Reasons for Exclusion
| Study | Reason for exclusion |
| Alexander R 2002 | No analysis of THR subgroup |
| Anderson SK 1991 | No analysis of THR subgroup |
| Atanassoff PG 2000 | No analysis of THR subgroup |
| Bachmann M 1997 | No analysis of THR subgroup |
| Beattie WS 1997 | Analgesic data reported in earlier publication (Etches RC 1995) |
| Boeckstyns MEH 1992 | No analysis of THR subgroup |
| Bogoch ER 2002 | No analysis of THR subgroup |
| Clarke PM 1997 | Letter |
| Colwell CW Jr 1995 | No analysis of THR subgroup |
| Daltroy LH 1998 | No analysis of THR subgroup |
| de Miguel RC 1997 | No analysis of primary THR subgroup |
| Drakeford MK 1991 | No analysis of THR subgroup |
| Etches RC 1995 | No analysis of THR subgroup |
| Flory DA 2001 | No analysis of THR subgroup |
| Forst J 1999 | No analysis of THR subgroup |
| Galasko CSB 1985 | No analysis of primary THR subgroup |
| Ganapathy S 1997 | No analysis of THR subgroup |
| Gao F 1995 | No analysis of THR subgroup |
| Herrick IA 1996 | No analysis of THR subgroup |
| Holmstrom B 1993 | No VAS pain assessment |
| Hommeril J-L 1994 | No analysis of THR subgroup |
| Johansson S 1989 | No analysis of THR subgroup |
| Jones MJT 1990 | No analysis of THR subgroup |
| Kampe S 1999 | Not double-blinded |
| Kilickan L 2000 | Not investigator- or patient-blinded |
| Klimscha W 1995 | No VAS pain assessment |
| Kostamovaara PA 1996 | No analysis of THR subgroup |
| McNamee DA 2001 | No VAS pain assessment |
| Modig J 1981 | No VAS pain assessment |
| Murdoch JAC 2002 | No analysis of THR subgroup |
| Niemi L 1993 | No analysis of primary THR subgroup |
| Niemi L 1994 | No analysis of primary THR subgroup |
| Niemi L 1996 | No analysis of THR subgroup |
| Pico L 2000 | No VAS pain assessment |
| Porter EJB 1983 | No VAS pain assessment |
| Prieto-A P 2002 | No analysis of THR subgroup |
| Racle JP 1987 | No VAS pain assessment |
| Rathmell JP 2003 | No VAS pain assessment |
| Reay BA 1989 | No analysis of THR subgroup |
| Reiz S 1981 | Inter-group stats not done |
| Segstro R 1990 | Abstract |
| Sharrock NE 1994 | No VAS pain assessment |
| Smythe MA 1996 | No analysis of primary THR subgroup |
| Tarradell R 1996 | No analysis of THR subgroup |
| Tsueda K 1998 | No analysis of THR subgroup |
| Turner G 1996 | No analysis of THR subgroup |
| Uhrbrand B 1992 | No VAS pain assessment |
| Van Gessel EF 1992 | No VAS pain assessment |
| Vercauteren MP 1998 | No analysis of THR subgroup |
| Ward M 2002 | No analysis of THR subgroup |
| Weller R 1991 | No analysis of THR subgroup |
| Wilder-Smith CH 1994 | No analysis of THR subgroup |
| Wolff AP 1995 | No VAS pain assessment |
| Zhou TJ 2001 | No analysis of THR subgroup |
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