Association between anatomical features and anterior knee pain in a "fit" service population.

Anterior knee pain and overuse sports type injuries have been associated with anatomical factors. Specific diagnosis in knee pain is difficult, most service patients are grouped together as "Patello-Femoral Stress Syndrome". Knee pain incidence within the service population is unknown, but thought to be greater than those presenting to General Practitioners. 293 active duty service men (100 Army and 193 Royal Navy) were interviewed and examined in relation to their knees. 138 measurements were made on each subject. 118 admitted to knee problems. Six had specific diagnoses, ranging from patellar tendonitis to ACL deficiency (with marked anterior instability). The remaining 112 individuals formed the study group and examination findings were compared with the 175 without Patello-Femoral Stress Syndrome. The results have been analysed to determine normal ranges and predictors of knee pain. Age, years in the military and results of patello-femoral compression tests were consistently significantly different between the groups. This survey provides useful information on normal values at examination. Q angle measurement was a poor predictor of knee pain. There was no clinically detectable anatomical variant that correlated with the Patello-Femoral Stress Syndrome. There was poor correlation between Tegner activity score and the perceived limitation on sport or work, as assessed on a visual analogue scale.