Many of the factors associated with an increased incidence of postoperative Patellar Crepitus such as shortened patellar tendon length, use of smaller patellar components, decreased patellar composite thickness, and increased posterior femoral condylar offset may all increase quadriceps tendon contact forces against the superior aspect of the intercondylar box, increasing...

Blazina et al first used the term jumper's knee in 1973 to describe an insertional tendinopathy seen in skeletally mature athletes. Jumper's knee usually affects the attachment of the patellar tendon to the inferior patellar pole. The definition was subsequently widened to include tendinopathy of the attachment of the quadriceps...

Edward T. Habermann, MD, Lester S. Borden, MD, FACS Anthony K. Hedley, MD, FRCS, David S. Hungerford, MD Kenneth A. Krackow, MD
Abstract: This retrospective study reviewed the results of 3,218 total knee arthroplasty cases using one total knee replacement system at five centers from July 1991 to October 1997....

Patellar height is associated with various clinical syndromes. We asked which of three methods was the most appropriate for measuring patellar height for different age groups in terms of applicability, validity, and reliability. We evaluated 108 children and adolescents with available MR images and lateral knee radiographs using Insall-Salvati (IS),...

The patellar tendon ruptures relatively infrequently. However, the complications of an untreated rupture to the extensor mechanism can be extremely disabling. Surgical intervention allows for excellent recovery of motion and strength, provided that the injury is diagnosed in a timely fashion and repaired immediately. The focus of this article is...

Patella tendon ruptures are less common than quadriceps tendon ruptures. They most commonly occur in patients younger than 40 years; whereas, quadriceps tendon ruptures tend to occur in individuals older than 40 years. Risk factors for patellar tendon ruptures include rheumatoid arthritis, diabetes mellitus, systemic lupus erythematosus, chronic renal failure,...

PATELLAR DISLOCATIONS:
* Most commonly due to twisting injury to knee.
* Only 10 % caused by direct trauma
* 24% incidence of positive family history of patellar dislocation
* Risk factors include:
  1. Shallow patellofemoral articular groove
  2. Patella alta
  3. Excessive Q angle
  4. Generalized ligamentous laxity
* Average age is 16- 20...

VCU Health System Pediatric Radiology Case of the Week
Disease Images, diagnosis, Treatment options
Pain, swelling, tenderness of inferior patellar pole at origin of the patellar tendon
Osteochondrosis involving the apex of the patella 10-14 years
Traction phenomenon - tendonitis proximal patellar tendon
Calcification and ossification on elongated inferior patellar pole
Natural...

See:
- Rupture of the Quadriceps:
- Patellar Tendon Injury:
- Tibial Tubercle Frx:
- Discussion:
- extensor mechanism includes quadriceps, quadriceps tendon, medial & lateral ...

Patellar dislocations are common, particularly in adolescent females and athletes. Patients usually present with an inability to extend an obviously deformed knee. A sizable effusion may also be seen. This injury may be due to direct trauma to the patella or a valgus stress combined with flexion and external rotation.
The...

- usually occur in pts under age of 40;
- most ruptures occur w/ the knee in a flexed position (around 60 deg) which are then subject to excessive loading;
- great majority occur at level of inferior patellar pole (> level of tibial...

- cause of discomfort in anterior aspect of the knee;
- caused by persistent traction at the cartilaginous junction of patella & patellar ligament, usually at inferior patellar pole;
- usually seen in an active preteen boy who complains of activity-related pain;
...

Soft tissue injuries of the knee are some of the most common and clinically challenging musculoskeletal disorders in patients presenting to the ED. Therefore, establishing clear-cut diagnostic and therapeutic objectives for these injuries is important. Knee pain and related symptoms may derive from damage to 1 or more of the soft...

- inflammation of patellar tendon second to repetive trauma (jumping sports);
- seen in athletes involved in running, jumping, and kicking sports;
- Occurs usually in skeletally mature adults, Age range 16 to 40 years, males slightly> females
...

There are no controlled, prospective studies comparing the 10-year outcomes of anterior cruciate ligament (ACL) reconstruction using patellar tendon (PT) and 4-strand hamstring tendon (HT) autografts.
Hypothesis: Comparable results are possible with HT and PT autografts.
Conclusions: It is possible to obtain excellent results with both HT and PT autografts. We recommend HT...

Traumatic Rupture of the Ipsilateral Quadriceps and Patellar Tendons: A “Floating Patella” Song, Frederick S, MD; Brody, Robert M. BS; Clarke, Sylvan E, MD; Raphael, James R, MD University of Pennsylvania Orthopaedic Journal Volume 19 2009

Conclusions The Roux-Elmslie-Trillat procedure could be recommended in cases presenting with an increased q-angle, trochlea dysplasia or failed soft tissue surgery. In the present study the majority of patients report a return to previous sporting activity ten years after surgery.
A 10 year follow-up study after Roux-Elmslie-Trillat treatment for cases of patellar...

Several primary types of patellar fractures have been identified, each with separate diagnostic, imaging, and management considerations. The primary types include transverse, vertical, marginal, and osteochondral fractures.
keywords - broken kneecap, broken patella, broken knee, kneecap fractures, knee fracture
Christine Lamoureux, MD 2007

Archive Copy 2004
19 yr old college basketball player with transverse patellar fx OCT 96, treated with cannulated 4.5 mm screw. Refracture playing B-ball in Jan 97 with the cannulated screw ripping through the proximal fragment. Fracture fixated with 2 transverse 3.5 mm screws and 2mm steinman pins with 18G tension...

Isolated fracture of the lateral condyle of the femur or Hoffa fracture is a rare lesion and has been reported to occur with supracondylar fracture of the femur, fracture of the femoral shaft and knee dislocation. We report a rare case of ipsilateral Hoffa fracture and patellar dislocation, which has...

Provides a presentation of knee fusion, patellar resurfacing, patellar complications and knee rehabilitation. Reviews the characteristics of the forces which are transmitted across the knee during its normal use in performing the activities of daily living. Johns Hopkins University.

Nail-patella syndrome (NPS; OMIM 161200) is a well-known autosomal dominant condition characterized by nail dysplasia, patellar aplasia-hypoplasia, arthrodysplasia of the elbows, iliac horns, and nephropathy. Recent reports indicate that open-angle glaucoma (OAG) may also cosegregate with NPS. One of the first chromosomal linkages identified in humans is between the NPS...

Sinding-Larsen-Johansson syndrome is inflammation of the kneecap (patella) at its lowest point. This is the site of origin of the patellar tendon. There is traction on the kneecap at this point due to action of the large, powerful thigh muscle (quadriceps), as well as with deep bending of the knee....

- Anatomy
- Biomechanics
- Classification of Patellar Fractures
- Osteochondral Frx
- Pediatric Patellar Avulsion Fractures

The extensor mechanism of the knee consists of the quadriceps muscle group, quadriceps tendon, patella, patellar retinaculum, patellar ligament, and adjacent soft tissues. Injuries to the extensor mechanism are common and consist of chronic degenerative injuries, overuse injuries, and acute trauma.
Timothy J Mosher, MD Updated: Dec 16, 2008