| Study | Reason for exclusion |
|---|---|
| Aix‐les‐Bains 1980 | No control group |
| Lehmann 1954 | Periarthritis post‐trauma, fractures, sclerosis |
| Marks 1997 | No control group |
| Oosterveld a 1994 | Literature review |
| Oosterveld b 1994 | Mixed population |
| Pegg 1969 | No control group |
| Walker 1991 | Mixed population |
| Weinberger 1988 | Literature review |
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