title: Distribution of hip pain in osteoarthritis patients secondary to developmental dysplasia of the hip.
abstract: OBJECTIVE
  Our aim was to clarify the distribution of hip pain in patients with osteoarthritis of the hip secondary to developmental dysplasia of the hip (DDH).
  
  
  METHODS
  We retrospectively studied 443 hips in 369 patients with osteoarthritis secondary to DDH; mean age was 61 years, and follow-up rate was 84 %. Hip pain was defined as preoperative pain that was relieved 3 months after total hip arthroplasty.
  
  
  RESULTS
  Distribution of pain originating in the hip was 89 % (393 hips) to the groin, 38 % (170 hips) to the buttock, 33 % (144 hips) to the anterior thigh, 29 % (130 hips) to the knee, 27 % (118 hips) to the greater trochanter, 17 % (76 hips) to the low back, and 8 % (34 hips) to the lower leg. When the groin, buttock, and greater trochanter were combined as the hip region, 95 % (421 hips) of pain was located in the hip region. On the other hand, when the anterior thigh, knee, lower leg, and low back were combined as the referral region, 55 % (242 hips) showed referred pain.
  
  
  CONCLUSIONS
  We suggest that rheumatologists be aware of hip disease masquerading as knee pain or low back pain.
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, Chiba, 260-8677, Japan. njonedr@yahoo.co.jp
authors.forename: Junichi
authors.initials: J
authors.lastname: Nakamura
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Oinuma
authors.forename: Seiji
authors.initials: S
authors.lastname: Ohtori
authors.forename: Atsuya
authors.initials: A
authors.lastname: Watanabe
authors.forename: Tomonori
authors.initials: T
authors.lastname: Shigemura
authors.forename: Takahisa
authors.initials: T
authors.lastname: Sasho
authors.forename: Masahiko
authors.initials: M
authors.lastname: Saito
authors.forename: Masahiko
authors.initials: M
authors.lastname: Suzuki
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Takahashi
authors.forename: Shunji
authors.initials: S
authors.lastname: Kishida
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003937:Diagnosis, Differential; D005260:Female; D006615:Hip / Q000503:physiopathology; D006618:Hip Dislocation, Congenital / Q000150:complications / Q000503:physiopathology*; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology; D017116:Low Back Pain / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology*; D010146:Pain / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology*; D010147:Pain Measurement; D011859:Radiography; D012189:Retrospective Studies