Patellofemoral Joint Loading During Stair Ambulation in People With Patellofemoral Osteoarthritis
Article first published online: 26 JUL 2013
Copyright © 2013 by the American College of Rheumatology
Arthritis & Rheumatism
Volume 65, Issue 8, pages 2059–2069, August 2013
How to Cite
Fok, L. A., Schache, A. G., Crossley, K. M., Lin, Y.-C. and Pandy, M. G. (2013), Patellofemoral Joint Loading During Stair Ambulation in People With Patellofemoral Osteoarthritis. Arthritis & Rheumatism, 65: 2059–2069. doi: 10.1002/art.38025
- Issue published online: 26 JUL 2013
- Article first published online: 26 JUL 2013
- Accepted manuscript online: 5 JUN 2013 09:32AM EST
- Manuscript Accepted: 14 MAY 2013
- Manuscript Received: 31 AUG 2012
- National Health and Medical Research Council of Australia. Grant Number: 508966
- Victorian Endowment for Science, Knowledge and Innovation fellowship
To determine whether people with patellofemoral (PF) joint osteoarthritis (OA) ascend and descend stairs with different PF joint loading, knee joint moments, lower limb kinematics, and muscle forces compared to healthy people.
We recruited 17 participants with isolated PF joint OA, 13 participants with concurrent PF joint OA and tibiofemoral (TF) joint OA, and 21 age-matched controls. Joint kinematics and ground reaction forces were measured while participants ascended and descended stairs at a self-selected speed. Musculoskeletal computer modeling was used to determine lower limb muscle forces and the PF joint reaction force, and these parameters were compared between groups by analysis of variance.
Compared to their healthy counterparts, participants with isolated PF joint OA and participants with concurrent PF and TF joint OA ascended and descended stairs with lower knee extension moments, lower quadriceps muscle forces, lower PF joint reaction forces, and increased anterior pelvic tilt. Participants with OA also ascended stairs with increased hip flexion angles and descended stairs with smaller knee flexion angles and smaller hip abductor muscle forces. No differences were evident between the two groups with OA.
Compared to their healthy counterparts, people with PF joint OA (with or without concurrent TF joint OA) exhibit lower PF joint reaction forces during stair ascent and descent, in conjunction with lower knee extension moments and lower quadriceps muscle forces.