01Approach to the Critical Patient/attcp37

Immediate priorities

›Red flag recognition

›Night pain or rest pain

›Osteoid osteoma consideration

›Osteosarcoma consideration

›Systemic symptoms

›Fever, weight loss, night sweats

›Malignancy or infection concern

›Acute onset with inability to bear weight

›Tibial tubercle avulsion fracture concern

›Urgent imaging required

›Joint effusion or warmth

›Septic arthritis consideration

›JIA or reactive arthritis consideration

Stabilization approach

›Triage and risk stratification

›Classic OSD presentation

›Adolescent athlete with focal tibial tubercle tenderness

›Activity-related anterior knee pain, no systemic features

›If avulsion fracture suspected, immobilize and obtain imaging

›Forceful quadriceps contraction mechanism

›Inability to actively extend knee

›If septic arthritis suspected, emergent workup

›CBC, ESR, CRP, blood cultures, joint aspiration

›Orthopedic consultation

›Reassure and initiate conservative plan for typical OSD

›Activity modification, ice, analgesia

›Self-limiting condition with >90% recovery rate

02History/hx59

Presentation pattern

›Core symptoms

›Anterior knee pain localized to the tibial tubercle

›Insidious onset over weeks to months

›Average duration before diagnosis ~6.7 months

›Activity-related pain pattern

›Running, jumping, squatting, kneeling, stair climbing

›Pain during or after sports activity

›Localized swelling over the tibial tubercle

›Palpable bony prominence

›Bilateral involvement in 20-43% of cases

Risk factors

›Demographic and developmental factors

›Age and sex

›Boys 12-15 years

›Girls 10-12 years due to earlier skeletal maturation

›Active growth spurt

›Rapid longitudinal growth increases traction stress on apophysis

›Symptoms often first manifest during growth spurts

›Sports participation

›Running and jumping sports: soccer, basketball, track and field, volleyball, martial arts

›High training volume or recent increase in training intensity

›Biomechanical risk factors

›Quadriceps tightness

›Especially rectus femoris shortening

›Hamstring tightness also contributory

›Muscle weakness

›Decreased knee extension strength

03Physical Exam/exam42

Focused knee examination

›Inspection

›Visible swelling or bony prominence over tibial tubercle

›Asymmetry versus contralateral knee

›Bilateral tubercle prominence common

›Gait

›Antalgic limp

›Avoidance of full knee flexion

Palpation and provocation

›Hallmark finding

›Point tenderness directly over the tibial tubercle

›Hallmark finding of OSD

›Differentiate from patellar pole or patellar tendon tenderness

›Resisted knee extension pain reproduction

›Pain at the tibial tubercle with resisted extension

›Distinguishes from patellofemoral pain syndrome

›Range of motion

›Usually full range of motion

›May have pain-limited knee flexion in severe cases

Flexibility and functional assessment

›Muscle flexibility tests

›Ely test

›Prone position, flex knee passively

›Ipsilateral hip flexion indicates tight rectus femoris

›90/90 hamstring test

›Supine, hip at 90 degrees, extend knee

›Hamstring flexibility quantification

›Thomas test

04Differential Diagnosis/ddx50

Apophysitis and tendinopathy mimics

›Closely related conditions

›Sinding-Larsen-Johansson disease

›ICD-10 M92.4

›Apophysitis at inferior pole of patella

›Tenderness at patellar tendon-patella junction, not tibial tubercle

›Patellofemoral pain syndrome

›ICD-10 M22.2

›Diffuse anterior or retropatellar pain

›Theater sign: worse with prolonged sitting

›Patellar tendinopathy

›ICD-10 M76.5

›Pain at inferior patellar pole

›Common in jumping athletes

Structural and traumatic diagnoses

›Bony and cartilaginous injuries

›Tibial tubercle avulsion fracture

›ICD-10 S82.101

›Acute onset after forceful quadriceps contraction

›Inability to actively extend knee

›Requires urgent orthopedic evaluation

›Stress fracture of proximal tibia

›ICD-10 M84.362

›Point tenderness along tibial shaft

›Insidious onset, progressive

Cannot-miss diagnoses

›Serious pathology requiring exclusion

›Osteosarcoma

05Laboratory Tests/lt34

Standard workup

›Labs not routinely indicated for classic OSD

›Clinical diagnosis based on history and physical exam

›No labs required in typical adolescent athlete presentation

›Reserve labs for atypical features or red flags

Inflammatory workup

›Red flag driven laboratory testing

›Complete blood count with differential

›Leukocytosis for infection or malignancy

›Leukopenia in severe sepsis or immunocompromise

›Erythrocyte sedimentation rate

›Elevated in infection, JIA, malignancy

›Non-specific but sensitive for systemic inflammation

›C-reactive protein

›More rapid response than ESR

›Serial trending for treatment monitoring

›Blood cultures

›If septic arthritis or osteomyelitis suspected

›Before antibiotic administration when feasible

Bone and tumor markers

›Malignancy workup when suspected

›Lactate dehydrogenase

›Elevated in osteosarcoma and lymphoma

›Non-specific

›Alkaline phosphatase

›Elevated in bony tumors and active bone growth

›Interpret in context of adolescent growth

›Uric acid

06Diagnostic Tests/dt68

Scoring Systems

›Functional outcome tools

›No validated scoring system specific to OSD

›Clinical diagnosis does not require a scoring tool

›Severity stratification by symptoms: mild/moderate/severe

›IKDC Subjective Knee Form

›Used for functional assessment in research settings

›Broad knee function questionnaire

›Lysholm Knee Scoring Scale

›Limp, locking, instability, pain, swelling, stair climbing, squatting, support

›Used for longitudinal functional monitoring

›Severity stratification framework

›Mild

›Pain only with vigorous activity

›Does not limit participation

›Moderate

›Pain with daily activities

›Some functional limitation

›Severe

›Constant pain limiting basic function

›Significant sport and activity restriction

MRI

›MRI indications and findings

›Rarely indicated for typical OSD

›Clinical diagnosis sufficient in typical adolescent athlete

›Reserve for diagnostic uncertainty or red flags

›Indications for MRI

›Concern for osteosarcoma or osteomyelitis

07Disposition/dispo30

Outpatient management

›Discharge criteria for typical OSD

›Clinical diagnosis confirmed

›Typical history and focal tibial tubercle tenderness

›No red flag features

›Pain adequately managed

›NSAIDs or acetaminophen sufficient

›Activity modification plan in place

›Conservative management plan established

›Activity modification instructions provided

›Ice and stretching program explained

›Follow-up arranged within 4-6 weeks

Follow-up plan

›Outpatient follow-up

›Reassess at 4-6 weeks

›Expect 3-6 months for full recovery with conservative management

›50% symptom-free by 16 months, 75% by 25 months

›Physical therapy referral

›Quadriceps and hamstring stretching program

›Progressive strengthening and return-to-sport guidance

›Sports medicine or orthopedics referral triggers

›Symptoms persisting >6 months despite conservative management

›Symptoms persisting after physeal closure

›Significant functional limitation

Admission indications

›Criteria for escalated care

›Alternative serious diagnosis suspected

›Septic arthritis: joint aspiration, IV antibiotics, orthopedics

08Treatment/t74

Conservative management

›First-line approach: successful in >90% of patients

›Activity modification

›Reduce or modify aggravating activities

›Pain-guided return to sport rather than complete rest

›Low-impact alternatives: swimming, cycling

›Ice application

›Apply to tibial tubercle after activity

›15-20 minutes per session

›Protective equipment

›Infrapatellar tendon strap or patellar tendon taping

›May offload the tibial tubercle during activity

›Knee pad for sports involving kneeling or contact

Analgesia

›Pharmacologic pain management

›NSAIDs: first-line for pain relief

›Ibuprofen 200-400 mg PO every 6-8 hours with food

›Maximum 1200 mg/day for self-medication; up to 2400 mg/day clinician supervised

›Short courses for pain flares; avoid chronic use

›Naproxen 250-500 mg PO every 12 hours

›Maximum 1000 mg/day

›GI protection with food or antacid

›Acetaminophen: alternative or adjunct

›500-1000 mg PO every 4-6 hours

›Maximum 4 g/day in adults; 75 mg/kg/day in children (max 4 g/day)

›Useful when NSAIDs contraindicated or as add-on

›Contraindicated: corticosteroid injections

›Into patellar tendon or tibial tubercle not recommended

›Risk of tendon weakening and avulsion fracture

›No high-quality evidence supports injection therapy for apophysitis

Physical therapy

›Rehabilitation program: cornerstone of treatment

›Stretching program

›Quadriceps stretching (especially rectus femoris)

›Prone knee flexion stretch held 30-60 seconds, 3 sets daily

›Standing quadriceps stretch with pelvic tilt

›Hamstring stretching

›Supine hamstring stretch held 30 seconds, 3 repetitions

›Progressive frequency as flexibility improves

›Progressive strengthening

›Quadriceps strengthening

›Begin with open chain exercises when pain allows

›Progress to closed chain: wall squats, leg press

›Hip abductor and core strengthening

›Side-lying hip abduction

›Core stabilization exercises

›Neuromuscular training

›Dynamic valgus control exercises

›Single-leg balance and proprioception training

Return to sport

›Graduated return-to-sport progression

›Stage 1: low-impact activity

›Walking, swimming, stationary cycling

›Pain-free at rest required before advancing

›Stage 2: moderate-impact activity

›Light jogging, controlled directional movement

›Pain during activity should not exceed 3/10 on numeric pain scale

›Stage 3: sport-specific training

›Drills without contact

›Gradual increase in running volume and intensity

›Stage 4: full sport participation

›Full training and competition

›Expected return to full sport in 3-6 months with conservative management

›Pain-guided progression

›If pain >3/10 during activity, step back one stage

›Pain must resolve within 24 hours of activity to advance

Surgical treatment

›Reserved for refractory cases after physeal closure

›Indications

›Persistent debilitating symptoms after growth plate closure

›Painful ossicle not responsive to conservative management

›Less than 10% of patients require surgery

›Surgical options

›Ossicle excision

›Tibial tubercle debridement

›Removal of free cartilaginous bodies

›Referral

›Pediatric orthopedics or sports medicine

›Refractory cases or significant functional limitation

09Special Populations/sp47

Pregnancy

›Pregnancy considerations

›OSD is a condition of adolescent skeletally immature patients

›Pregnancy in an adolescent with OSD is possible

›OSD symptoms typically resolve with skeletal maturity before or during pregnancy

›Pharmacologic considerations

›NSAIDs avoided in third trimester

›Risk of premature closure of ductus arteriosus

›Risk of oligohydramnios

›Acetaminophen preferred analgesic in pregnancy

›500-1000 mg PO every 4-6 hours, maximum 3 g/day in pregnancy

›Non-pharmacologic management preferred in pregnancy

›Activity modification, ice, physiotherapy

›Patellar tendon strap as adjunct

Geriatric

›Geriatric considerations

›OSD is rare in older adults

›Residual tibial tubercle prominence may persist as painless cosmetic finding

›Residual discomfort with kneeling reported in ~78.8% long-term

›Painful ossicle in older adults with prior OSD

›Persistent ossicle may cause local pain with kneeling

›Surgical ossicle excision effective in symptomatic cases

›Differential broadens in older adults

›Patellar tendinopathy more common in adults

›Knee osteoarthritis

›Prepatellar bursitis

Pediatrics

›Pediatric-specific considerations

10Background/b68

Epidemiology

›Incidence and prevalence

›One of the most common causes of anterior knee pain in children and adolescents

›Age range 10-15 years

›Boys 12-15 years; girls 10-12 years

›Prevalence higher in athletic adolescents

›Running and jumping sports most commonly affected: soccer, basketball, track and field

›Bilateral involvement in 20-43% of cases

›Natural history

›Self-limiting condition resolving with skeletal maturity

›Conservative management successful in >90% of patients

›Complete recovery expected with closure of tibial growth plate

›Outcome data

›Average symptom duration before diagnosis ~6.7 months

›Functional symptoms last average 19.1 months (range 3-48 months)

›50% symptom-free by 16 months, 75% by 25 months

›Long-term complications

›~10% develop persistent painful ossicle after skeletal maturity

›~78.8% report persistent discomfort with kneeling long-term

›Residual tibial tubercle prominence cosmetically common and painless

›~28% switch sports due to OSD

Pathophysiology

›Mechanism of injury

›Traction apophysitis of the tibial tubercle

›Repetitive traction stress from the patellar tendon on the tibial apophysis

›Occurs during running, jumping, and kneeling in skeletally immature patients

›Skeletal immaturity as predisposing factor

›Tibial apophysis is cartilaginous and weaker than bone in adolescents

›Rapid longitudinal growth increases traction stress on the apophysis

›Growth spurt creates relative muscle-tendon tightness

›Quadriceps-patellar tendon-tibial tubercle unit

›Repetitive microtrauma from quadriceps contraction

›Partial avulsion and subsequent heterotopic ossification

›Irregular cartilaginous fragmentation of the apophysis

›Tissue changes

›Acute phase

›Inflammation of tibial apophysis and adjacent soft tissue

›Tendinosis of distal patellar tendon

›Infrapatellar bursitis

›Chronic phase

›Irregular ossification and heterotopic bone formation

›Persistent ossicle formation at tibial tubercle

›Residual bony prominence after physeal closure

›ICD-10 classification

›M92.5 Juvenile osteochondrosis of tibia and fibula

›SNOMED CT: 72047000 Osgood-Schlatter disease

Therapeutic Considerations

›Conservative management evidence base

›Activity modification is cornerstone of treatment

›Pain-guided return to sport rather than complete rest

›Rest reduces pain but does not accelerate resolution

›Physical therapy evidence

›Quadriceps and hamstring stretching reduce traction stress

›Progressive strengthening addresses underlying biomechanical risk factors

›Neuromuscular training improves lower limb mechanics

›NSAID evidence

›Short courses effective for pain management during flares

›Chronic NSAID use not supported for long-term management

›No evidence that NSAIDs alter natural history

›Injection therapy evidence

›Corticosteroid injections not recommended

›No high-quality evidence supporting injection therapy for apophysitis

›Risk of patellar tendon weakening and avulsion fracture

›Platelet-rich plasma (PRP) emerging but unproven

›Limited evidence in OSD specifically

›Reserve for refractory cases under specialist guidance

›Surgical considerations

›Reserved for <10% of patients

›Persistent symptomatic ossicle after physeal closure

›Ossicle excision and tibial tubercle debridement effective

›Excellent outcomes when performed after skeletal maturity

11Patient Discharge Instructions/pdi30

copy discharge instructions

›What is Osgood-Schlatter Disease?

›Pain and swelling below the kneecap at the bony bump on the lower leg (tibial tubercle)

›Caused by repetitive stress on a growth area during rapid growth in active adolescents

›A self-limiting condition that heals as bones mature; full recovery expected

›Activity modification

›Reduce high-impact activities that cause pain: running, jumping, kneeling

›Stay active with low-impact alternatives: swimming, cycling, walking

›Return to sports gradually when pain allows; pain >3/10 during activity means slow down

›Wear a patellar tendon strap or knee pad during sports if it helps

›Ice and pain relief

›Ice the tibial tubercle for 15-20 minutes after activity

›Ibuprofen or naproxen for pain flares (take with food as directed)

›Acetaminophen as an alternative

›Do NOT have a cortisone injection into the knee for this condition

›Stretching home program

›Quadriceps stretch: stand, bend knee behind you, hold ankle 30-60 seconds each leg

›Hamstring stretch: sitting, straighten one leg, reach toward toes, hold 30 seconds

›Perform stretches twice daily

›Warning signs to return to the emergency department

›Sudden severe knee pain after a forceful jump or kick

›Inability to straighten the knee actively

›Significant swelling, warmth, or redness of the knee joint

›Fever with knee pain

›Pain at rest or night pain that wakes you from sleep

›Pain not improving despite 6-8 weeks of conservative management

›Follow-up

›Family doctor or sports medicine clinic in 4-6 weeks

12References/r22

Guidelines and key sources

›Primary evidence sources

›Ladenhauf HN, Seitlinger G, Green DW. Osgood-Schlatter Disease: A 2020 Update of a Common Knee Condition in Children. Current Opinion in Pediatrics. 2020. PMID 31714260

›Comprehensive review of epidemiology, pathophysiology, and management

›Conservative management successful in >90% of patients; surgery reserved for <10%

›Gholve PA, Scher DM, Khakharia S, Widmann RF, Green DW. Osgood Schlatter Syndrome. Current Opinion in Pediatrics. 2007. PMID 17224661

›Bilateral involvement 20-43%; average functional symptoms 19.1 months

›Risk factors including sport type and growth spurt

›Gaulrapp H, Nührenbörger C. The Osgood-Schlatter Disease: A Large Clinical Series With Evaluation of Risk Factors, Natural Course, and Outcomes. International Orthopaedics. 2022. PMID 34427770

›Large cohort data on natural course and NSAID use

›Corticosteroid injections not recommended

›Supporting clinical references

›Lintner LJ, Swisher J, Sitton ZE. Childhood and Adolescent Sports-Related Overuse Injuries. American Family Physician. 2023. PMID 38215415

›Red flag identification and differential diagnosis in adolescent knee pain

›Hip examination mandatory in all adolescents with knee pain

›Lyng KD, Rathleff MS, Dean BJF, Kluzek S, Holden S. Current management strategies in Osgood Schlatter. Scandinavian Journal of Medicine and Science in Sports. 2020. DOI 10.1111/sms.13751

›Cross-sectional study of management strategies in clinical practice

›Achar S, Yamanaka J. Apophysitis and Osteochondrosis: Common Causes of Pain in Growing Bones. American Family Physician. 2019. PMID 31083875

›Overview of apophysitis conditions including OSD management

›Duong V, Oo WM, Ding C, Culvenor AG, Hunter DJ. Evaluation and Treatment of Knee Pain: A Review. JAMA. 2023

›Broad knee pain evaluation framework including OSD

›Hansen R, Rathleff MS, Lundgaard-Nielsen M, Holden S. The development of an informative leaflet for children and adolescents suffering from Osgood-Schlatter disease. Scandinavian Journal of Medicine and Science in Sports. 2023. DOI 10.1111/sms.14498

›Patient education framework for OSD

Evidence & Review

Evidence & Review