Patellofemoral Osteoarthritis Assessment and Management

Patellofemoral osteoarthritis is a degenerative condition affecting the joint between the kneecap and femur, characterised by cartilage breakdown, subchondral bone changes and pain during activities such as stair negotiation and squatting. Assessment typically combines clinical examination—focusing on crepitus, pain on patellar compression and quadriceps strength—with imaging modalities including weight-bearing radiographs and magnetic resonance imaging to evaluate cartilage loss, osteophyte formation and bone marrow lesions. Recent advances have employed three-dimensional shape modelling and machine learning to refine detection of early joint alterations and stratify risk. Management encompasses non-pharmacological strategies (exercise therapy, bracing, weight management) and pharmacological interventions (analgesics, intra-articular injections) tailored to symptom severity and structural findings. Conservative care aims to restore muscle balance, correct malalignment and reduce joint load, while emerging surgical options target focal cartilage defects or involve realignment procedures. A comprehensive approach integrates patient education, biomechanical assessment and iterative monitoring to delay progression and optimise function.

Research from Nature Portfolio

Recent studies have used three-dimensional magnetic resonance imaging in asymptomatic adults to map the frequency, location and progression of patellar cartilage defects. High-resolution 3D reconstructions of the patellofemoral joint revealed that cartilage loss occurs predominantly along the ridges of the trochlear groove, with medial lesions more common than lateral ones. These findings establish normative data on subclinical defect prevalence and suggest that early morphological changes can be detected non-invasively, offering a potential window for preventative interventions.

Patellofemoral Osteoarthritis Assessment and Management publication trend

The graph below shows the total number of articles in patellofemoral osteoarthritis assessment and management across all publications each year (not limited to Nature Index journals).

Technical terms

Patellofemoral joint: The articulation between the patella (kneecap) and the femoral trochlea, responsible for distributing load during knee motion.

Osteoarthritis: A chronic joint disorder characterised by cartilage deterioration, subchondral bone remodelling and variable synovial inflammation.

Bone marrow lesion: An area of increased signal intensity on magnetic resonance imaging indicating subchondral bone oedema, microfracture or inflammation.

Magnetic resonance imaging (MRI): A non-invasive imaging technique using magnetic fields and radiofrequency pulses to visualise soft tissue and bone structures.

Convolutional neural network (CNN): A class of deep learning model designed to process and analyse image data by learning hierarchical feature representations.

References

1. 3D patellar shape is associated with radiological and clinical signs of patellofemoral osteoarthritis. Osteoarthritis and Cartilage (2023).
2. Morphological analysis of three-dimensional MR images of patellofemoral joints in asymptomatic subjects. Scientific Reports (2023).
3. A randomised trial of a brace for patellofemoral osteoarthritis targeting knee pain and bone marrow lesions. Annals of the Rheumatic Diseases (2015).
4. Clinical features of symptomatic patellofemoral joint osteoarthritis. Arthritis Research & Therapy (2012).
5. Automated detection of patellofemoral osteoarthritis from knee lateral view radiographs using deep learning: data from the Multicenter Osteoarthritis Study (MOST). Osteoarthritis and Cartilage (2021).