Knee-Final Lecture: Exam 2 Flashcards
Knee Jt. Sx
What do you NEED to keep in mind??
*AVOID overstressing what was done!
Tx Principles
- Avoid?
- Emphasize?
Tissue stress/Jt. Stress
- Symptom Mod. & Tissue Protection
- Movement Control
- Functional Optimization
-
Symptom Mod. & Tissue Protection
- LOAD IT CAREFULLY!
- Ex. in UPPER pt of maintenance, LOWER pt of hypertrophy
-
Movement Control
- LOAD IT THOROUGHLY
- Ex. in the hypertrophy zone, AVOIDING injury
-
Fxnl Optimization
- LOAD IT IN CONTEXT
- Ex. in NEW hypertrophy zone, AVOIDING injury

When in doubt….
W/ Knee Sx
- Get Op report
-
Repair vs. Reconstruction
- tells you about Tissue Quality
- YOU CAN ALWAYS MOBILIZE THE PATELLA
-
Get a good Isolated Quad Contraction!!!
- Quad sets—–hundreds!!!
- Stim the hell out of the Quad
- Extension to 0o
- GET THEM TO ZERO!!!
-
Repair vs. Reconstruction
Gen. Knee Sx
Phase 1: Symptom Mod. & Tissue Protection
Ranked (MOST important FIRST)
-
Protect the Sx
- Sx & Tissue specific cond’s
- Regain EXTENSION
- Restore Quadriceps Contraction
-
Regain FLEXION
- emphasize ability to transition from FLEX to EXT.
- DEC effusion/Inflammation
- Prevent atrophy of other mm’s
-
Normalize Gait
- *Actually MORE important than FLEX.
Tissue Protection Phase
GOALS:
- Restore ROM w/out over-stressing sx tissues
- Prevent mm atrophy and contractures
- Modify gait patterns to improve overall fxn
Tissue Protection Phase
Causes of Concern
*Not making progress + Immediate Referral
-
Concerning ROM Limits:
- Not achieving 0o by 4 wks
- Not achieving 90o by 4 wks
-
IMMEDIATE REFERRAL OUT:
-
10o FLEX contracture @ 6wks
- *compared to anatomic 0o
- Not achieving 90o by 12wks
- Consistent motion loss
- Symptomatic instability
-
10o FLEX contracture @ 6wks
Post-OP Brace & AD Use—Lig. Sx
Post-OP Orthosis
- Brace locked in EXT ~1 week
- Brace UNLOCKED after week 1 for ambulation and PT
- **IF quad lag has been resolved
-
Discharge brace when pt has:
- FULL passive hyperEXT (0o) AND @ least 90o of FLEX
- FULL Active EXTENSION
- “NORMAL” pain-free gait pattern
- Usually around 4-6wks
Post-OP Brace & AD Use—-Lig Sx
AD Use
- WBAT w/ crutches for first 4 wks
- SAME CRITERIA AS DISCHARGING BRACE
-
Begin weaning to 1 crutch and THEN discharge crutches when:
- 1. pt exhibits non-antalgic gait pattern
- Reaches FULL EXT @ Heel Strike
- Pt. does NOT display any INC in swelling
Restoring Quadriceps Function
SO IMPORTANT!!!!
- Pain + Effusion—> adversely affect quad function
- =====quad inhibition
- Quad activation failure===EXT. mech. disrupted
- quad tendon OR patellar tendon autografts
- Poor quad function ==> patellofemoral arthrofibrosis (stiff & sticky)
- GOOD quad function requires adequate patellar mobility******
- Restoration of quad function correlates w/ ADL fxn in EARLY STAGES OF RECOVERY
-
Quantity and Quality of exercise KEY to maint. and improving quad function
- 50 quad sets every hour you are awake!!!
- LOAD THEM!!!
- 50 quad sets every hour you are awake!!!
Restoring Quad Function
NMES Parameters
- 2500 Hz,
- 75 bursts/sec
- 10 contractions
- 10” ON/50” OFF
- Stim. produces full, sustained quad contract. w/ evidence of superior patellar glide

Therapeutic Ex. in Tissue Protection & Symptom Mod. Phase
Strength Training
-
NWB Quad Strengthening
- quad sets, SAQ, LAQ
-
WB Quad Strengthening
- TKE
- Step up/downs
- Squats
- use shorter ROM & GET FULL EXT***
- Leg Press
- shorter ROM & get FULL EXT. ***
- NMES
- Hips/Core/HS’s
Therapeutic Ex. in Tissue Protection & Symptom Modulation Phase
Functional Training
- GAIT TRAINING
- sequencing w/ AD—teach them
- 3-way Wt. Shifting
- Step and Holds—-Neuro
- Cycling for ROM
- Arc of motion to stretch
- 100-110o needed for full revolutions****
WB Strengthening???
Good, but not by itself!!!
- More “functional” BUT does NOT isolate the quad
- we NEED to get FULL EXT****
- Gen. safer for EARLY REHAB
- Reduce Ant. Shear Force—-after ACL
- INC tibiofemoral compression
- INC co-contraction of HS’s
- incorporates entire kinetic chain
- Element of proprioception
General Knee Sx Guidelines: Phase 2–Motor Control
in a nutshell…
Protect the Sx, INC load
**Sx and Tissue Specific Cond’s
Gen. Knee Sx Guidelines: Phase 2–Motor Control
-
Protect the Sx, INC load
- Sx & Tissue specific cond’s—-follow them!!!
- Maintain ROM
- Rehab LE mm’s
- lengthen+strengthen
- QUADS IS MOST IMPORTANT
- Hip/HS’s/Core
- Prevent recurrence of inflammation
- Condition CV system
- walking, bike
Therapeutic Ex in Motor Control Phase
Strengthening vs. Functional Training
Strength vs. Functional Training
see pics

Gen. Knee Sx Guidelines: Phase 3–Functional Optimization
PROTECT THE Sx
- Protect the Sx
- CV conditioning
-
Injury Prevention Tech’s while introduce:
- running
- agility training
- Optimize LE mm performance
-
Sport specific
- lengthen and strengthen
- QUADS IS MOST IMPORTANT***
-
Sport specific
- Prevent recurrence of inflammation
Criterion-based Rehab
Time and progression
- Time is a surrogate for healing
- Time after sx for graft healing
- Assess isolated strength, motor control, power dev.
- see if ready for next activity!!!
- Diff’s in force development and force absorption persist after sx and are indep. of time after sx
- MUST det. appropriate fxnl milestones to progress pts w/in PT
****What do you have to do to be ready for XYZ???****
EX. Criterion-based Rehab
“When can I run?”
A: When you are 12* (just ex.) weeks post-OP AND you can demo: a, b, c
Progression after Sx
what does this look like?
-
Irritability is progressing in the right direction:
- Inflamm==controlled
- Swelling==stable + NOT inc’ing w/ INC loading
- Pain==well controlled
-
Impairments are progressively improving
- ROM
- Strength
- Flexibility
- Pt. demo’s mastery of lower lvl activities
Progress to Straight Running
EXAMPLES:
- MD Clearance—- usually indicated in protocol
- Fast walking TM 15mins
-
Quad strength >80% vs. uninvolved
- EVIDENCE-BASED!!!
- Biodex
- 1-RM Knee Ext– 90-45deg
- 10 S/L Squats to 45deg in sagittal plane
- 30 step and holds
- >90% Composite Score on Y-Balance test
Progressing to Low-Lvl Agility Training
*moving out of Sagittal Plane
- MD clearance
-
Quad Strength >or= to 85%
- 1-RM on Knee Ext./Biodex
- 10 S/L squats to 60deg
- *w/ > or = 75% ext. wt.
- Tolerate 1-2mi TM running
- 100% Composite Score on Y-Balance Test
Progressing to Jumping
*2 feet
- MD Clearance
-
Quad strength > or = to 90%
- 1RM Knee Ext/Biodex
- 10 S/L squats
- w/ >or= 85% ext. wt vs uninvolved
- No compensation patterns displayed w/ agility training @ or near 100% speed.
Progress to Hopping, Sprinting, Cutting
*usually starts 50-75% effort
- MD Clearance
- 10 S/L squats w/ > or = to 90% ext. wt vs. uninvolved
- NO compensation patterns or medial collapse w/ jumps
Returning to Sport
When are they “Ready?”
ASK:“Is this person so unsafe that they cannot return to sport?”
- MD clearance
- Tolerating sprinting, agility drills, jumping, hopping @ 100% effort WITHOUT:
- Compensation strategies
- giving-way episodes
- INCd pain
- NEW S/S inflammation
- INCd effusion
-
FIRST return to practice and contact
- THEN return to games
Medial CORNER injury ====
BIGGER injury vs. just MCL
Lig. Sx.
Repair vs. Reconstruction
-
Repair
-
uses sutures and ligament is re-attached
- YOU MUST BE WAY MORE CAREFUL AS TO NOT FUCK UP THE REPAIR!!!!
- SEE PICS
-
uses sutures and ligament is re-attached
-
Reconstruction—move earlier, takes longer to heal
-
uses grafts and screws INTO BONE.
- anything into bone is MUCH stronger!!!
-
uses grafts and screws INTO BONE.
ACL Reconstruction
-
Primary Goal:
- restore stability + Knee kinematics to PREVENT future degen. changes
- 40-90% pts undergoing ALC-R have radiographic evidence of knee OA 7-12yrs AFTER Sx
- Anatomically performed
-
Graft failure ranges 0-27%
- based on activity lvl after Sx
- ***Returning to prev. lvl of sport NOT guarenteed****
ACL-Reconstruction
see pics in notability
Slide 16
- Single bundle procedure—-reconstruct AnteroMed bundle
- “Anatomic” double bundle procedure—reconstructs BOTH bundles into Anatomic Position
- Graft passed thru tunnels drilled into tibia and femur
- Drilled====strong!!!
***NOTE: single bundle procedure==NO spinning/rotation protection==meniscus + cartilage damage
Ligament Graft Healing
*gets WEAKER before STRONGER
- Initially—-graft is Avascular (no blood supply)
-
6-8wks: graft will show signs of avascular necrosis
- weaker BEFORE stronger!!!
- 8-12wks: revascularization begins; mesenchymal cells invade graft
- 16wks: vascularization complete; mesenchymal cells AND proliferation AND form collagen
- Collagen changes from fragments to dense longitudinally oriented fibers
-
6-8wks: graft will show signs of avascular necrosis
- ****Graft strength DECs during pd of necrosis and then it INCs as it remodels and matures
- DOES NOT REACH ORIG. STRENGTH OF NATIVE ACL
Autografts vs. Allografts
Auto===self
Allo==cadaver OR donor
Autografts
- FASTER incorporation and healing
- bc its YOURS!!!
- Better outcomes in young, active pts
- Donor-site morbidity?
- Risk of Fx?
*NOTE: commonly use semitendinosis (inserts @ PES) —–Semitendinosis is a MEDIAL STABILIZER to knee—-protects against valgus—-now you do not have that extra stabilizer—-bad for soccer players
Allografts
- Higher cost
- Predictable graft size
- Availability****
- Better for revisions
- Re-injury rate?
- HIGHER
- ****They don’t hurt enough!!!
- bc of this—–pt wants to do MORE TOO early
GOLD STANDARD ACL PROCEDURE
Bone-Patellar Tendon-Bone Autograft
BPTB
Bone-Patellar Tendon-Bone Autograft
BPTB
*Gold-Standard*
6-8wks to heal
- GOLD STANDARD ****
- Provides rigid bone to bone fixation which allows accelerated rehab to attain full ROM and Strength
- Boney plugs==heal approx. 6-8wks
- 30% pts complain donor-site moribidity
- ***Central 1/3 of tendon is 186% as strong as native ACL****
-
Patellar Fx
- NO aggressive strengthening for 6-8wks
- AVOID high eccentric loading for 12-16wks
-
Patellar Tendon Rupture
- Persistent extensor lag w/ SLR @ 4wks post-op
- Inability to perform SLR 1-2wks post-op
Hamstring Tendon Autograft (self)
*Falling out of favor***
*8-12wks to heal
- USUALLY semitendinosis/gracilis graft
- Semitendinosis== 70% strong as native ACL
- Gracilis== 49% strong as native ACL
- Fixation NOT AS STRONG as BPTB
- Potentially LESS quad atrophy
- LESS donor-site morbidity
- able to kneel
- BUT now you’ve disrupted HS’s== implications in injury prevent.
- **soft tissue-to-bone heals approx 8-12wks
Quad Tendon-Bone Autograft vs.
Quad Tendon Soft Tissue Autograft
- Stability similar (OR superior to) BPTP graft BUT w/ less kneeling pain
- Quads activation is poorer than other autografts
- Harvest site pain w/ contraction
- few long term studies
- Need to target rec fem while stretching and strengthening
Allografts
from cadaver or donor
usually what??
- USUALLY bone-patellar tendon-bone, Achilles, Tib. Ant.
- Mixed results for:
- failure rates
- laxity
- ROM outcomes
- Can allow for FASTER REHAB bc DECd pain
Post-OP ACL Rehab
CKC ex’s vs. OKC ex’s
- Generally, CKC ex’s cause LESS STRAIN vs. OKC
- 44 Subj’s randomized into CKC ex only vs. CKC and OKC ex’s following reconstruction w/ BPTB graft
- OKC ex’s initiated @ 6wks post-OP and in range of 90-40degs and progressed to 90-110degs by 12 wks post-OP
Post-Op Rehab
Generally, CKC ex’s cause LESS STRAIN vs. OKC
44 Subj’s randomized into CKC ex only vs. CKC and OKC ex’s following reconstruction w/ BPTB graft
OKC ex’s initiated @ 6wks post-OP and in range of 90-40degs and progressed to 90-110degs by 12 wks post-OP
- Results:
- NO sig. diff in ant. knee laxity @ 6mos
- Sig. INC in quads torque in CKC/OKC group
- Sig. HIGHER # pts returned to pre-injury lvl in CKC/OKC group and did so 2 mos EARLIER than CKC group
- Conclusion:
- Incorporate OKC ex’s WITH CKC’s in the protected ranges following ACL-Reconstruction
Acceptable OKC Quad Strengthening:
- Isometrics @ 90o and 60o
-
Long Arc Quads
- Weeks 0-12: 90-60degs
- Weeks 12-16: 90-45degs
- Weeks 16+: 90-0degs
-
Short Arc Quads
- 0-10degs does NOT put excess strain on ACL
- 0-30degs may NOT be approp. after ACL-R
Quad Strengthening
Patella
- GREATER axial strain on patella in GREATER DEGREES OF FLEX.
Risk Factors for Recurrent ACL-R
- Graft failure or contralat. ACL tears exceed 20% in young athletes returning to competitive sports
- Risk factors for recurrent ACL-R
- tech. failure in tunnel placement** or **graft position
- Contralat. ACL tear rates 6-9%
-
Higher rates w/ younger pop. + allograft use
- bc returning to sport===higher risk
Return to Sports w/ ACL-R
Where are we now?
- 1/3 pts return to same lvl of competitive sports 12mos after sx
- <50% pts return to sports 2-7yrs after sx
-
Young active pts are 6x MORE LIKELY to sustain 2nd ACL injury w/in 24 mos after ACLR and RTS vs healthy controls
- 20% contralat; 9% ipsilat.
Ardern CL. BJSM. 2014
Updated systematic review assessing RTS
- 81% (of 4837 pts) return to sport
- 65% return to pre-injury lvls of sport
- 55% return to competitive sports
-
MEN are 1.5 MORE LIKELY vs. females to return to pre-injury OR competitive lvls of sport
- bc DUMBER!!!
Rehab Considerations for Multiple Ligament Knee Injuries
MLKI’s
Controversies in Rehab
- Avail reports are biased, non-random., retrospective concerning rehab after sx for MLKI
- Timing and composition of rehab has not been researched
-
BEST EVIDENCE COMES FROM ACL-R
-
GOLD STANDARD:
- Early WB
- Early ROM
- Early Exercise
-
GOLD STANDARD:
Controversies in Rehabilitation
ACL-R vs. Sx for MLKI
-
ACL-R
-
Lvl 1 Evidence: better outcomes w/:
- EARLY WB
- EARLY ROM
- EARLY EXERCISE
-
Lvl 1 Evidence: better outcomes w/:
-
Sx for MLKI
-
Lvl 5 Evidence: questionable benefit, recommends:
- DELAYED WB
- DELAYED OR LIMTD ROM
- DELAYED EXERCISE
-
Lvl 5 Evidence: questionable benefit, recommends:
Criterion-Based Post-Sx Rehab Progression
GOALS:
- Return indiv. to normal ADLs
- Return to work, military duty, sports acts @ same lvl of participation as prior to injury
Criterion-Based Post-Sx Rehab Progression
Three phases of Post-OP Rehab
- Tissue Protection
- Motor Control
- Optimization of Function
“As Tolerated” Approach
General Recommendations
Look @ knee jt irritability table****
- Generally, keep pain 3/10 OR LESS
- Advance ROM w/out OP/stretching
- end range mobs + stretching @ >4wks
- WBAT w/ crutches****
- Exercise w/out INCing irritability
Know the Surgery. Respect the Surgery.
Know the surgeon. Respect the surgeon.
“In preparing for battle I have always found that plans are useless, but planning is indespensable.”
-Dwight D. Eisenhower
Phase 1: Tissue Protection Phase
Evidence Supporting ROM Recommendations
- Early motion is @ least equivalent to immobilization
-
MLKIs
- Early sxandEarly motionled tofewer ROM deficits
-
ACL
- ESP in combined procedures
- may lead to tunnel widening
- PCL
-
MLKIs
Phase 1: Tissue Protection Phase
Practical Application of ROM Exercise
- PROM w/in avail. range
- AROM pending tissue restricts.
- Pain and tissue stretch are guidelines for intenisty of ROM
-
Patellar mobs in NEUTRAL
- can ALWAYS mobilize the patella!!!
- Positioning in EXT w/ tibial support to avoid over-stressing repairs
- Cycling for ROM
- Week 3—mod. irritability–0-90deg
Phase 1: Tissue Protection Phase
Evidence Supporting WB Status
- Controlled Gait Lab
- training w/ bathroom scale to a clinically variable % of BW
- ***21 of 23 pts w/ Fx bore TOO MUCH WT
- 3% to 163%
- No diffs after ACL-R
Phase 1: Tissue Protection Phase
Evidence Supporting WB Status:
- controlled gait lab
- NO diffs after ACL-R
- PWB/TTWB gen. not supported
-
No data on NWB in MLKIs
- may be surgeon preference
Phase 1: Tissue Protection Phase
Practical Application of WB
- NWB vs. WBAT w/ crutches WITH brace locked in EXT
- does NOT mean FWB is promoted
- consider S/S of inflamm & irritability
- adjust as necessary
- Crutch Use== MIN. of 3wks
- Brace Use== MIN of 6wks
Tissue Specific Protections: PCL
OFTEN reconstructed OR repaired
PCL Injury, Reconstruction or Repair
- WBAT w/ brace and crutches
- Restricted ROM—-AVOID HYPEREXTENSION!
- GOAL: anatomic 0 (neutral) EARLY—maint. for 4-8wks
- GOAL: 90degs w/out excess. post. tibial sublux
- AVOID POST. TIBIAL GLIDES FOR FLEXION!
-
Therapeutic Ex—Care for HS TEs
- AVOID NWB, non-resisted ex. for 8wks
- *ADD resistance @ 12wks
Tissue Specific Precautions: Lateral Corner
PLC Injury, Reconstruction, Repair
- WBAT w/ brace AND crutches
- Restricted ROM:
- GOAL: anatomic 0 (neutral) EARLY, avoid HYPEREXTENSION
- GOAL: 90degs w/out excess. post. tibial subluxation
- No VARUS force, tibial rotation, and post. tibial glides ******
PLC Reconstruction
- after acute injuries—–repair typ. done w/in 3 wks to avoid tissue retraction, tissue necrosis
-
Chronic PLC injuries— MORE diff. to repair due to excess. scarring
- therefore, reconstruction performed
- LCL reconstructions—usually use semitendinosis autografts
Tissue Specific Precautions:
Medial Corner
Medial Corner Injury, Reconstruction, Repair
- WBAT w/ brace and crutches
- Restricted ROM:
- GOAL: anatomic 0 (neutral) EARLY, may avoid hyperEXT completely bc capsular involve.
- GOAL: 90deg w/out excessive valgus forces/tibial ER
-
TherEX
- care for HS TE’s if possible
- avoid valgus forces
- watch semimembranosus
Tissue Specific Protections:
HS Considerations
Active Posterior Drawer
- if contraction of HS’s causes visible post. dislocation or sublux. or tibia====> insuff. healing of PCL or PLC
- refer back to surgeon
- If this causes sig. pain after HS repair===> incomp. healing
Tissue Specific Protections:
HS Considerations
Non-resisted HS Ex.
- 8 wks post-sx
- heel slides
- Prone HS curls
- standing HS curls
- prone glute press
Tissue Specific Restrictions:
Meniscus Repair
- Meniscus BODY repair has equivocal outcomes w/ EARLY WB and motion compared to DELAYED WB and motion*****
- Meniscus ROOT repairs are HIGHLY STRESSED IN WB—leading to greater risk of failure
Tissue Specific Restrictions
Cartilage Sx
- current concepts based on combo of basic science data, sx tech’s current. avail., empirical info., limtd # clinical studies
- Rehab reporting scores LOWER than their surgical equivalent
Tissue Specific Restrictions:
Peroneal N. Injuries
- 10.8% of MLKIs
- reasonably common
- consider HOW injury is affecting function
Tissue Specific Restrictions:
Tibial Artery Injuries
- 3.3% of MLKIs
- rel. UNcommon
- Consider extent of repair and intervention
- PREVENT over-stressing
- monitor S/S of compromised circulation