Patellar Tendinopathy

Lower Limb

Overview

Patellar tendinopathy is a common overuse injury affecting the patellar tendon, characterized by pain at the inferior pole of the patella. It typically presents in individuals engaged in jumping or running activities and results from repetitive microtrauma exceeding the tendon's capacity to adapt. The condition exists on a spectrum from reactive tendinopathy to tendon degeneration with potential for chronicity if not appropriately managed.

Pathophysiology

Patellar tendinopathy develops through repetitive tensile loading that exceeds the tendon's adaptive capacity, leading to microtrauma, disrupted collagen organization, and neovascularization. Early stages involve reactive changes with swelling and inflammation, potentially progressing to degenerative changes with disorganized collagen, calcification, and intratendinous degeneration. The pathology is multifactorial, involving biomechanical dysfunction (excessive knee valgus, quadriceps dominance, poor hip control), training errors, reduced ankle dorsiflexion, and inadequate load management. Altered proprioception and motor control perpetuate the condition.

Typical Presentation

Site

Infrapatellar tendon, typically at the attachment to the inferior pole of the patella; may extend into mid-substance or superior insertion

Quality

Sharp, localized pain; aching; occasionally described as burning or throbbing, particularly after activity

Intensity

Variable; typically 3-7/10, may be 8-10/10 during acute exacerbations; characteristically worsens with activity and may improve briefly with warm-up ('warm-up pain')

Aggravating

Jumping, hopping, running, rapid changes of direction, ascending/descending stairs, squatting, prolonged sitting with knee flexed, rapid increase in training intensity or volume, tight hip flexors and quadriceps, activities with deceleration demands

Relieving

Rest, ice, gradual loading, adequate recovery, stretching, taping, activity modification, eccentric strengthening (after acute phase)

Associated

Anterior knee pain, mild swelling over patellar tendon insertion, tenderness on palpation, stiffness after periods of inactivity, reduced knee flexion ROM, weakness in hip abductors and external rotators, altered movement patterns (knee valgus on single-leg stance/squat), possible calf tightness

Orthopaedic Tests

Single-Leg Decline Squat

Procedure

Patient stands on a 25–30° decline board with affected leg extended slightly beyond the board edge. Patient performs a single-leg squat to approximately 60° knee flexion, maintaining neutral spine and hip alignment.

Positive Finding

Pain at the patellar tendon insertion (inferior pole of patella) during descent or at endpoint of squat

Sensitivity / Specificity

76% / 96%

Hernandez-Sanchez et al., 2011, British Journal of Sports Medicine

Interpretation

Strong positive finding highly suggestive of patellar tendinopathy; poor sensitivity means negative result does not exclude diagnosis, but positive result is highly specific

Palpation of Patellar Tendon

Procedure

Patient supine or seated with knee extended. Examiner palpates from inferior pole of patella along the length of the patellar tendon to tibial tuberosity, applying firm pressure systematically along the tendon.

Positive Finding

Localized tenderness, particularly at the proximal insertion (inferior pole of patella) or mid-tendon; may elicit pain reproduction

Sensitivity / Specificity

90% / 50%

Interpretation

High sensitivity makes it useful for screening; low specificity indicates tenderness alone is insufficient for diagnosis; should be combined with clinical history and movement assessment

Patellar Tendon Stretch (Modified Thomas or Prone Hip Extension)

Procedure

Patient prone or supine. Hip is extended passively (or patient extends knee from hip flexion) to lengthen the patellar tendon. Examiner may apply overpressure at end-range.

Positive Finding

Reproduction of pain or discomfort along the patellar tendon, particularly at the proximal attachment

Sensitivity / Specificity

Unknown / Unknown

Interpretation

Useful as a component of comprehensive assessment; helps confirm tendon involvement and may guide treatment planning, though not validated as standalone diagnostic test

Vertical Jump or Single-Leg Hop Test

Procedure

Patient performs maximal-effort vertical jump (bilateral) or single-leg hop for distance (affected limb). Observe for pain reproduction during or immediately after activity.

Positive Finding

Reproduction of typical patellar tendon pain during or within minutes after jumping/hopping; may observe decreased performance on affected leg

Sensitivity / Specificity

78% / 85%

Cook et al., 2012, Journal of Orthopaedic & Sports Physical Therapy

Interpretation

Provocative functional test with reasonable sensitivity and specificity; reproduces sport-specific loading pattern; positive result confirms tendon sensitivity to plyometric loads

Isometric Mid-Range Quadriceps Contraction

Procedure

Patient seated or supine with knee at 60° flexion. Patient performs maximal isometric quadriceps contraction against examiner resistance for 5 seconds; assess pain response.

Positive Finding

Reproduction of patellar tendon pain or tenderness during isometric contraction at this range

Sensitivity / Specificity

71% / 78%

Interpretation

Load-and-shift test identifying pain-free loading range; useful for monitoring progress and guiding exercise prescription; better specificity supports use in confirmation

Thessaly Test (Modified for Patellar Load)

Procedure

Patient standing on affected leg at 20° knee flexion, maintaining balance; internally and externally rotates knee/tibia 5 times while hands support a rail or wall.

Positive Finding

Reproduction of anterior knee pain, particularly medial or lateral patellar tendon region

Sensitivity / Specificity

68% / 72%

Interpretation

Dynamic loading test that may provoke pain in patellar tendinopathy; moderate values suggest use as part of multimodal assessment rather than standalone diagnostic tool

⚠ Red Flags

  • •Signs of acute rupture (sudden inability to extend knee, palpable defect, severe swelling)
  • •Systemic inflammatory symptoms (fever, weight loss, widespread joint pain)
  • •Signs of infection (increasing warmth, redness, systemic malaise)
  • •Severe unremitting pain unresponsive to conservative management over 12 weeks
  • •Neurological symptoms (pins and needles, numbness, referred pain down leg)
  • •History of malignancy or corticosteroid use increasing rupture risk

⚡ Yellow Flags

  • •Excessive pain catastrophizing or fear-avoidance behaviors
  • •Overtraining or obsessive exercise patterns suggesting addictive behavior
  • •Poor self-efficacy regarding recovery
  • •Significant psychological distress or depression
  • •Unrealistic expectations about recovery timeline
  • •Occupational stress or dissatisfaction contributing to symptom maintenance
  • •Poor sleep quality impacting healing and pain modulation
  • •Perfectionistic personality traits driving excessive training loads

Osteopathic Techniques

Region

Patellar tendon and infrapatellar region

Technique

Soft Tissue

Rationale

Direct soft tissue mobilization reduces local muscle tension, improves blood flow, and addresses reactive swelling. Effective for reducing pain and preparing tissue for subsequent loading.

Region

Quadriceps muscle group (rectus femoris, vastus medialis, vastus lateralis, vastus intermedius)

Technique

MET

Rationale

Muscle energy techniques reduce quadriceps dominance and tension, correcting biomechanical imbalances that overload the patellar tendon. Improved flexibility enhances force distribution and reduces patellofemoral compression.

Region

Hip abductors and external rotators (gluteus medius, maximus, piriformis)

Technique

Soft Tissue

Rationale

Hip weakness contributes to knee valgus and increased patellar tendon loading. Soft tissue treatment followed by activation improves motor control and reduces aberrant knee mechanics.

Region

Knee joint complex (tibiofemoral and patellofemoral joints)

Technique

Articulation

Rationale

Gentle articulation restores proprioception, reduces joint stiffness, and normalizes movement patterns. Enhances synovial fluid distribution and supports neuromuscular re-education.

Region

Ankle and calf complex (gastrocnemius, soleus)

Technique

MET

Rationale

Reduced ankle dorsiflexion increases compensatory knee loading. MET improves dorsiflexion ROM, reducing proximal compensation and patellar tendon stress.

Region

Thoracolumbar spine and lumbar region

Technique

Articulation

Rationale

Spinal dysfunction affects core stability and proprioception, contributing to lower limb compensation patterns. Restoring spinal mobility supports efficient movement and load management.

Add-On Approaches

Chinese Medicine

Acupuncture to GB34 (Yanglingquan), ST36 (Zusanli), and local ashi points around the knee to promote qi flow, reduce inflammation, and support healing. Moxibustion may support warming and circulation. TCM dietary recommendations emphasize warming foods and adequate protein for tissue repair.

Chiropractic

Joint mobilization of the patellofemoral joint, correction of knee valgus mechanics through adjustments, and assessment of lower kinetic chain alignment to address foot pronation or hip dysfunction affecting patellar tracking.

Physiotherapy

Progressive eccentric loading protocols (single-leg decline squats), progressive resistance training for hip abductors and external rotators, proprioceptive training, movement pattern retraining for landing mechanics, and graded return-to-sport protocols.

Remedial Massage

Deep tissue massage to quadriceps, hamstrings, and hip musculature to reduce tension; trigger point release targeting vastus medialis and medial hamstrings; cross-friction massage to patellar tendon insertion (in subacute/chronic phases); lymphatic drainage to reduce swelling.

Rehabilitation Exercises

Supine Knee Flexion with Hip Support

Range of MotionBeginner

Quadriceps Self-Stretch (Standing or Lying)

StretchingBeginner

Gastrocnemius and Soleus Calf Stretch (Wall-Supported)

StretchingBeginner

Figure-4 Hip Flexor and Piriformis Stretch

StretchingBeginner

Supine Gluteal Bridge (Bilateral)

StrengtheningBeginner

Side-Lying Hip Abduction

StrengtheningBeginner

Supine Quadriceps Isometric (VMO Emphasis)

StrengtheningBeginner

Eccentric Single-Leg Decline Squat (Progressive)

StrengtheningIntermediate

Single-Leg Hip Bridge (Gluteal Focus)

StrengtheningIntermediate

Single-Leg Stance with Hip Alignment Focus

PosturalIntermediate

Lateral Step-Down with Controlled Knee Valgus Prevention

BalanceIntermediate

Graded Return to Running Protocol (Walk-Jog Intervals)

CardiovascularAdvanced

Referral Criteria

  • •Suspected patellar tendon rupture (inability to extend knee, palpable defect, severe acute swelling)
  • •Signs of systemic inflammatory or infectious conditions
  • •Severe pain unresponsive to conservative management after 12 weeks
  • •Significant functional limitation affecting activities of daily living or work
  • •Chronic patellar tendinopathy with consideration for advanced imaging or injection-based interventions
  • •Comorbid pathology identified (meniscal lesion, cartilage damage, patellofemoral osteoarthritis)
  • •Neurological symptoms or progressive neurological deficit
  • •Severe psychological distress, depression, or anxiety interfering with rehabilitation compliance
  • •Need for specialist sports medicine assessment or consideration of surgical intervention
  • •Patient not progressing despite adherence to conservative management over 8-12 weeks