Aim. To review the natural history of upper limb osteochondromas and assess their functional effect. Materials. We performed a retrospective casenote review of a consecutive patient cohort presenting between 1997–2012 with upper limb osteochondromas. Indications for surgical intervention were noted and considered to be cosmetic, functional (including pain relief) and ‘prophylactic’ in terms of deformity prevention. All patients were invited to complete questionnaires for the PODCI, DASH, OSS and MHS scores. Results. We identified 102 patients (62 male: 40 female; mean age = 13.3 years; range 3–31 years). 84 patients had multiple exostoses whilst 18 had a solitary lesion. 52 patients had shoulder girdle involvement (scapula, clavicle and proximal humerus), 51 forearm (Masada I (n=31) Masada II (n=9) Masada III (n=11)), and 38 hand involvement. 46/102 patients had concurrent lower limb lesions. 56 operative procedures were performed primarily for functional benefit. Shoulder girdle procedures (n=21) improved pressure related pain, scapular pseudowinging/dyskinesia and cuff impingement. Forearm procedures (n=35) were performed for functional and prophylactic reasons and involved excision with ulnar lengthening and radial deformity correction (n=15, Masada I), realignment osteotomy or radial head excision for subluxation (n=7, Masada II) and excision with internal fixation of concomitant osteotomy (n=13, Masada I/III). No hand surgery was performed. Radial head dislocations are associated with large ulnar lesions causing shortening > 0.15 total ulnar length. Osteochondromas of the upper limb are generally well tolerated: functional effects were most commonly present in lesions involving the forearm but significant patient benefit was noted following shoulder girdle procedures. The scoring systems used failed to discriminate well between the various procedures used and the perceived benefit. Conclusion:. Patient outcomes are related to surgical indications. Currently available PROMs are either inappropriate Qs (DASH) and/or non-validated (OSS, MHS) and/or non-specific (PODCI*) only 8 parameters for the upper extremity. Better-validated measures may be required. Level of evidence: IV