Blackthorn injury: a report of three interesting cases.

Blackthorn (Prunus spinosus), a member of Rosacea family is well known for causing infections and tissue reactions of synovial structures. Three interesting cases of cystic blackthorn granuloma, blackthorn synovitis with digital nerve entrapment, and multiple blackthorn syndrome are presented. Removal of foreign body fragments and surrounding reactive tissues resulted in an uneventful recovery with full return of joint and tendon functions.