Patellofemoral pain syndrome: evaluation of location and intensity of pain and it's clinical implication.

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To identify the sites and intensity of pain in patients with patellofemoral pain syndrome Gerbino PG et al did a study. This study was conducted at an academic sports medicine practice in Boston, Massachusetts.

A single sports medicine orthopaedic surgeon examined a consecutive sample of patients with patellofemoral pain not explained by one of several well-defined anterior knee pain diagnoses. The study group consisted of 100 patients (75 females, 25 males) with median age of 14 years.

Patients reported intensity of pain using a 0- to 9-point ordinal scale.
Following are the findings on sites of pain, pain intensity etc:
1. The most common site of pain was the patella during anterior-posterior compression (90 patients), followed by the distal pole of the patella, the medial plica, and the nonarticular medial femoral condyle.
2. Median "worst pain" intensity was 6 out of a possible 9.
3. The most common site of "worst pain" was also the patella in compression (63 patients).
4. Median duration of symptoms was 10 months, with an interquartile range of 3 to 20 months. Pain intensity was inversely correlated with duration of symptoms.
Significance and implications of these findings:
In these patients with patellofemoral pain syndrome, the major source of pain was the patella subchondral bone.

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