Superior dislocation of the patella is a rare condition. We report a 70-year-old gentleman with his patella lower pole osteophyte interlocked with the anterior femoral condyles after hyperextension. The patella was reduced successfully with proper reduction technique under sedation. The active range of movement ranged from full extension to 120-degree flexion a few minutes after reduction. He walked unaided afterwards. There was no knee problem in two years of follow-up. On reviewing the literature, only 20 cases were reported till year 2007 worldwide and 19 cases could be treated by closed reduction with or without sedation.
Watson-JonesR.Fractures and joint injuries. 5th ed. Baltimore: Williams & Wilkins; 1956: 792–3.
2.
BartlettD.H., GilulaL.A., MurphyW.A.Superior dislocation of the patella fixed by interlocked osteophytes. A case report and review of the literature. J Bone Joint Surg Am1976; 58(6): 883–4.
3.
WimsattM.H., CareyE.J.JrSuperior dislocation of the patella. J Trauma1977; 17(1): 77–80.
4.
SiegelM.G., MacS.S.Superior dislocation of the patella with interlocking osteophytes. J Trauma1982; 22(3): 253–4.
5.
HanspalR.S.Superior dislocation of the patella. Injury1985; 16(7): 487–8.
6.
FridenT.A case of superior dislocation of the patella. Acta Orthop Scand1987; 58(4): 429–30.
7.
TeuscherD.D., GoletzT.H.Recurrent atraumatic superior dislocation of the patella: case report and review of the literature. Arthroscopy1992; 8(4): 541–3.
8.
RaoJ.P., MeeseM.A.Irreducible superior dislocation of the patella requiring open reduction. Am J Orthop1997; 26(7): 486–8.
9.
TakaiS., YoshinoN., HirasawaY.Arthroscopic treatment of voluntary superior dislocation of the patella. Arthroscopy1998; 14(7): 753–6.
10.
ScottS.J., MolloyA., HarveyR.A.Superior dislocation of the patella–a rare but important differential diagnosis of acute knee pain–a case report and review of the literature. Injury2000; 31(7): 543–5.
11.
McWilliamsT.G., BinnsM.S.A locked knee in extension: a complication of a degenerate knee with patella alta. J Bone Joint Surg Br2000; 82(6): 890.
12.
BassiR.S., KumarB.A.Superior dislocation of the patella; a case report and review of the literature. Emerg Med J2003; 20(1): 97–8.
13.
YipD.K., WongJ.W., SunL.K., WongN.M., ChanC.W., LauP.Y.The management of superior dislocation of the patella with interlocking osteophytes–an update on a rare problem. J Orthop Surg (Hong Kong)2004; 12(2): 253–7.
14.
JosephG., DevaliaK., KantamK., ShaathN.M.Superior dislocation of the patella. Case report and review of literature. Acta Orthop Belg2005; 71(3): 369–71.
15.
OfluogluO., YasminD., DonthineniR., YildizM.Superior dislocation of the patella with early onset patellofemoral arthritis: a case report and literature review. Knee Surg Sports Traumatol Arthrosc2006; 14(4): 350–5.
