Purpose: Medium term functional outcomeevaluation of Diffuse type PVNS of the knee managed with open synovectomy
Method:  A retrospective study of series of 5 cases of Diffuse type PVNS of the knee was conducted and the outcomes assessed using the Lysholm Score.
Result: Excellent or good outcome was obtained in 4 out of 5 patients, and fair outcome was attained in one patient, who had recurrence  at 14 months postoperatively.
Conclusion: Total synovectomy provides good functional results at medium term follow up and can be used as an effective treatment for diffuse PVNS knee.