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KneeTendinopathy / OveruseStrong evidence

Patellar Tendinopathy

Load-related pain at the patellar tendon, commonly at the inferior pole, in jumping and running athletes.

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Structures Involved

  • Patellar tendon, commonly proximal insertion
  • Quadriceps mechanism and patellofemoral joint may contribute to differential

Mechanism / Why It Happens

  • Repeated high-rate tendon loading from jumping, sprinting or rapid training increase
  • Insufficient recovery relative to load

Classification / Grades

  • Reactive/early load-related symptoms
  • Persistent tendon pain with reduced load capacity; imaging severity does not equal pain severity

Symptoms

  • Focal inferior patellar pain
  • Pain during jumping, landing, stairs or decline squat
  • Warm-up effect may occur

Clinical Signs

  • Local tendon tenderness
  • Pain with decline squat or resisted knee extension
  • Reduced jumping tolerance

Red Flags & Referral Clues

  • Acute pop with extensor mechanism failure
  • Inability to actively extend knee or perform straight-leg raise
  • Large traumatic effusion or suspected fracture

Diagnostic Examination

How to perform the tests — step by step

Each test includes patient setup, therapist position, hand placement, exact performance, positive finding and clinical interpretation.

Single-Leg Decline Squat

Load the patellar tendon and reproduce familiar focal tendon pain.

Patient position

Stand on a decline board if available; perform controlled single-leg squat to tolerable depth.

Therapist position

Position yourself to observe and stabilise the relevant segment without forcing the movement.

Hand placement

Use comfortable, controlled contact appropriate to the test; avoid painful compression or excessive force.

How to perform

  1. 1Explain the test and obtain consent.
  2. 2Screen contraindications and compare sides when appropriate.
  3. 3Perform the movement slowly and apply only the required resistance or stress.
  4. 4Record familiar symptom reproduction, range, strength and side-to-side difference.

Positive sign

Familiar focal inferior-pole/patellar tendon pain.

Interpretation

Supports tendon-related pain; distinguish patellofemoral pain and extensor mechanism tear.

Clinical note: A special test modifies clinical probability; it does not confirm a diagnosis in isolation.

Differential Diagnosis

  • Patellofemoral pain
  • Sinding-Larsen-Johansson in adolescents
  • Quadriceps tendinopathy
  • Patellar fracture

Investigations / Imaging

  • Usually clinical; ultrasound/MRI if uncertain, suspected tear or persistent symptoms despite rehabilitation.
  • Urgent imaging/referral for extensor mechanism failure.

Complete Rehabilitation Plan

From protection to full function

Phase 1 — Protection, Education & Symptom-Guided Loading

Address safety, settle excessive irritability and maintain useful movement.

What to do

  • Reduce jump/sprint volume to tolerable level
  • Maintain strength with isometrics or reduced-range resistance
  • Explain that complete rest often reduces capacity

Exercise dosage

  • Spanish squat or knee-extension isometric: 5 x 30–45 seconds if tolerated
  • Maintain pain-monitored daily activity

Progress when

  • Daily function is stable or improving.
  • No new red flags or progressive neurological deficit.
  • Exercise response returns to baseline by the following day.

Phase 2 — Mobility, Strength & Capacity

Restore the specific strength, mobility and control required by the condition.

What to do

  • Progress heavy slow resistance or eccentric-concentric loading
  • Build quadriceps and hip strength
  • Introduce low-level energy-storage drills when strength tolerates

Exercise dosage

  • Squat/leg press: 3–4 x 6–12, 2–3 days/week
  • Progress load when technique and next-day response acceptable

Progress when

  • Target movement and resistance are tolerated with good quality.
  • Functional capacity is improving without sustained symptom flare.
  • Progression is based on objective performance and patient goals.

Phase 3 — Functional Restoration & Return to Activity

Rebuild real-world, occupational or sporting capacity.

What to do

  • Progress hopping, jumping, landing and sport-specific volume
  • Increase intensity and volume separately
  • Monitor tendon response over 24 hours

Exercise dosage

  • Plyometrics: 2–4 sets of 5–10 contacts
  • Jump/sprint exposure 2–3 times/week with recovery

Progress when

  • Condition-specific return criteria are met.
  • Full task exposure is completed progressively.
  • No clinically meaningful deterioration during the following 24 hours.

Manual Therapy — Role & Application

  • Manual therapy may address coexisting mobility issues but does not remodel tendon by itself.
  • Avoid aggressive painful tendon friction.

Modalities — Use / Avoid

  • Taping/straps may offer temporary symptom relief in selected athletes.
  • Passive modalities should not replace progressive tendon loading.

Return / Discharge Criteria

  • Repeated heavy knee extension tolerated
  • Hopping and jumping completed with acceptable symptoms
  • Full training volume and next-day recovery demonstrated

Common Clinical Mistakes

  • Only eccentric decline squats for everyone
  • Increasing jumps and running simultaneously
  • Using imaging to dictate symptoms or clearance

Clinical Pearls

  • Progressive loading is the foundation; select isometric, isotonic and plyometric stages by capacity.
  • A tendon may remain structurally abnormal after function improves.

Continue learning

Connect assessment with management

Use the related PNA learning pathways to explore examination techniques and structured rehabilitation. A test result should always be interpreted alongside the history, full examination and clinical presentation.

Evidence sources

Use these sources as a starting point for clinical learning. A reference being listed here does not, by itself, establish that every recommendation on this page is strongly supported. Check the original publication, study design, population and limitations before applying findings to an individual patient.

Educational resource only. Tests and treatment plans must be adapted to the individual patient, irritability, comorbidities, surgical restrictions and local scope-of-practice requirements.