CASE HISTORY 2 ® THE KNEE
SUBJECTIVE
Pathology:
NOTE BACKROUND- when looking at this case study there is two key components to note.
Osteoarthritis
Patella-femoral joint
In this case study the patient is diagnosed with early osteoarthritis of the patella femoral joint.
The patient is definitely suffering from patella-femoral syndrome. This can be caused by a various number of factors.
One of the special Q’s asked in knee pain is “do you experience pain on ascending or descending stairs”.
If yes, like in this case study then the patient has patella femoral syndrome.
Also the pain is experienced in the front/anterior part of the knee.
And comes from behind and below the knee.
This correlates to the symptoms of the syndrome.
OA is caused by trauma (sudden fall/accident) and genetics.
The patient’s subjective assessment states no family history of OA and also says that no trauma was suffered.
However OA and patella femoral syndrome can both develop as a result of repetitive microtrauma (overuse)
This patient has an active lifestyle including sports and gym activities. This syndrome can affect overzealous (excessively enthuasiastic) recreational athletes.
Therefore it is the overuse of muscle’s which results in muscle weakness and tightness. This muscle weakness can lead to a tracking problem of the patella, leading to patella femoral syndrome. (explained below)
OA is described as being caused by “wear and tear”, so the repetitive activities accounts for this.
However I asked gerr if the patella femoral syndrome could lead to OA and he said yes. Im goin to double check with him asap. So I think bout pathologys are acceptable- microtrauma (overuse) and the contd effects of patella femoral syndrome.
PATELLA FEMORAL- ANATOMY AND BIOMECHANICS:
The patello-femoral joint refers to a specific part of the knee joint.
It is the joint space between the patella and the femur.
The patella is connected to the quadriceps tendon at the top of the patella.
The quadriceps tendon attaches to the quadriceps muscle which attaches to the pelvis.
The patellar tendon goes from the bottom of the patella to the front of the tibia known as the tibial tubercle.
When the quadriceps muscle contracts (shortens), it pulls the patella which in turns pulls on the tibial tubercle, which causes the knee to straighten (go into extension).
As the knee moves, the patella glides across the front of the knee joint in a shallow groove on the front of the femur which is known as the trochlear groove of the femur.
Abnormalities that occur at the patella:
1. dislocate (slip out of place)
2. sublux (partially slip out of place),
3. fracture,
4. develop degenerative arthritis,
5. develop a tracking problem.
A tracking problem refers to the fact that the patella remains in front of the knee, but it no longer remains centered in the front part of the femur known as the trochlear groove.
4 and 5 are to be focused on in this case study.
The tracking problem has develop due to overuse, leading to muscle weakness and therefore muscle imbalance.
PATHOLOGY
· When tracking problems occur, the kneecap develops an abnormal set of biomechanics that results in abnormally increased pressure on the underside of the patella (patellar articular surface).
· Normally, the patella sits centered in the groove.
· However, if it begins to move towards one side of the groove, the amount of pressure on the underside of the kneecap (patellar articular surface), changes.
· This results in the development of pain
· The centering of the patella in the trochlear groove is related to the strength of the vastus medialis obliqus (a part of the vastus medialis muscle) and the medial patello-femoral ligaments which pulls the patella towards the opposite knee while the vastus lateralis and lateral patello-femoral ligaments pull the knee cap towards the outside (lateral) aspect of the knee.
· When all of these forces are in proper alignment, the patella is centered in the trochlear groove of the femur.
· If an imbalance develops with weakness of the vastus medialis muscle and/or weakness of the medial patello-femoral ligaments and/or over-development of the vastus lateralis muscle and/or tightness of the lateral ligaments of the patello-femoral joint, then a force imbalance develops.
· When this happens, the patella begins to move laterally (towards the outside) within the trochlear groove.
· As the knee flexes, the tension increases on the tight lateral structures. In turn, this causes pain with bent knee activities.
· This results in abnormally increased contact between the femur and the patellar articular surface which may eventually result in arthritis. If the imbalance is overwhelming, then the patella may actually slip out of place (dislocate).
OSTEOARTHRITIS:
Pathology:
Osteoarthritis often called degenerative arthritis or OA. OA is low-grade inflammation of the joint caused by degeneration and damage to the cartilage. It is commonly referred to as “wear and tear”. The cartilage covers the area of bone that meets the joint and acts as a ‘cushion’. In osteoarthritis, the surface of the cartilage becomes roughened, fissured and even starts to shred into small fragments. These fragments "float" around the joint and cause more damage. The bone tries to protect itself by producing small bony prominences called osteophytes which actually in the end cause the joint damage and pain worse.
Any kind of sports participation can increase the incidence of osteoarthritis due to increased twisting forces, high impact, muscle weakness or over-development and joint instability which causes abnormal peak pressures and greater stress in certain areas of cartilage which can lead to osteoarthritis.OA commonly affects the knee as it is a large weight bearing joint.
two types:
primary- related to aging (cartilage losses water becomes less resilient)
secondary-caused by another pathology (patella-femoral syndrome)
Signs and symptoms:
· It causes acute pain
· restricted movement
· stiffness around the knee This can occur due to the decrease in smooth glide between the bones which was once provided by the cartilage.
· The symptoms are commonly accompanied by swelling, creaking and grating noises.
· sharp pain
· burning sensation can also be felt. This pain is felt in associated muscles and tendons.
· Pain on flexion
· Pain on ascending stairs
A lot of the symptoms are caused by inflammation (heat, swelling etc)
Aggravating factors:
Patient: what is said in the case history
Additional: other expected symptoms that arent in case history but are likely to be present.
Patient: Varies between activities. Particularly sharp on ascending stairs and sometimes kneeling.
Additional: Prolonged rest is determental to OA by causing stiffness and muscle weakness.
Sitting with flexed knees can also bring on sysmtoms due to the increased pressure between the patella and femur.
Easing factors:
Patient: No pain during walking.
Additional This is because gentle exercise will not cause joints to wear. Regular walks can reduce joint stiffness and keep associative muscles strong.
Mechanism of injury:
Patient: no trauma or genetics mentioned
Conclusion: progressive onset caused by various contributing factors including microtrauma and patella femoral syndrome.
( consenus on cause is not yet agreed in medical world)
patellafemoral joint overuse and dysfunction
biomechanical problems
muscular dysfunction
OBJECTIVE
Physio likely to see:
Restricted movement
Stiffness
Swelling
Grating noises
Tests:
During the physical exam a number of areas are checked
1. tracking of the patella
2. strength of the muscles around the knee cap,
3. tightness of the tissue and ligaments around the kneecap,
4. areas of tenderness in the soft tissue,
5. areas of tenderness on the underside of the patella, the location of the patella, med and lat displace patella and palpate undersurface
6. the presence of abnormal grinding of the patella as it moves
7. the ability of the patella to be subluxed or dislocated.
8. grasp both sides of the patella and ask patient to contract quadriceps- discomfort
9. check for heat
Ask patient to actively flex and extend at knee joint
Then passively flex and extend at the knee joint
Flexion 0-135 degrees +
Extension 0 degrees
Apply resisted tests through static flexion and extension
Apply resisted tests through full rom of flexion and extension
Noting at what rom the patient is weak and symptoms are produced
Palpate knee to exam any abnormalities, differences or heat
Things to look for:
High positioned patella
Foot hyperpronation in walk or stand (biomechanical problem)
Atrophy vastus medialis
Increase Q angle
Patients feet together- note if valgus or varus
View from side- hyperextending or not (quad weakness)
Fairbanks apprehension test:
Tests patellar subluxation and dislocation
Procedure ® patient supine with knee in 30 degrees flexion and quads relaxed. Passively glide patella laterally
Positive sign ® patient apprehension or excessive mvt