Could my knee pain be one of these problems

Knee pain that creeps in during the 40s, 50s and beyond often doesn’t start with one clear “pop” or big injury. It may show up as a nagging ache on stairs, a sharp twinge when turning in the kitchen, or a front-of-knee pain that flares after a run or a gym session.

In this article, the focus is on three common, often manageable knee pain generators that tend to sit at the front of the knee or along the inner/outer joint line: degenerative meniscus tears, patellar tendinopathy (“jumper’s knee”), and prepatellar/infrapatellar bursitis.

• Degenerative meniscus tear: often a deep ache at the joint line (inside or outside of the knee) or a sharper “catching” pain with twisting, squatting, or standing up from low chairs, sometimes with clicking, catching, or a sense of locking/blockage rather than a single traumatic event.
• Patellar tendinopathy (jumper’s knee): a very localised pain at the lower edge of the kneecap (where the tendon begins), typically worse during or after jumping, running, sprinting, change of direction, or repeated squats, and often minimal at rest.
• Prepatellar/infrapatellar bursitis: a visible, tender swelling over the kneecap (prepatellar) or just below it (infrapatellar), commonly linked with frequent kneeling on hard surfaces or a direct bump, with knee bending usually fairly well preserved.

These patterns can overlap, and other knee problems—including osteoarthritis, cartilage damage, ligament injury, or patellofemoral pain—can feel similar. The sections that follow cover how clinicians usually tell these apart, what a conservative-first plan commonly involves, and when imaging, injections or surgery may enter the discussion.

Degenerative meniscus tears in midlife

Twisting to turn in bed, rising from a low chair, or crouching in the garden can be the moment a “degenerative” meniscus tear announces itself in midlife—often without a single memorable injury. In this setting, the meniscus is best thought of as a firm, C‑shaped cartilage “cushion” inside the knee that helps the thigh bone (femur) and shin bone (tibia) fit together, spread load and protect the joint surface. When that cushioning tissue becomes frayed through years of use, symptoms can start after a minor twist, a kneel, or even everyday walking or squatting rather than a clear sports trauma event.

Typical day‑to‑day symptoms sit deep along the joint line (most often the inner/medial side) and tend to flare with certain movements rather than being constant:

• pain with twisting, squatting, kneeling, stairs, or getting up from a chair
• clicking, catching, or a brief sense of “giving way”
• occasional short “locking” episodes in some cases
• swelling that comes and goes after heavier use

Healing is limited in many degenerative tears because only the outer third of the adult meniscus has a good blood supply. Tears in the more central, poorly vascularised region are therefore unlikely to knit back together on their own, even when symptoms settle.

Assessment usually starts with a careful history and examination (including joint‑line tenderness and manoeuvres that try to reproduce the catching pain). An X‑ray is often used to look for osteoarthritis changes in the knee. MRI can then help confirm the tear pattern and check the rest of the joint, but clinicians generally interpret MRI findings alongside symptoms and examination rather than treating the scan as a stand‑alone explanation for pain.

For most middle‑aged adults, first‑line treatment is conservative: activity modification, anti‑inflammatory pain relief where appropriate, and a structured physiotherapy programme aimed at restoring knee movement, strength and control. In a study summarised in Medscape, a 12‑week supervised exercise programme produced outcomes comparable to arthroscopic partial meniscectomy (keyhole “trimming” surgery) for degenerative tears, with greater quadriceps strength in the exercise group—supporting a rehab‑first approach for many people.

Surgery can still have a role when high‑quality rehabilitation hasn’t restored function, particularly where mechanical symptoms are clear and match the MRI pattern; if arthroscopy is done, preserving as much viable meniscus as possible is commonly emphasised for joint longevity. Longer‑term joint protection also shapes decision‑making: in a 48‑month (4‑year) observational study of 189 patients with degenerative meniscal tears, radiographic osteoarthritis progression was more pronounced in groups who had arthroscopic partial meniscectomy or intra‑articular corticosteroid injections than in a non‑treatment group, and repeated steroid injections were linked with faster joint space narrowing than a single injection. Findings like these do not prove cause and effect in every individual, but they help explain why many pathways prioritise joint‑preserving steps (rehabilitation and load management) before escalating to invasive options.

Patellar tendinopathy jumper’s knee

That pinpoint soreness right at the bottom edge of the kneecap—especially after a run, a shift with lots of stairs, or a gym session with squats—often comes from the patellar tendon rather than from “inside” the knee joint. The patellar tendon is the strong band running from the lower pole of the patella (kneecap) to the tibial tuberosity (the bony bump at the top of the shin), and it helps transmit quadriceps force to straighten the knee during jumping, running and climbing.

Patellar tendinopathy is usually a long‑standing overload problem rather than a short-lived bout of simple “tendonitis”. In practical terms, this changes the focus from trying to “settle inflammation” for a few days to rebuilding the tendon’s tolerance to load with a structured strengthening plan (often over several months), while temporarily dialling down the specific activities that keep flaring it.

A pattern check helps separate it from other front‑of‑knee problems such as bursitis (a visible, local swelling over or below the kneecap) or more diffuse patellofemoral pain:

• Is the pain highly localised to the inferior pole of the patella (sometimes the upper pole), rather than spread around the whole kneecap?
• Does it reliably worsen with “knee extensor” loading—jumping, sprinting, cutting, deep squats, stairs—and often ease at rest?
• Is there tenderness when pressing the tendon right at its attachment on the kneecap?

Certain settings make this more likely: jumping and change‑of‑direction sports such as basketball, volleyball, netball and football; sudden training spikes (for example, adding hill sprints in one week); and hard surfaces or suboptimal footwear. It can also show up outside sport, including repeated squats, heavy lifting, or kneeling-heavy work where the knee is repeatedly loaded under bend.

Diagnosis is mainly clinical: the combination of the pain location and its predictable behaviour with load is the core. Ultrasound or MRI may be used when symptoms are atypical, not improving, or when there is a need to confirm tendon change or exclude other causes of anterior knee pain; they are not always necessary at the start.

Rehabilitation is usually built around load management plus progressive tendon-loading exercise (eccentric and/or heavy slow resistance). In a runner, “load management” might mean temporarily reducing speed work and jump drills while building a planned strengthening programme; in a job involving lots of stairs or squatting, it may mean spacing heavy knee-bend tasks and strengthening around them. Consensus guidance places exercise-based rehabilitation as the primary treatment, with injections or other adjuncts typically considered only after this has been properly optimised.

Prepatellar and infrapatellar bursitis

A sudden, localised “bag of fluid” at the front of the knee often points to a bursa rather than a problem deep inside the joint. A bursa is a small, synovial fluid‑filled cushion that helps reduce friction where skin, tendon, muscle and bone move against one another—especially around bony points like the kneecap.

Prepatellar bursitis (over the kneecap)

With prepatellar bursitis, the swollen bursa sits directly on top of the patella, so the swelling is usually obvious in the centre of the knee cap area. Typical features include a soft, sometimes “water‑balloon” swelling, tenderness to touch, and pain mainly when kneeling or when something presses on the kneecap; knee bending and straightening are often relatively well preserved compared with many intra‑articular problems.

Infrapatellar bursitis (just below the kneecap)

Infrapatellar bursitis involves one of the bursae below the patella (superficial or deep), so the tenderness and swelling sit under the kneecap rather than over it. Symptoms are often described as pain, swelling and redness just below the kneecap, and in longer‑standing cases the swelling can feel surprisingly firm, presenting like a distinct lump under the patella.

Across Lincolnshire jobs and sports, the usual triggers are mechanical: repeated kneeling on hard surfaces (classically carpet laying, gardening, plumbing and roofing) or a direct fall/blow onto the front of the knee. Less commonly, prepatellar bursitis can be linked to infection or inflammatory conditions such as gout or rheumatoid arthritis.

A key safety point is separating everyday irritation from septic (infected) bursitis. Red flags include:

• rapidly increasing redness or warmth over the kneecap
• marked tenderness with a hot, shiny swelling
• systemic symptoms (for example, feeling unwell), or a skin break over the bursa

When infection is suspected, aspiration and analysis of bursal fluid may be used as part of assessment, and antibiotics (sometimes with drainage) are typically required.

For most non‑septic cases, the starting pathway is conservative: stepping back from kneeling, using ice and compression, elevation, and anti‑inflammatory medication where appropriate. If swelling persists or repeatedly returns, clinicians may consider aspiration and, in selected cases, corticosteroid injection. Surgery is uncommon, but for intractable cases one series reported symptom relief after outpatient endoscopic bursectomy in 60 patients, with no recurrences at an average 36‑month follow‑up.

Telling these knee problems apart

Online symptom checkers can be a useful starting point, but knee pain rarely fits one neat label. This section therefore stays focused on practical symptom patterns and the sort of findings clinicians look for, rather than directing care towards any specific provider.

A quick pattern guide (location • triggers • swelling)

• Degenerative meniscus tear (joint-line, “inside” the knee)
• • Where: pain often feels deep, commonly along the inner or outer joint line.
  • Behaviour: may flare with twisting, deep squats, kneeling or uneven ground; some people describe clicking, catching or locking.
  • Swelling: can be a more general puffiness/effusion rather than a discrete lump.
• Patellar tendinopathy (patellar tendon, usually just below the kneecap)
• • Where: pain is typically very localised at the inferior pole of the patella (occasionally higher).
  • Behaviour: pain is clearly load-related—worse with jumping, running, sprinting, cutting or repeated squats—and often quieter at rest.
  • Swelling: often little to see; the key is focal tenderness.
• Prepatellar bursitis (over the kneecap)
• • Where: tenderness and a visible, soft swelling directly over the patella.
  • Behaviour: aggravated mainly by kneeling or direct pressure; knee bending/straightening is often fairly well preserved.
  • Swelling: a localised “lump” at the front of the knee.
• Infrapatellar bursitis (below the kneecap)
• • Where: pain and swelling just below the kneecap.
  • Behaviour: often overlaps with kneeling/pressure pain, and may co-exist with patellar tendon symptoms.
  • Swelling: localised swelling (sometimes with redness) below the patella.

Other knee problems that can feel similar

Pain “at the front” of the knee is not always tendon or bursa. Problems in the patellofemoral joint (behind the kneecap), or early knee osteoarthritis with more diffuse aching and stiffness, can overlap with the patterns above—particularly in the 40s–60s age range. For that reason, clinicians typically treat the pain pattern and examination as the starting point, with imaging used to clarify uncertainty rather than to replace the clinical picture.

What a clinician actually does in the room

A knee assessment often begins with targeted palpation: pressing along the medial/lateral joint line (meniscus), the inferior patellar pole/patellar tendon (tendinopathy), and directly over/under the kneecap (prepatellar or infrapatellar bursae). Symptoms are then explored with movement and provocation—for example bending, straightening and gentle twisting manoeuvres for suspected meniscal pain—and with functional tasks such as a squat, step-down, or (in appropriate athletes) a small hop to see whether pain is load-related in the way patellar tendinopathy typically is.

Imaging: what it’s good for (and what it can’t do on its own)

• X-ray: mainly assesses bone alignment and joint-space narrowing, which can support or refute suspected osteoarthritis.
• Ultrasound: often useful for bursal swelling and tendon changes, and can also be used to guide aspiration or injection when that is being considered.
• MRI: best for detailed assessment of the meniscus and cartilage, and can help in atypical cases; however, meniscal and tendon signal changes can be seen even when symptoms are not clearly driven by that structure, so MRI findings still need to match the history and examination.

Where urgent assessment is generally needed is when infection is suspected, such as a rapidly increasing hot, red prepatellar swelling with systemic illness, as this can require antibiotics and sometimes drainage.

What to expect from a knee assessment and treatment pathway

In a consultant-led knee clinic, the first decision is usually not “scan or surgery”, but whether the pain pattern fits a joint problem (such as a degenerative meniscus tear) or a surface structure at the front of the knee (patellar tendon or bursa). To avoid repeating the imaging detail already covered earlier, the emphasis here is on what tends to happen after that initial clinical reasoning: a stepwise plan, review points, and what “progress” looks like.

A typical first appointment starts with a detailed history anchored to day-to-day triggers: twisting and deep flexion (meniscus-type symptoms), jumping/running loads (patellar tendon), or prolonged kneeling and direct pressure (prepatellar/infrapatellar bursae). Examination then targets the structures most likely to be responsible—joint-line assessment and meniscal provocation where relevant, palpation at the inferior patellar pole/patellar tendon for focal tenderness, and assessment of any discrete anterior swelling that may be bursal. Imaging is ordered selectively when it will change the plan or rule out important alternatives, rather than as a stand-alone diagnosis. (Patellar tendinopathy is a good example: diagnosis is primarily clinical, with imaging used mainly to confirm changes or exclude other causes.)

Where symptoms appear closely tied to how the knee is loading (for example, pain that reliably flares with stairs, squats, running or prolonged standing), some clinics add objective movement and loading assessment alongside the hands-on exam. At Lincolnshire Knee, this may include MAI Motion® gait/biomechanical assessment, and—when MRI is genuinely indicated—onMRI™ reporting support for detailed meniscus and cartilage analysis; both are intended to support clinical judgement, not replace it.

Across all three conditions, the usual starting point is conservative-first care: education about what the working diagnosis does (and does not) imply, activity modification rather than blanket rest, and a structured rehabilitation plan. Evidence summarised in clinical guidance for degenerative meniscal tears supports non-operative care (including physiotherapy) as first-line, and a 12-week supervised exercise programme has been reported to achieve similar outcomes to arthroscopic partial meniscectomy in middle-aged patients, with greater quadriceps strength in the exercise group. For patellar tendinopathy, published reviews and consensus guidance place progressive tendon-loading exercise (eccentric and/or heavy slow resistance) and load management at the centre of treatment. For bursitis, the practical “rehab” focus is often knee protection and task modification (especially kneeling exposure), with symptom control measures used alongside.

Injections or other biologic supports may be discussed when symptoms remain limiting despite a well-executed plan, but they are generally positioned as adjuncts to rehabilitation. This is particularly important in degenerative meniscal tears: a 48-month (4-year) observational study of 189 patients reported more pronounced radiographic OA progression in groups treated with arthroscopic partial meniscectomy or intra-articular corticosteroid injection compared with a non-treatment group, and multiple injections were associated with faster joint space loss than a single injection. Decisions therefore tend to be individualised around severity, goals and risk tolerance, rather than used as a default “next step”.

Surgery is usually the last rung. For degenerative meniscus tears, evidence reviews note that arthroscopic partial meniscectomy may give short-term relief in refractory cases—particularly when persistent mechanical symptoms match imaging—but long-term outcomes are often similar to conservative care, so a meniscus-preserving mindset is important. For chronic, recurrent prepatellar bursitis that has failed simpler measures, endoscopic bursectomy has been reported as an option; in one series of 60 patients treated as outpatients under local anaesthesia, all were symptom-free with no recurrence at an average 36-month follow-up. For patellar tendinopathy, operative approaches are uncommon and typically reserved for a small minority after prolonged, high-quality rehabilitation.

Lincolnshire Knee is part of the MSK Doctors group and accepts patients without referral; appointments can be booked at lincolnshireknee.co.uk.

1. [1] Evaluation of radiographic knee OA progression after arthroscopic meniscectomy compared with IACI for degenerative meniscus tear. (2025). https://doi.org/10.1038/s41598-025-95649-9 https://doi.org/10.1038/s41598-025-95649-9