthritis in over 16s: diagnosis and management. NICE Guideline [NG226]. Available at: https://www.nice.org.uk/guidance/ng226
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