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Patellar forces during isokinetic knee extension.

R Nisell¹, M Ericson

¹Kinesiology Research Group, Department of Anatomy, Karolinska Institute and Hospital, Stockholm, Sweden; Kinesiology Research Group, Department of Rehabilitation, Karolinska Institute and Hospital, Stockholm, Sweden.

Clinical Biomechanics (Bristol, Avon)

|August 7, 2013

Summary

This summary is machine-generated.

Maximum effort knee extensions generate high patellofemoral forces, exceeding those in daily activities. These forces, particularly compressive and suprapatellar tendon forces, are significant during isokinetic exercises.

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Area of Science:

Biomechanics
Orthopedics
Sports Medicine

Background:

The patellofemoral joint experiences substantial forces during dynamic activities.
Understanding these forces is crucial for injury prevention and rehabilitation.

Purpose of the Study:

To quantify patellofemoral joint forces during maximal effort isokinetic knee extensions.
To compare these forces with those generated during other common activities.

Main Methods:

Eight healthy males performed maximal isokinetic knee extensions at 30°/s and 180°/s.
A planar biomechanical model analyzed sagittal plane patellar forces.
Forces were measured in bodyweights.

Main Results:

At 30°/s, patellofemoral compressive and suprapatellar tendon forces reached ~12 bodyweights.
At 180°/s, forces were lower, with compressive and suprapatellar tendon forces at ~7.5 bodyweights.
Force peaks occurred between 65°-75° knee flexion and were strength-dependent.

Conclusions:

Isokinetic knee extensions generate considerably higher patellar forces than walking, jogging, or cycling.
These findings highlight the high joint loading during maximal effort knee extension exercises.