high riding patella

Patella alta

• Transient lateral patellar dislocation - Ganzer Fall bei Radiopaedia

Jaray A, Transient lateral patellar dislocation. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-74801 • CC by-nc-sa 3.0 (modified)

Patella alta

• Medial patellofemoral ligament avulsion injury - Ganzer Fall bei Radiopaedia

Feger J, Medial patellofemoral ligament avulsion injury. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-75668 • CC by-nc-sa 3.0 (modified)

Patella alta

• Patella alta - Ganzer Fall bei Radiopaedia

Patel M, Patella alta. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-10156 • CC by-nc-sa 3.0 (modified)

Patella alta

• Patella alta - Ganzer Fall bei Radiopaedia

Mourits M, Patella alta. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-14476 • CC by-nc-sa 3.0 (modified)

Patella alta

• Patellar tendon rupture - Ganzer Fall bei Radiopaedia

Gaillard F, Patellar tendon rupture. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-7514 • CC by-nc-sa 3.0 (modified)

Patella alta

• Patella alta - Ganzer Fall bei Radiopaedia

Al Khateeb A, Patella alta. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-44943 • CC by-nc-sa 3.0 (modified)

Patella alta

• Patella alta from patellar tendon rupture - Ganzer Fall bei Radiopaedia

Radswiki T, Patella alta from patellar tendon rupture. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-11743 • CC by-nc-sa 3.0 (modified)

Patella alta

• Patella alta with Hoffa's fat pad impingement - Ganzer Fall bei Radiopaedia

Schubert R, Patella alta with Hoffa's fat pad impingement. Case study, Radiopaedia.org (Accessed on 28 Nov 2022) https://doi.org/10.53347/rID-25157 • CC by-nc-sa 3.0 (modified)

Patella alta

• Patella alta (high riding patella) - Ganzer Fall bei Radiopaedia

Czarniecki M, Patella alta (high riding patella). Case study, Radiopaedia.org (Accessed on 30 Nov 2022) https://doi.org/10.53347/rID-28201 • CC by-nc-sa 3.0 (modified)

Radiopaedia • CC-by-nc-sa 3.0 • de

Patella alta, or a high riding patella, describes a situation where the position of the patella is considered high. It may be idiopathic or may result secondary to a patellar tendon rupture.

Epidemiology

Associations

Several conditions are known to be associated with patella alta, including:

idiopathic retropatellar pain
recurrent dislocation of the patella
chondromalacia patellae
knee joint effusion

Patella alta may also occur as a result of spastic cerebral palsy .

Radiographic features

On sagittal images, it is usually considered when the Insall-Salvati ratio is greater than 1.3-1.5 .

On radiography, it is important that standard positioning is used, with the knee flexed at 30 degrees. An off-angle x-ray beam or non-standard positioning may result in a spuriously abnormal ratio.