{
  "abstract": "Quadrilateral space syndrome (QSS) is an uncommon cause of posterior shoulder pain and deltoid weakness, most often related to axillary nerve compression. We report a young adult male who presented with persistent pain and weakness of the right shoulder following trauma. Examination revealed deltoid atrophy and loss of abduction strength. MRI demonstrated a large inferior paralabral cyst compressing the quadrilateral space, while electromyography confirmed axillary nerve involvement. Initial management with arthroscopic labral repair and cyst decompression provided partial relief; however, persistent neurological deficit required secondary open quadrilateral space decompression. The patient achieved complete recovery of range of motion and deltoid strength, with no cyst recurrence at the 2.5-year follow-up. This case underscores the importance of considering QSS in patients with unexplained posterior shoulder pain and weakness, highlights paralabral cysts as a rare but treatable cause, and demonstrates the value of staged management and long-term follow-up in preventing chronic axillary neuropathy.",
  "authors": [
    {
      "affiliations": [
        "Orthopaedics, All India Institute of Medical Sciences Jodphur, Jodhpur, Rajasthan, India"
      ],
      "name": "Nitesh Gahlot"
    },
    {
      "affiliations": [
        "Orthopaedics, All India Institute of Medical Sciences Jodphur, Jodhpur, Rajasthan, India"
      ],
      "name": "Manveer Singh"
    },
    {
      "affiliations": [
        "Orthopaedics, All India Institute of Medical Sciences Jodphur, Jodhpur, Rajasthan, India"
      ],
      "name": "Rajesh Kumar Rajnish"
    }
  ],
  "title": "Complete deltoid muscle paralysis due to post-traumatic para-labral cyst, an unusual cause of quadrilateral space syndrome",
  "uid": "8f80e97c-f119-58d8-a854-f61998daebf1"
}